Home

A20-OLINUXINO-LIME2 and A20-OLINUXINO-LIME2-4GB

1. eg 392 C ME SETS NES S SHIELD C146 R58 Re9 His 10k 6 8k 1 a Iset 6800 Rs E amp Iset 1 0mA a Qi E 5 Ute 1 FB0805 600R 2R 1 esas Bp 27 210 Hen mr amp 8 UDP2 3 9 c1se R62 R 3 SS o dioi S 10k 13k 1 10uF 6 37 6800 Rs Iset 523 USB_A_UERTICAL There are two USB host connector featured on the board They are called USB_HOST1 and USB_HOST2 Each of them has own connector both situated near the Ethernet connector Each of connector has own low loss power distribution switch SY6280 which protects the board in case the devices you have plugged to the board try to draw more current than 523mA combined The maximum current available on each of the USB hosts is exactly 523mA The SY6280 responsible for the USB_HOST1 is enabled by USBO DRV 1 processor pin A4 The SY6280 responsible for the USB HOST is enabled by USBO DRV2 processor pin A5 USB HOST connectors Pin 4 POWER CIRCUIT Pin 4 GND POWER CIRCUIT The GND is common for both levels of the USB HOST Page 30 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 6 6 Gigabit Ethernet The LAN connectivity is handled by Realtek s RTL8211E RTL8211CL in hardware revisions prior to revision G It is capable of transmission rate up to 1Gbps over industry standard CAT 5
2. CMD DI USS UDD CLK SCLK purs So ow es CL470nH 0805 0 3R 250mfi SDO DET MICRO SD MMC NEHTF C WPAPR 8 This slot is typically used for booting the OS due to the larger capacities of the microSD cards compared to SD or MMC cards It is suggested to have an SD card with a proper Linux Android image especially if you have ordered a version of the board without NAND memory It is also recommended to use Class 10 10MByte sec card for faster read write operations lower class cards especially higher capacity ones might slow down the whole system SD MMC connector po 8H7MC connector OO O Additionally there are the WP and CP switches that are responsible respectively for sensing whether the card is locked for reading and whether there is a card inserted Page 27 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 6 3 PWR jack The power jack used is the typical DC barrel jack one used by Olimex 2 1x6 3x9 2mm in most of our products More information about the exact component might be found here https www olimex com wiki PWRJACK You should provide 5 volts direct current and the required current may vary depending on the peripherals connected to the board The power supply you use should be capable of providing at least 1A of current More info about the power supply can be found in chapter 5 of this manual 6 4 USB_OTG The main way o
3. A general advice for easier use of the microphone headphone and interfaces of A20 OLinuXino LIME2 is to take a look at the schematics of another board with those interfaces already installed For example those are present in A20 OLinuXino MICRO Inspect the schematic carefully The signal layout is described on the next page Page 34 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual GPIO 1 connector cmo ap v cium 4 spe pe 3m jn E pa pe 1 Signals marked with are multiplexed with either a peripheral device or another connector Ensure that the multiplexing is handled properly on software and or hardware level else there would probably occur wrong levels loss of data etc Pin 29 is used to control the power supply available at the 5 SATA PWR by default Page 35 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 6 9 2 GPIO 2 General Purpose Input Output 40pin connector The GPIO pins are led out on a separate 40 connecter They allow the user to attach additional hardware check readings or perform hardware debug The GPIO 2 connector numbers are printed at the bottom of the board for your convenience GPIO 2 connector Jg p Oo UJ N I 5 lt EY D Pin Signal name 1 5V 3 3V Processor pint POWER CIRCUIT POWER CIRCUIT 15 TWIO SDA B15 IO 20 11 PI1 20 13 PI2
4. The default Debian setup is made with settings for HDMI 720p 60Hz If you want to change some other LCD VGA or HDMI resolution then you have to start script file in root directory If the problem is under Debian Linux make sure you are properly logged in the XFCE interface Else applying calibration would not happen for the current user if you are calibrating from the X graphical interface make sure that you are logged as user olimex if calibrating without the X the user is root su olimex enter the password olimex calibrate the touch screen and reboot the board sudo reboot 2 8 GPIO under Debian You can read data from a given GPIO port The logical ranges are usually as follows 0V 1V for LOW or 0 2 4V 3 3V for HIGH or 1 All voltages are measured against ground GND If the input signal is to high you will at least destroy the port The algorithms for writing a value to a GPIO port and reading such a value are pretty similar The usage of GPIO ports follows the algorithm we would use GPIO 49 for demonstration purposes 1 Export GPIO 49 echo 49 gt sys class gpio export Note that you can export GPIOs in range with for in seq 1 1 230 do echo i gt sys class gpio export done 2 Set input output GPIO 49 2 1 Set input echo in sys class gpio gpio49 ph9 direction 2 2 Set output echo out sys class gpio gpio49 ph9 direction Page 18 of 51 OLIMEXO 2017 A20 OLinuXino
5. 1 PHY changed to RTL8211E VB CG1 2 Rx pullups moved before the serial matrix for better routing 1 Added four mount holes 3 3mm like on A20 olinuXino Micro connected to GND odd milling shape changed to rectangular G released 2 R109 change from 47k 0402 to 470k 0402 R107 changed from 470k 0402 to capacitor 220nF 0402 because new PHY consumes too much current at startup 8 3 Useful web links and purchase codes The web page you can visit for more information about your device are Product page https www olimex com Products OLinuXino A20 A20 OLinuXino LIME2 Wiki article of the board https www olimex com wiki A20 OLinuXino LIME2 A place for general questions FAQ or friendly talk https www olimex com forun You can get the latest updates on the software at https github com OLIMEX OLINUXINO You may may join our IRC channel Zolimex 2 freenode net http webchat freenode net channels olimex The sunxi community is behind the Allwinner Linux support http linux sunxi org Main Page ORDER CODES A20 OLinuXino LIME2 base version of the board with no extra flash A20 OLinuXino LIME2 e4GB the product for which this manual is about A20 OLinuXino LIME2 n4GB the product for which this manual is about A20 OLinuXino LIME2 n8GB the product for which this manual is about USB SERIAL CABLE F USB serial console cable female USB MINI CABLE standard USB type A to USB type mini cable SY0605E r
6. 9 15 PI3 9 17 14 8 19 PI5 8 21 PI6 7 I7 17 I8 16 PI9 16 15 15 4 Processor POWER CIRCUIT Goes to AXP209 E23 E22 D23 D22 2 2 2 2 2 A22 B21 A21 E13 E14 014 1 1 17 Signals marked with multiplexed with either a peripheral device or another connector Ensure that the multiplexing is handled properly on software and or hardware level else there would probably occur wrong levels loss of data etc gt UU 7 UU 4 H 1 Uu e UU gt 00 He C UJ N e N gt UJ UJ He UJ 0 UJ 0 UU gt 27 gt 00 31 PI11 UJ HB A v v v v v v v v PIPE o ul 37 14 He m v v v H H aimo He UJ Page 36 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 6 9 3 GPIO 3 General Purpose Input Output 40pin connector GPIO 3 connector ND POWER CIRCUIT Pin Signal name Processor POWER CIRCUIT POWER CIRCUIT c PB3 PB4 PB5 PB6 PB7 O BRIO P 10 12 14 PB8 SATA PWR EN 16 PB9 18 PB10 PB11 p gt gt RIN vs gt wo os N PB13 PB14 PB15 PB16 PB17 PH24 PH25 PH26 PH27 olololo o 6 9 4 GPIO 4 Gener
7. LIME boards are a special kind of OLinuXino boards they are as small as possible while maintaining a remarkable stand alone functionality The strong points of these boards are the processor speed the small form factor and the low price to productivity ratio Customers have full access to the technical documentation of the board The software is released under General Purpose License and the board is considered open hardware all schematics and board design files are available to the customer under the Creative Commons Attribution ShareAlike 3 0 Unported License 1 3 Board variants The board has four major board variants The difference in the suffix is based on the type and volume of extra flash memory installed on the board The base version of the board that comes with NO extra flash memory is named A20 OLinuXino LIME2 These three variants with extra flash memory are named A20 OLinuXino LIME2 e4GB A20 OLinuXino n4GB and A20 OLinuXino LIME2 n8GB The name consists of the type of the memory and the size of the memory suffix e4GB stands for eMMC type of flash with 4GB of size n4GB stands for NAND type of flash with 4GB of size The e4GB version comes with 4GB eMMC flash memory that expands the on board storage available and also allows booting the operating system without the need of a SD card The eMMC memory comes blank you would have to upload desired operating system to the eMMC memory Exactly the same is the case with th
8. LIME2 user s manual 3 Set value or read value GPIO 49 3 1 Set value echo 0 sys class gpio gpio49 ph9 value echo 1 gt sys class gpio gpio49 ph9 value 3 2 Read input cat sys class gpio gpio49 ph9 value 4 Unexport GPIO 49 when finished echo 49 sys class gpio unexport A helpful document on A20 s GPIO usage might be found here http www py6zgp com download A20 GPIO pdf the document was created by Dr Guido Pelz Alternatively you might also use the Python script mentioned in the next chapter 2 9 I2C and SPI under Debian I2C and SPI are both supported in the latest Debian releases There is a python module called pyA20Lime2 which also might be found here https pypi python org pypi pyA20Lime2 At the same web address you would also find information on how the library is used 2 10 Software support We maintain Linux and Android images for SD card which might be downloaded for free and modified as the user wishes The latest images and updates are featured at the wiki article of the device https www olimex com wiki A20 OLinuXino LIME2 We usually try to provide details on how to build the Linux and the Android images at our GitHib page https github com OLIMEX OLINUXINO tree master SOF TWARE A20 Another useful place is the Olimex forums where a lot of people share their experience and advice https www olimex com forum The official images are a constant work in progress newer releases are pa
9. TV and the board it is a good idea to have them both connected to the same electrical source to the same utility power socket This might be said for a serial cable connected between a PC and the board s DEBUG port In rare cases different polarity might cause hardware damage to the board 2 2 Requirements In order to set up the A20 OLinuXino LIME2 optimally one or more additional items may be used They might be generally placed in three categories Required items that are needed in order to achieve minimum functionality Recommended items that is good to have in order to be able to interact with the most important of the features of the board Additional items that provide access to additional features or expand the features of the board Required items USB type A to USB mini cable to connect to a personal computer used for powering the board and uploading new Android image to the NAND memory if your board has 4GB NAND can also be used to access the Linux of the board Input device either a mouse keyboard or touchscreen LCD Output device either HDMI cable native HDMI monitor screen projector or USB SERIAL CABLE F personal computer for Linux and or Android debugging SD card with compatible image if you have the board version with NO additional NAND memory you will need it to use one of the images available Recommended items External USB hub to split the USB HOST mounted on the board
10. The processor The features of the A20 processor according to the manufacturer Allwinner CPU ARM Cortex A7 Dual Core GPU ARM Mali400MP2 Complies with OpenGL ES 2 0 1 1 VIDEO HD H 264 2160p video decoding Multi format FHD video decoding including Mpeg1 2 Mpeg4 SP ASP GMC H 263 H 264 VP6 8 AVS jizun Jpeg Mjpeg etc H 264 High Profile 1080p 230fps or 720p 60fps encoding 3840x1080 30fps 3D decoding BD SBS TAB FP supported Complies with RTSP HTTP HLS RTMP MMS streaming media protocols DISPLAY Supports multi channel HD display Integrated HDMI 1 4 transmitter with HDCP support CPU RGB LVDS LCD interface Supports CVBS YPbPr VGA Integrated TV decoder CAMERA Integrated parallel 8 bit I F YUV sensor Integrated 24 bit parallel YUV 444 I F Supports 5M CMOS sensor Supports dual sensors AUDIO Integrated HI FI 100dB Audio Codec Dual analog mic amplifiers More information can be found on Allwinner s web site at the following web address http www allwinnertech com en product A20 html A good source of information on the processor is the linux sunxi wiki article http linux sunxi org A20 Page 23 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 4 2 Block diagram The block diagram is taken from Allwinner s web site Audio Codec ARM Cortex A7 Thumb 2 FPU Camera curit stem Se Syste ARM Cortex A7 NEON SIMO interface User Interface GPU Video Engine Keypad RTP
11. UTP cable with BER less than 10 10 in 1000Base T The controller is compatible with some of the major industry standards It complies with 1000Base T IEEE 802 3ab 100Base TX IEEE 802 3u 10Base T IEEE 802 3 and IEEE 802 3 RGMII among others The Ethernet connector is grounded according to the standard check GND1 and GND2 lines on the schematics If you use Linux then the Ethernet connector might be used for SSH connection to the board If you lack any other option for debugging it might be hard to guess the correct IP of the board since it has DHCP enabled by default especially if you are in a large network It is good idea to check the default settings by exploring the Linux image settings Those are usually stored in etc network interfaces For DHCP you need to enable auto detection and dhcp as shown below auto ethO iface eth inet dhcp For setting a static address please follow the pattern below auto iface eth inet static address 192 168 1 5 netmask 255 255 255 0 gateway 192 168 1 254 The EEPROM memory may be used to store the MAC address Important In some Debian images it is possible that the Ethernet doesn t get auto detected during boot up This is done on purpose because if there is auto detection enabled and you don t want to use the Ethernet connector or you have forgotten to plug a cable the start up would be greatly delayed This might be problem in the first start up to users counting only on SSH con
12. compatible with LIME2 6 The price tag Due to the hardware differences listed above the Linux and Android distributions of the LIME2 and LIME boards are not identical Furthermore some of the hardware extensions are not compatible with both of the designs For example the A10 OLINUXINO LIME UEXT is not compatible with A20 OLinuXino LIME2 board 1 4 Board version used in the manual Revision B boards and resources were used while writing this document It is possible that they are outdated so it is always recommended to download the latest sources from the GitHub page of the board https github com OLIMEX OLINU XINO tree master HARDWARE Some peripherals documents or software may be suitable for both the A20 LIME2 and the A20 LIME designs but it is generally advised to use resources for the specific board Page 7 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 1 5 Document organization Each section in this document covers a separate topic organized as follows Chapter 1 is an overview of the board usage and features Chapter 2 provides a guide for quickly setting up the board and software notes Chapter 3 contains the general board diagram and layout Chapter 4 describes the component that is the heart of the board the A20 Allwinner processor Chapter 5 is an explanation of the control circuitry associated with the processor Chapter 6 covers the connector pinout peripherals and jumper description Chapter 7 provi
13. of the cable GREEN wire should go to TX line of the target board the TX line of the cable RED wire should go to the RX line of the target board The BLUE wire should go to the target s GND line UARTO 7 6 2 MicroSD card connector The micro SD card slot is primarily used for booting the operating system The board works with micro SDHC cards up to 32GB of storage As a general precaution be careful with the SD cards you purchase There is a big percentage of fake cards due to the low effort required to counterfeit popular brands and the big demand for SD cards worldwide When in doubt try the same operation with another card from another brand Olimex sells microSD cards with Linux or Android images that have been tested please refer to chapter 2 2 Requirements Of course if you already have a large enough microSD card you can download the official Linux image from the wiki pages https www olimex com wiki A20 OLinuXino LIME2 When removing the card please make sure that you release it from the connector by pushing and NOT by pulling the card directly this can damage both the connector and the microSD card 6 2 1 SD MMCI slot The schematic related to the SD MMC microSD connector is located on the top of the board and the Page 26 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual schematic shown below MicroSD R41 _ 1 1 S58 D3 SD MMC SUB CHU 5
14. only on certain variants of the board SATA connector with 5V SATA power jack Native HDMI interface with standard connector Capable of FullHD 1080p video playback 2x USB Low Full High Speed hosts with power control and current limiter USB OTG with power control and current limiter LiPo Battery connector with battery charging capabilities LCD row of pins 0 05 step 160 GPIOs on four GPIO rows of pins 0 05 step MicroSD card connector DEBUG UART connector for console debug with USB SERIAL CABLE F Status LED Battery charge status LED Power LED e 2KB EEPROM for MAC address storage and more 2 BUTTONS with ANDROID functionality RESET button 2 mount holes 5V input power supply noise immune design PCB dimensions 84 x 60 mm 3 3 x 2 4 Page 5 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 1 2 Target market and purpose of the board The boards from the OLinuXino family are easy to setup and powerful It is possible to use them in almost any application as a host board They are suitable for embedded programming enthusiasts Linux and Android gadget fans they can just use the board as a media center or fully functional Linux PC for instance and also professionals since its low cost makes it very good solution for application orientated embedded systems The main usage of the board is software embedded development without the urge of understanding perfectly the hardware The
15. 9 PH7 GPIO jumper controls which of the two ports PB9 or PH7 should be lead out to pin 9 of GPIO3 connector for easier access Changing this jumper also changes the PHZ GPIO signal available at GPIO 3 connector s pin 9 By default this jumper is in PH7_GPIO position and PH7 is lead to pin 9 of GPIO3 Page 40 of 51 PB9 PH7 USB PB9 PH7 GPIO OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 6 12 Additional hardware components The components below are mounted on OLinuXino but are not discussed above They are listed here for completeness Reset button used to reset the board Power button used to reset the board Recovery button used to reset the board 1GB 2x 4Gb 256M x 16b DDR3 SDRAM the exact memory used currently in the board is SAMSUNG K4B4G1646D BCKO In the latest Debian images the DDR3 RAM memory is set at 384MHz which is the most conservative and stable clock for the A20 designs This is the recommended clock for boards in heavy duty designs The lower the RAM clock the greater the stability We recommend performing stability tests in a real environment and decide what value is the most stable in your specific case The value that we use in our default images is 384 just in case somebody uses the board in environments with higher than typical ambient temperature or in applications that stress the memories all the time If you wish to change the clock of the RAM memory you need to rebuild the u b
16. ARM Mali400 IR LRADC ARM Mali400 Display Engine Connectivity System Display interface USB OTG 2 USB HOST _ Interrupt Controller CPU RGB LCD TV Decoder TV Encoder GMAC EMAC SD MMC Timer HS Timer LVDS _ 4 amp SPI S TWI 2 PS2 TS RTC CVBS YPbPr VGA 8 UART PCM 12S AC97 HDMI 1 4 HDCP Page 24 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual CHAPTER 5 CONTROL CIRCUITY 5 Introduction to the chapter Here you can find information about reset circuit and quartz crystals locations the power supply circuit is also briefly discussed 5 1 Reset The board has hardware reset controlled by the AXP209 power system management IC It is a good practice to perform software reset of the board Performing reset by disconnecting the power supply might lead to software corruption of the operating system of choice 5 2 Clocks 25 MHz quartz crystal Q1 is connected to pins X1 and X2 of the RTL8211CL Gigabit Ethernet controller 32 768 Hz RTC quartz crystal Q4 is found at pins F1 and F2 of the A20 microcontroller 24 MHz quartz crystal Q3 is found at pins N22 and N23 of the A20 microcontroller 5 3 Power supply circuit The power supply is handled mainly by AXP209 power management system an Allwinner chip that goes together with the A20 processor It is mounted on the board but since it is relatively hard to find we also sell it separately The power supply circuit of A20 OLinuXino LIME2 requires input
17. CREATE A20 OLINUXINO LIME2 AND A20 OLINUXINO LIME2 4GB THEY ARE CONSIDERED SUITABLE ONLY FOR RESPECTIVELY A20 OLINUXINO LIME2 OR A20 OLINUXINO LIME2 4GB Page 2 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual Table of Contents CHAPTER 2 SETTING UP THE OLINUXINO BOARD eene 9 2 Introduction to the chapter T TERN EM RP 9 25 1 Serial connection at LUABCTU i iiic a 12 2 5 2 HIM MOD CO iio eei o ee torio Lk E Edo Ve ere Lee Uc Per A Ip M P TOS raa e edid 13 2 5 9 ECD ulisplay 5i iios iioi iiec i eo ihe on i e Hi ies ee idi ni iecit 13 2 544 5SH via mini USB cable m Debian icis ic dioe nois io si esd C ca 13 2155 SSH via Ethernet connettOt E a de er ise eei d SU SE EI e 14 2 Cali Dose catus ce0 12 17 ye E A 18 CHAPTER 4 THE ALLWINNER 20 23 nttodicion tothe unici visui Beetles scs bui Dor Ir sae Mode 23 Page 3 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 9 Input O AOpi 6 9 3 GPIO 3 General Purpose Inpu
18. ME2 The board variant without NAND needs an SD card with bootable OS Android or Linux There are ready images available for download at the above linked A20 wiki article To repair the image on NAND re upload it following these easy steps 1 Install and run PhoenixSuit can be found in the wiki article of the board 2 Go to firmware tab of the program and point to a valid Android image the latest official one may also be downloaded from the wiki article 3 Disconnect the power supply and USB cable from the A20 board 4 Press and hold RECOVERY button apply power supply 5V release RECOVERY button 5 Connect USB cable to the mini USB connector 6 You will be asked for drivers for the bootloader Navigate to the folder where you extracted the PhoenixSuit and install the drivers from the respective executables or manually point the installer to the drivers folder in the PhoenixSuit installation path 7 PhoenixSuit will detect the board and would ask for the method of writing the image Choose method of writing the image and confirm your wish to write the image 8 Wait till upgrade succeeds Page 29 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 6 5 USB HOST connectors The part of the schematic related to the USB HOST connectors is listed below C USB AOSTS L4 USB_A_VERTICAL 5 11 Y6280 2 Bur 1 2 cn USB1 DR 41 e UpP1 3l
19. OLIMEXO 2017 A20 OLinuXino LIME2 user s manual The tools for script bin changing are located in the image First convert the binary to text with bin2fex boot script bin boot script fex This will convert script bin file from sdcard to script fex file Then open the file with nano text editor nano boot script fex Edit the file as you want pin assignments etc and save the changes and exit The different options for the script are explained here Please refer to the following web page for more information http linux sunxi org Fex Guide IMPORTANT ADJUSTING SCRIPT BIN WITH IMPROPER VALUES MIGHT BREAK YOUR DEBIAN IMAGE AND IT IS ALWAYS RECOMMENDED TO KEEP A BACK UP OF YOUR DEFAULT SCRIPT BIN When done with editing save the changes exit nano and convert the text file back to binary format with fex2bin tool type fex2bin boot script fex boot script bin Finally reboot the board reboot Reboot the board and the new settings would be applied Alternatively you can do the changes on the microSD card off the board You would need to remove the microSD card and explore it in a microSD card reader You would need to edit the configuration file script bin and edit the settings inside This file is usually located in Script bin can t be opened in the binary format so you would need to convert it to fex file format first There are ready to use tools that convert script bin lt gt script fex Note that script bin fex contains configura
20. OWER LED GPIO 1 GPIO 2 GPIO 3 GPIO 4 AND LCD CON connectors have 0 05 step SU_SATA_PUR 5V_SATA_PWR POWER JACK BARREL 5 00 VDC ONLY 111 111114114 ce pon SATA DRIVE aao Q LIPO BATTERY CONNECTOR Licdesz711 9 C199 Dit past it CONNECTOR mmt USB HOST 1 USB HOST 2 HDMI Cit C2419 NES oO t GIGABIT ETHERNET RI45 JACK USB OTG 4GB NAND MEMORY LED1 GPIO 1 GPIO 3 UARTO OPTIONAL DEBUG PINS Page 21 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 3 2 Layout bottom view At the bottom are located mainly the buttons and microSD card connector POWER BUTTON LI 452 4 que FR 3 a ccc M 4 mee vt PC37 3 RESET BUTTON 1 A o 92 4 d E ci28 ci e 013 Mu open hardware 1427 eios E Les 4 J RECOVERY BUTTON aig Made in Bulgaria 2014 1 C687 C112 feo bys OUMEX 7 05 d ie MICROSD CARD CONNECTOR ti 2 PB9 PH GPIO TE 5 o Page 22 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual CHAPTER 4 THE ALLWINNER A20 MICROCONTROLLER 4 Introduction to the chapter In this chapter is located the information about the heart of OLinuXino its microcontroller The information is a modified version of the datasheet provided by its manufacturers 4 1
21. SU RI DE Ed 00396197 0119199 OM mmo ELE 1085 Rada ri C109 1 agf HHH OLIMEX COM A20 OLINUXINO LIME2 and A20 OLINUXINO LIME2 AGB Open source sinole board Android Linux mini computer USER S MANUAL Document revision G September 2017 Designed by OLIMEX Ltd 2014 lead free boards produced by Olimex LTD are ROHS compliant OLIMEXO 2017 A20 OLinuXino LIME2 user s manual DISCLAIMER 2017 Olimex Ltd OlimexG logo and combinations thereof are registered trademarks of Olimex Ltd Other product names may be trademarks of others and the rights belong to their respective owners The information in this document is provided in connection with Olimex products No license express or implied or otherwise to any intellectual property right is granted by this document or in connection with the sale of Olimex products This work is licensed under the Creative Commons Attribution ShareAlike 3 0 Unported License To view a copy of this license visit http www creativecommons org licenses by sa 3 0 This hardware design by Olimex LTD is licensed under a Creative Commons Attribution ShareAlike 3 0 Unported License The software is released under GPL It is possible that the pictures in this manual differ from the latest revision of the board The product described in this document is subject to continuous development and improvements particulars of the product and its u
22. Xino LIME2 user s manual 8 5 Product support For product support hardware information and error reports mail to support olimex com All document or hardware feedback is welcome Note that we are primarily a hardware company and our software support is limited Please consider reading the paragraph below about the warranty of Olimex products All goods are checked before they are sent out In the unlikely event that goods are faulty they must be returned to OLIMEX at the address listed on your order invoice OLIMEX will not accept goods that have clearly been used more than the amount needed to evaluate their functionality If the goods are found to be in working condition and the lack of functionality is a result of lack of knowledge on the customers part no refund will be made but the goods will be returned to the user at their expense All returns must be authorized by an RMA Number Email support olimex com for authorization number before shipping back any merchandise Please include your name phone number and order number in your email request Returns for any unaffected development board programmer tools and cables permitted within 7 days from the date of receipt of merchandise After such time all sales are considered final Returns of incorrect ordered items are allowed subject to a 10 restocking fee What is unaffected If you hooked it to power you affected it To be clear this includes items that have been
23. al Purpose Input Output 20pin connector GPIO 4 connector features the rest of the signals available and few additional signals that might need testing Rosen hu sme Ji L wm eum deca sme jw demam jm _ far p cape pe es Signals marked with are multiplexed with either a peripheral device or another connector Ensure that the multiplexing is handled properly on software and or hardware level else there would probably occur wrong levels loss of data etc Page 37 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 6 10 LCD CON 40pin connector The LCD CON pins are led out on a separate 40pin connecter for the ease of connecting an LCD We have tested the ability of the board to interact with such a display They allow the user to attach additional hardware check readings or perform hardware debug The LCD connector is suitable for a number of Olimex displays and touchscreen panels with different native resolution the smallest available is the 4 3 one called LCD OLinuXino 4 3TS with native screen resolution of 480x272 through the 7 one named LCD OLinuXino 7TS with 800x480 to the 1024x600 10 1 LCD OLinuXino 10TS Typically you need a single cable for the connection between the board and the display Important if you have an old
24. ck from 5V USB port via USB connector or from 3 7V Li Po battery via the LIPO BAT Note that the board might consume up to 650mA of current at 5V when there are no peripherals connected to the USB hosts Make sure your power supply is able to provide at least 1A before Depending on your preferred way of powering you might need additional hardware Important Not all USB ports would be able to provide enough power for the board Try using another USB port USB hub or a cable of higher quality If you have an LCD display connected to the board or external 2 5 hard disk then the USB will NOT be sufficient source of power The best practice is to never count on the mini USB OTG as a single source of power for the board The preferred way of powering the board is via the PWR jack with 5V DC This would make the board fully powered and able to power all the peripherals connected to it Note that when powering the board from the USB the current provided might be insufficient to also power a bigger LCD connected to the LCD con However this power option is capable of driving the board when using external display connected to the HDMI connector The typical consumption of A20 OLinuXino LIME 2 is between 400mA and 650mA depending on the current load If the board has entered power down state you can bring it back without restart using BUT The PWR BUT is also used to start the board when powered from a Li Po battery on the ba
25. cked with better hardware support newer kernels and extra features You are more than welcome to send or share your suggestions and ideas at our e mail the public forums or irc channel We would attempt to help in almost every case We listen to the feedback and if the majority of users suggest a software change or update we try to implement such Customer feedback is very important for the overall state of the software support However do not expect full Linux or Android software support We can share our experience We can give you full details for things we have tried We can point you to a resource or a guide We can give you general directions to solving a specific problem or places to look for Page 19 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual more information However we won t install a piece of software for you or write custom program for you We won t provide a specific software solution to a specific software problem Page 20 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual CHAPTER 3 A20 OLINUXINO LIME2 BOARD DESCRIPTION 3 Introduction to the chapter Here you get acquainted with the main parts of the board Note the names used on the board might differ from the names used below to describe them For the actual names check the A20 OLinuXino LIME2 board itself 3 1 Layout top view The picture below shows the top side of the board and highlights the most important parts GPIO 4 GPIO 1 LCD CONNECTOR P
26. des the schematics and the dimensions of the board Chapter 8 contains the revision history useful links and support information Page 8 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual CHAPTER 2 SETTING UP THE OLINUXINO BOARD 2 Introduction to the chapter This section helps you set up the development board for the first time Please consider first the electrostatic warning to avoid damaging the board then discover the hardware and software required to operate the board The procedure to power up the board is given and a description of the default board behavior is detailed 2 1 Electrostatic and electrical polarity warning A20 OLinuXino LIME2 is shipped in a protective anti static package The board must not be exposed to high electrostatic potentials A grounding strap or similar protective device should be worn when handling the board Avoid touching the component pins or any other metallic element Ensure that your development board gets attached to properly working hardware For example it is common for cheap HDMI monitors to lack grounding Avoid TVs which have no grounding on their power supply cable If you can t avoid them try to add the grounding yourself if this is not possible please use USB ISO to save your development board from potential over voltage If you connect other electrical devices to the LIME2 board make sure that they have equal electrical polarity For example when you connect an HDMI cable between a
27. display A13 LCDx xx you need additional adapter board and two different 40PIN ribbon cables to connect an Olimex display and the LCD CON Important the two rows of pins of LCD CON connector on A20 OlinuXino LIME2 swapped compared to A20 OLinuXino LIME and A10 OLinuXino LIME Please note that the smallest display 4 3 480x272 is not suitable for the official Android images we provide Pin Signal name Processor pin Pins Signal Processor pin GND CIRCUIT POWER CIRCUIT 3 3V POWER CIRCUIT LCD_D16 Y1 fa kom fa Lomas Y Loma y Loma Y Y a ima mi p 1 3 7 11 13 15 17 19 21 27 31 37 B 9 B1 C4 2 2 Signals marked with are multiplexed with either a peripheral device or another connector Ensure that the multiplexing is handled properly mm a BEM EN AA22 TPY2 AA23 on software and or hardware level else there would probably occur wrong levels loss of data etc Full list of recommended displays for the board might be found in chapter 2 7 Connecting and calibrating a display Page 38 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual IMPORTANT You need to upload new Android image to the board These images are available here https www olimex com wiki A20 OLinuXino LIME2 using an operating system NAND flash In Debian Linux you would need to start a start a shell script to change
28. e n4GB and n8GB variants The n4GB and n8GB versions come with either 4 or 8GB extra NAND flash memories expands the on board storage available and also allows booting the operating system without the need of a SD card Note that these memories also come blank you would have to upload desired operating system to the NAND memory Currently there is higher demand for boards with eMMC since seem to require less power have longer life corrupt harder Additionally the eMMC memories that we use have an industrial temperature range version Board variant Extra Flash Type of Flash Size of Flash Boot Linux from Flash A20 OLinuXino LIME2 No A20 OLinuXino LIME2 e4GB Yes eMMC 4GB Yes after install script A20 OLinuXino LIME2 n4GB Yes NAND 4GB Yes after install script A20 OLinuXino LIME2 n8GB Yes NAND 8GB Yes after install script Page 6 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual A20 OLinuXino LIME2 looks similar to both A20 OLinuXino LIME and to A10 OLinuXino LIME The major differences between A20 OLinuXino LIME2 and A20 OLinuXino LIME are 1 LIME2 has gigabit Ethernet GbE compared to the standard 100Mb Ethernet of the LIME 2 LIME2 design provides double the RAM memory compared to the LIME design 1024 vs 512 3 Much better routing of DDR3 memory 4 Increased the number of layers from 6 in LIME to 8 in LIME2 5 Corrected pinout of the LCD connector shields for LIME are not
29. ed script bin Double check if all cables are properly connected Also check if there is a change in the behavior if you either twist the cables carefully or press different components at the back If the above doesn t fix the flickering problem edit the script bin parameter lcd io cfg0 make sure that it is set to 0x10000000 1x1 and 7x0 Q How do I write the Linux image to a micro SD card to use with my A20 board A To write a Linux image to an SD card under Windows we use Win32 Disk Imager Download Win32 Disk Imager software Insert card Start program Select file Click write To write a Linux image to an SD card under Linux For instance you have an image with the file name of debian 2g img It would be downloaded to the SD card connected to a Linux machine using one of the following commands dd bs 4M oflag sync if debian 2g img of dev sdX Page 47 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual Or cp debian 2g img dev sdX where X is the uSD card Q How to detect and enable the Ethernet controller if it is disabled by default A You can enable it by following these two steps 1 To check under what name the LAN is associated write ifconfig a 2 If for example it is under ethO name then write dhclient ethO This should enable the Ethernet and then SSH would also be available You can also enable auto detection of Ethernet on power up by removing the comment auto eth0 in etc network int
30. eliable power supply adapter 50Hz EU 5V 1A for A20 OLinuXino LIME2 SY0605E CHINA cheaper power supply adapter 50Hz EU 5V 1A for A20 OLinuXino LIME2 Page 45 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual A20 LIME2 ANDROID SD a tested class 10 micro SD card with the latest by the time of leaving the Olimex facilities official Android release A20 LIME2 DEBIAN SD a tested class 10 micro SD card with the latest by the time of leaving Olimex facilities official Debian Linux release A20 OLinuXino LIME2 UEXT an adapter from 0 05 step connector to 0 1 step one also suitable for LCD adapting LCD OLINUXINO 4 3TS low cost 4 3 LCD display with touchscreen component 480 272 LCD OLINUXINO 7TS low cost 7 LCD display with optional touchscreen component 800x480 LCD OLINUXINO 10TS low cost 10 LCD display with optional touchscreen component 1024x600 LCD OLINUXINO 15 6 low cost 15 6 LCD display 1366x768 LCD OLINUXINO 15 6FHD low cost Full HD 15 6 LCD display 1920x1080 CABLE IDC40 15cm cable for LCD to LCD CON connection SATA HDD 2 5 500GB 500GB 2 5 SATA hard disk SATA CABLE SET cables that allow the connection of a 2 5 hard disk to the board ALUMINIUM HEATSINK 20x20x6MM heatsink radiator for better processor heat dissipation How to purchase You can purchase directly from our online shop at https www olimex com You can purchase from any of our distributors Sometimes it is fas
31. ending on the display chosen and whether you attempt to run Debian Linux or Android additional video settings configuration may be required It is always a good idea to have one of the other connection options available as back up in case the video output settings need modification For more information refer to chapter 2 7 Connecting and calibrating a display 2 5 4 SSH via mini USB cable in Debian The latest official Debian Linux image allows the use the USB connector for SSH connection without the need of a LAN cable or a serial cable You can use a mini USB cable connected between your host PC and the on board mini USB connector For connection convenience there is a DHCP server running specifically for USBO interface The DHCP server should give IP address to the new USBO interface of your host PC so you can make SSH connection from your PC to the default board IP address of the USBO interface 192 168 2 1 You can connect to the board using a mini USB cable and an SSH client if you use Windows you might use puTTY for example at address 192 168 2 1 For Windows operating system upon connection the board should show up in Windows Device Manager as RNDIS Ethernet Gadget You might be asked to install a driver The drivers can be found Page 13 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual online as RNDIS driver Remote Network Driver Interface Specification The drivers are provided by Microsoft and th
32. erfaces in the Linux image Q How to install Android on an SD card A First download one of the official Android images which might be found in the Android section above Make sure that the download link you visit clearly indicates that the image is suitable for the microSD card since there are images suitable for NAND memory also The images suitable for the microSD memory and those suitable for NAND card are different However the upload method is almost identical using PhoenixSuit There are two types of Android images for microSD card that we usually provide and each of them has to be downloaded to a microSD card using a different method The image provided for microSD card is either the native Android image that can be downloaded to the card via a software tool like PhoenixSuit through the board or an image taken from an already prepared microSD card that requires to simply write the image through a microSD card reader It is more likely that you have an Android image that requires a simple copy to a card If that is the case you can follow the exact steps as for Linux e g using Win32 Disk Imager or dd command In order to prepare a microSD card with a native Android you will need a software tool called PhoenixSuit and then Install and run PhoenixSuit Go to the firmware tab of the program and point to a valid Android image note that the images on Gdrive are compressed and you have to extract the archives to img
33. erial cable for connection to the board from a personal computer since in this case you are dependent on a video resolution a cable like USB SERIAL CABLE F When the board boots type change_display or change display a20 olimex sh It looks like this Then the main menu of the video configuration script shows up and you can select the desired interface LCD HDMI or VGA Page 14 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual Select output asable all screens LCD Set configuration for LCD HDMI Set configuration for HDMI VGA Set configuration for VGA The supported resolutions for LCD 1 4 3 480x272 2 7 800x480 3 10 1024x600 The supported resolutions for HDMI 0 480i 1 576i 2 480p 3 576p 4 720p50 5 720p60 6 1080150 7 1080160 8 1080p24 9 1080p50 10 1080p60 The supported resolutions for VGA please note that there is no VGA connector and you would need to install additional hardware more instructions on the signals might be found in the chapter 6 1680x1050 1440x900 1360x768 1280x1024 1024x768 800x600 640x480 1920x1080 1280x720 Chose the resolution that suits you and reboot the board If you decide to edit the configurations yourself the easiest way would be to do it on the board This can be done offline too manipulating the image located on the microSD card via a microSD card reader Page 15 of 51
34. ey should be available for every Windows distribution refer to the respective files and articles provided by Microsoft on how to install the required drivers 2 5 5 SSH via Ethernet connector SSH protocol allows you to login remotely to the command line interface of the A20 OLinuXino LIME board You would need an active Ethernet connection to the board The newest images have a configuration that allows SSH via the Ethernet connector The static IP address to access the board is 192 168 1 254 2 6 Changing the default video output resolution Depending on the display or the screen you want to use with the A20 OLinuXino LIME2 you might need to apply software changes to the prebuilt Android or Linux image The typical OLinuXino user would not need to edit the files however To ease the process of changing the resolution we have compiled a number of Android images for the Android users with hard coded video output settings Alternatively for Debian Linux users we have provided a shell script that can be executed in order to set preferred video output and resolution For Android that you boot from the NAND memory you would need an image suitable for the specific resolution Download locations to such images might be found at the wiki article for the A20 board here https www olimex com wiki A20 OLinuXino LIME2 For Linux Debian you would need to execute a shell script to be able to change the resolution It is very good idea to use a s
35. f changing the firmware image located on the NAND of A20 OLinuXino LIME2 4GB is via the USB OTG connector the update of the Android image is explained at the bottom of this sub chapter The connector can also be used for establishing SSH connection to the default Debian Linux of LIME2 boards for more information about the tethering please refer to 2 5 4 SSH via mini USB cable in Debian The part of the schematic related to the USB_OTG is shown below 5y PC1 USBO DRY USBO VBUSDET L6 FBQ805 688R 2A USB DTE 5U OTG PHR The USB OTG features Low Loss Power Distribution Switch SY6280 which protects the board in case the devices you have plugged to the USB attempt to draw more current than 523mA combined The maximum current available on the 5V USB is exactly 523mA Page 28 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual The SY6280 responsible for the USB is enabled by USBO DRV processor pin C12 port B9 thus the USB is also controlled by the same signal Please note that the USBO DRV PC17 processor pin F23 also goes to the AXP209 The connector case is also grounded We have configured an Android image with settings suitable for A20 OLinuXino LIME2 You can upload it to the board with PhoenixSuit software via the USB OTG The image is available for users to try and tweak the settings The images can be downloaded from the wiki article at https www olimex com wiki A20 OLinuXino LI
36. files to be able write them with PhoenixSuit Disconnect the power supply and USB cable from the A20 board Put an SD card in micro SD holder We recommend 4GB class 10 card Press and hold RECOVERY button apply power supply 5V release RECOVERY button Connect USB cable to the mini USB connector You will be asked for drivers for the boot loader Navigate to the folder where you extracted the PhoenixSuit and install the drivers from the respective executables or manually point the installer to the drivers folder in the PhoenixSuit installation path PhoenixSuit will detect the board and would ask for the method of writing the image Choose Page 48 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual method of writing the image and confirm your wish to write the image Wait till upgrade succeeds Note that it is not recommended to have your mini USB connected to an external USB hub This might cause delays and might distort the signal levels Always test with the USB connected straight to the USB ports of your computer Important When Android runs for very first time it takes several minutes to initialize all files and buffers please do not cut the power supply during this process Also when fresh image is installed fast boot may be disabled which means that when you apply power supply after few seconds Android will go in sleep mode and you have to press PWR button to start it you can change to fast boot when you power off there
37. he connector also has the signals needed for a VGA output The official Linux Debian images include a script that can be used to change the video output to VGA We don t provide Android images for the VGA video output Microphone signals are MICIN1 and VMIC Headphone signals are HPOUTL HPCOM and HPOUTR Please note that part of the VGA and composite video signals are multiplexed VGA R VGA B VGA G share the same pins with the TVOUT signals Composite video signals are located on GPIO 1 connector TVOUTO GPIO 1 pin 20 TVOUTI1 GPIO 1 pin 22 TVOUT2 GPIO 1 pin 24 you would also need AGND GPIO 1 pin 4 VGA signals are located at GPIO 1 connector and LCD CON connector The total of 5 signals you need for VGA output can be split into two categories 1 Data signals VGA R AC17 VGA B AB16 VGA G AC16 2 Synchronization signals LCD VSYNC AC9 and LCD HSYNC AB9 If you inspect the schematics of a board with VGA connector like A20 OlinuXino MICRO or A20 SOM EVB carefully you would notice that there are two extra transistors on the synchronization lines Those are transistors meant to shift the levels to 5V The 3 3V levels from the processor might work but the standard requires 5V levels of VSYNC and HSYNC However if you lead the signals to a 6 pin header like the one on the A20 board you might use the cable for the A20 OlinuXino MICRO called A20 VGA CABLE The 6 signals needed are the 5 signals mentioned about plus GND
38. inux operating system of the board is using the serial connection available at UARTO connector You would probably need an USB SERIAL cable for such a connection Even if you intend to use HDMI or LCD it is a good idea to have it as a basis the video output is not always reliable and if you set wrong display settings you would be unable to recover the software without an alternative connection We distribute a ready to use cable Even if you already have such a cable or you decide to purchase it elsewhere it is advisable to check this product page for a reference Product page Note that the levels at board s UARTO are in CMOS level 3 3V and you would need a convertor to bring them to the TTL level of your computer or cable That is true for the RX and TX also You would need to consider that if you decide to make your own cable Page 12 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual The cable probably needs drivers after successful driver installation a COM port device would show up in the hardware manager of your computer Then you would need to connect the serial cable wires to the board as follows RX line to UART1 TX pin TX line to UART1 RX pin GND to GND The last pin of UART1 connector is named 3 3V and it can be used to power the board if you have other ways of power the board leave 3 3V pin unconnected Be careful to avoid the connection to the serial cable else there would be a short circuit Make sure that the seria
39. is dialog box asking you if you want next boot to be fast boot you have to check this box before you power off Also note that you must do touch screen calibration when you run Android for very first time which might require a mouse Q How to edit board configurations and definitions in the official Debian Linux A Do you want a custom video resolution output Do you need a different port definition Do you need to change the hardware definitions of the board It is explained above in the manual But you can also visit this wiki article wiki article Q How to edit board configurations and definitions in the official Android images A There is a wiki article about that please visit wiki article Q Is it possible to boot Debian from NAND Do you provide such image A Yes it is possible Use the latest Debian Jessie image and write nandinstall If there are problems try to upload Android first to the NAND and then try nandinstall again More information can be found in this wiki article installing Debian Jessie to the AGB NAND memory There are other people who are also successful in booting Debian from the NAND Make sure to check on the forum Make sure to check the number of very good and optimized A20 OLinuXino Debian images by Igor Pe ovnik There are also his instructions for NAND installation of Debian link to his web site Is it possible to boot Debian from eMMC Do you provide such image A Yes it is possible U
40. is work is licensed under the Creative Commons Attribution ShareAlike 3 0 Unported License To view a copy of this license visit http creativecommons org licenses by sa 3 0 If you are looking for a schematic of an older revision of the board and it isn t available at our web site you may request it by the support e mail Page 42 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 7 2 Physical dimensions Note that all dimensions are in mils ee gre 2 S 2EELELLELETI ngmg a 00 ng LQFP48 0000 All dimensions are in mills 3305 Page 43 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual CHAPTER 8 REVISION HISTORY AND SUPPORT 8 Introduction to the chapter In this chapter you will find the current and the previous version of the document you are reading Also the web page for your device is listed Be sure to check it after a purchase for the latest available updates and examples 8 1 Document revision Document revision mangs pages A 27 02 15 Initial manual release c Updated HDMI part according to the latest schematic Updated DDR3 memory according to the latest schematic B 17 03 15 Made it more obvious that there are differences in the layout of LIME2 and LIME connector board layout Clarified that the 4GB version of the board is now sold without Android Updated hardware board revision changes C 30 11 15 Clarified that we no l
41. l cable is connected to your personal computer and recognized properly after driver installation Then open a terminal program on the serial COM port which the cable is associated with The settings for the connection are 115200 baud 8 N 1 After everything else is set you would need to power the board as explained in 2 3 Powering the board 2 5 2 HDMI monitor The board comes equipped with HDMI connector to connect to a compatible monitor However there is no cable included Make sure to use a tested HMDI cable official Debian and Android images for A20 OLinuXino LIME2 have HDMI output enabled by default The board should work out of the box with a native HDMI monitor The default HDMI resolution in the official images is 720p60 1280x720p at 60Hz In order to change that setting the video output on the LCD display you would need to run a configuration script if you use Debian Linux or download a suitable image if you use Android Video output settings are hard coded in Android images but there are ways to edit the images You might find more information about editing pre built Android images at this wiki article how to edit prebuilt Android images More information about the video output settings and the usage of video settings script might be found in chapter 2 6 Changing the default image resolution 2 5 3 LCD display Various LCD displays can be attached to A20 OLinuXino LIME2 and used to interact with the board Dep
42. ly to access unused by the board s peripherals pins However there are exceptions some of the pins might be used to easily peripherals or their levels Three of the GPIO connectors have 40 pins and the last one has 20 pins Note that all GPIO connectors have 0 05 50 mil step between pins Olimex sells a compatible extension cable for these connectors named CABLE 40 40 10CM IMPORTANT the cables and the 0 05 connectors are very fragile if you attempt to disconnect the Page 33 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual setup by pulling the cable it might break Furthermore you might bend the board s or the cable s pins Use pliers or other suitable object to disconnect the connectors carefully Important each pair of rows of pins of all GPIO connectors on A20 OlinuXino LIME2 are swapped compared to A20 OLinuXino LIME and A10 OLinuXino LIME Most of the pins are already defined in default operating system images Some of them can be used as GPIOs I2C or SPI without much of a problem Information on the software usage of GPIO ports might be found in chapters 2 8 GPIO under Debian and 2 9 I2C and SPI under Debian 6 9 1 GPIO 1 General Purpose Input Output 40pin connector This connector features the processor signals needed for audio headphones output and microphone input Please note that not only the connectors but also the rest of the schematic is missing You would need to add resistors and capacitors T
43. nection You can enable the Ethernet after a successful boot up with ifconfing a dhclient eth as seen after after the ifconfing command Important You can configure static DHCP given IP addresses in etc network interfaces LED LED Color Usage Bi color LED1 Orange Green Speed status Link status Single color LED2 Yellow Activity status The speed status of LED1 typically indicated by the orange color of the bi color LED1 is not available Only the link status indicated by the green LED is available currently Page 31 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 6 7 HDMI connector The part of the schematic that describes the HDMI module is shown below IN1 OUT1 IN2 OUT2 IN3 OUT3 IN4 OUT4 GND GND IN1 OUT1 IN2 OUT2 IN3 OUT3 IN4 OUT4 GND GND IN1 OUT1 IN2 OUT2 IN3 OUT3 IN4 OUT4 GND GND NACRCLAMP 524P HDMI SWM 19 Note that there are different Linux images depending whether the HDMI TV works at 50Hz or 60Hz refresh rate If you board runs Android there is a specific option to set the appropriate HDMI output POWER CIRCUIT POWER CIRCUIT HCEC HSCL HSDA HHPD Pin 14 of the HDMI is not mandatory In HDMI 1 0 1 3c it is reserved pin in HDMI 1 4 it is optional Page 32 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 6 8 SATA connector and power The part of the schematic describing the SATA module is shown below SATA comector sd connecto
44. onger load Android D 23 12 15 on the 4GB version of the board Added information about Debian nandinstall Added info that default memory clock of pauci 384Mhz in the latest official images F 07 02 17 Fixed wrong pinout in GPIO 3 table Fixed a number of typos added information about the new hardware revision added information about different variants of the board G 08 09 17 Page 44 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 8 2 Board revision Remember to check the schematics and the board design files to compare the differences C released Initial release of the board 1 Added eMMC option can be used instead of NAND By default everything is set to NAND 2 Added C224 and C232 47uF 6 3V 0805 in parallel to the 5V SATA connector 3 Changed L1 L2 L3 from FB 600R 0805 to 06 0805 the power supply D not released lt lt more stable with the new values 4 Capacitors C84 C85 changed from 100nF 0402 to 22uF 0603 5 Fixed the white print at the bottom of the board now it properly says A2 OlinuXino LIME2 6 Completely re routed the Ethernet and the EEPROM in order to reduce noise 1 Small improvements in routing libraries and cream layer 2 The 3 pin SMD jumper EMMC PWR now gets a white print for the E not released different positions 3 Board s revision name was changed to Rev E 4 015 and U17 were changed from SY8 8C AA C to SY8009AAAC SOT23 5 Potens
45. oot as per our instructions and either set higher clock speed in the MENUCONFIG or directly change the value of the CONFIG_DRAM_CLK in the defconfig file for the board The DDR3 memory part name in the schematic might be outdated We have used a number of different but fully compatible DDR3 memories due to supply unavailability It is always recommended to check the exact memory name printed on the component itself 4GB 1x 32Gb 4096M x 8b NAND FLASH only available on the 4GB version of the board the exact memory used in the board revision mentioned is HYNIX H27UBG8T2BTR PWR LED turns on upon powering the board CHGLED lights when charging a battery connected to the Li Po battery connector Page 41 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual CHAPTER 7 SCHEMATICS 7 Introduction to the chapter In this chapter is located information about the schematics describing logically and physically A20 OLinuXino LIME2 7 1 Eagle schematic OLinuXino schematics may be found it on the OLinuXino s GitHub repository https github com OLIMEX OLINUXINO tree master HARDWARE You can download the whole repository as zip without having a GitHub account We mostly use Eagle by Cad Soft 4 16r2 for designing However the files should be compatible with the latest Eagle available Cad Soft offers a trial version of their software that allows you to inspect schematics and board files without being able to modify them Th
46. r S ATA oo E T 128 ll 18nF SATA RXM_c129 10nF SATA RXP_c134 ll 18nF 50 5U E u 2 50 SATA PHR The SATA connector allows you to connect hard drives to CON2DLIO2 the board There is support for SATA drives in the official images The connector is suitable for both regular hard drives and SSD ones Note that you can power only 5V hard drives via the board s SV SATA PWR connector If your hard drive requires 12V of voltage you would need to provide external power supply CC To keep the low form factor we have placed the small JST connector You can make an adapter cable accordingly The other options is to check the SATA CABLE SET that we have available For more information please visit https www olimex com Products Components Cables SATA CABLE SET Pay note the two jumpers 5V E SATA and PC3 PB8 located at the bottom of the board under the HDMI connector The first one 5 E SATA is open by default because the board has software control of the powering for the hard disk If you close 5 E SATA there would always be 5V at the 5 SATA PWR connector Which pin does the software control of the SATA powering is determined by the position of the PC3 PB8 jumper By default PC3 is used 6 9 GPIO connectors There are four GPIO ports which are used general
47. se contained in this document are given by OLIMEX in good faith However all warranties implied or expressed including but not limited to implied warranties of merchantability or fitness for purpose are excluded This document is intended only to assist the reader in the use of the product OLIMEX Ltd shall not be liable for any loss or damage arising from the use of any information in this document or any error or omission in such information or any incorrect use of the product This evaluation board kit is intended for use for engineering development demonstration or evaluation purposes only and is not considered by OLIMEX to be a finished end product fit for general consumer use Persons handling the product must have electronics training and observe good engineering practice standards As such the goods being provided are not intended to be complete in terms of required design marketing and or manufacturing related protective considerations including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards Olimex currently deals with a variety of customers for products and therefore our arrangement with the user is not exclusive Olimex assumes no liability for applications assistance customer product design software performance or infringement of patents or services described herein THERE IS NO WARRANTY FOR THE DESIGN MATERIALS AND THE COMPONENTS USED TO
48. se the latest Debian Jessie image and type emmc sh More information can be found in this wiki article installing Debian Jessie to the eMMC memory Q How to generate boot able SD card Debian Linux image for A20 OLinuXino LIME A Build instructions and required files for the latest Debian images can be found in our GitHub repository Building Debian Wheezy images https github com OLIMEX OLINUXINO tree master SOFTWARE A20 A20 build 3 4 90 Building Debian Jessie images https github com OLIMEX OLINUXINO tree master SOFTWARE A20 A20 build 3 4 103 Note that Linux Sunxi kernel is a work in progress this means you can try the current stage sunxi x x Page 49 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual branch but if something is broken and doesn t work just revert to the git tags we give in the blog and they would work for sure Q Can I use mainline kernel instead of Sunxi kernel A You can However most kernels are headless no audio or video output are supported If you don t need audio or video go for it it had been tested and confirmed working there are installation reports even here https wiki debian org InstallingDebianOn Allwinner I have a 4GB version of the board The board doesn t seem to have Android loaded A We no longer load Android on the NAND memory of the boards You can upload Android following the advice above in this document Page 50 of 51 OLIMEXO 2017 A20 OLinu
49. soldered to or have had their firmware changed Because of the nature of the products we deal with prototyping electronic tools we cannot allow returns of items that have been programmed powered up or otherwise changed post shipment from our warehouse All returned merchandise must be in its original mint and clean condition Returns on damaged scratched programmed burnt or otherwise played with merchandise will not be accepted All returns must include all the factory accessories which come with the item This includes any In Circuit Serial Programming cables anti static packing boxes etc With your return enclose your PO Also include a brief letter of explanation of why the merchandise is being returned and state your request for either a refund or an exchange Include the authorization number on this letter and on the outside of the shipping box Please note It is your responsibility to ensure that returned goods reach us Please use a reliable form of shipping If we do not receive your package we will not be held liable Shipping and handling charges are not refundable We are not responsible for any shipping charges of merchandise being returned to us or returning working items to you The full text might be found at https www olimex com wiki GTC Warranty for future reference Page 51 of 51
50. supply of 5V The minimum wattage is 2 5W and this threshold may raise if using a lot of devices on the USB HOST via external hub a lot of GPIOs or you have a display connected to the LCD_CON or a hard disk powered from the 5V_SATA_PWR connector If a discharged Li Po battery is connected to the respective connector the power consumption of the whole LIME2 board might rise enormously since the built in battery charger would attempt to recharge it For more info on how to power the board refer to chapter 2 3 Powering the board Page 25 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual CHAPTER 6 CONNECTORS AND PINOUT 6 Introduction to the chapter In this chapter are presented the connectors that can be found on the board all together with their pinout and notes about them Jumpers functions are described Notes and info on specific peripherals are presented Notes regarding the interfaces are given 6 1 UARTO interface The UARTO interface might be used for serial communication between the board and a personal computer by default In case of video output problem a cable might provide needed feedback and greatly reduce the efforts needed to repair the board or to adjust the software setting Note that by default only UARTO is defined as a port suitable for serial debug You can use our USB SERIAL CABLE F for debugging Consider table below when connecting the USB SERIAL CABLE F according to the wire color code The RX line
51. t Output 40 pin 37 6 9 4 GPIO 4 General Purpose Input Output 2 Opin CODBGUF iunc erecti re eee ttd 37 S T revisio sd pose osos v Sepe Seo E a ed Dd 44 BEA E TUE MIRARI 45 Page 4 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual CHAPTER 1 OVERVIEW 1 Introduction to the chapter Thank you for choosing this OLinuXino single board computer from Olimex This document provides a user s guide for the Olimex A20 OLinuXino LIME2 board As an overview this chapter gives the scope of this document and lists the board s features The document s organization is then detailed The A20 OLinuXino LIME2 development board enables code development of applications running on the A20 microcontroller manufactured by Allwinner Technology from China OLinuXino is an open source open hardware project and all design files are available to the customer 1 1 Features The board has the following set of features A20 Cortex A7 dual core ARM Cortex A7 CPU and dual core Mali 400 GPU e 1GB DDR3 RAM memory e 1000MBit native Ethernet 4GB or 8GB NAND FLASH memory available only on certain variants of the board 4GB eMMC memory available
52. table for 0 1 step connectors Product page CABLE 40 40 10CM 10cm long cable suitable for 0 05 step connectors Product page The displays recommended for the board at the moment of writing might be found in the following table Display name Size of Native Official Official Link to product display resolution Debian image Android image page in inches jin pixels support support LCD OlinuXino 4 3TS 4 3 480x272 Yes No Product page LCD OLinuXino 7 7 800x480 Yes Yes Product page LCD OLinuXino 7TS 7 800x480 Yes Yes Product page LCD OLinuXino 10 10 1024x600 Yes Product page LCD OLinuXino 10TS 10 1024x600 Yes Yes Product page LCD OLinuXino 15 6 15 6 1366x768 Yes No Product page LCD OLinuXino 15 6FHD 15 6 1920x1080 Yes No Product page The displays whose names contain TS include a resistive touch screen component 2 7 1 Android calibration Calibrating a display under Android is pretty straightforward from the Android application Important initially the boards are calibrated for a specific display and resolution If you re write the image no matter whether the SD card or the NAND memory you might need to use a mouse to calibrate the display initially It might be impossible to calibrate it via touching the display Page 17 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 2 7 2 Debian calibration The command that allows calibrating in Debian Linux is ts calibrate
53. ted class 10 micro SD card with the latest by the time of leaving Olimex facilities official Debian Linux release USB SERIAL CABLE F female USB serial console cable USB MINI CABLE standard USB type A to USB type mini cable A20 OLINUXINO LIME2 UEXT GPIO adapter which makes LIME2 GPIOs available in breadboard friendly 0 1 step connectors needed if you want to connect an older Olimex made display to the board newer displays listed below have 0 05 step connector CABLE 40 40 10CM 0 05 step cable for connecting a new display to the board LCD OLINUXINO 4 3TS low cost 4 3 LCD display with touchscreen component 480 272 LCD OLINUXINO 7TS low cost 7 LCD display with optional touchscreen component 800x480 LCD OLINUXINO 10TS low cost 10 LCD display with optional touchscreen component 1024x600 LCD OLINUXINO 15 6 low cost 15 6 LCD display 1366x768 LCD OLINUXINO 15 6FHD low cost Full HD 15 6 LCD display 1920x1080 CABLE IDC40 15cm 0 1 step cable for connecting an LCD to LCD CON SATA HDD 2 5 500GB 500GB 2 5 SATA hard disk SATA CABLE SET cables that allow the connection of a 2 5 hard disk to the board ALUMINIUM HEATSINK 20x20x6MM heatsink radiator for better processor heat dissipation Page 10 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 2 3 Powering the board There are three possible ways of powering A20 OLinuXino LIME2 via external supply providing 5V DC at the power ja
54. ter and cheaper to purchase Olimex products from our distributors List of confirmed Olimex LTD distributors and resellers https www olimex com Distributors Page 46 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 8 4 Frequently asked questions Q I power my board it shows a logo and then nothing happens A This might be due to a number of reasons but it is recommended to try the following 1 Download latest official image from our wiki either Android or Debian for SD card and upload it to an SD card again There are instructions how to do it in the other questions below Try if the board works now 2 Check if your power supply provides enough current try with different better power supply 3 Check the USB hub you are using plug the USB cable directly to the back of your personal computer check the USB cable 4 The board might enter sleep mode very fast especially if the Android was turned off without the Quick Boot mode being ticked on Try pressing or holding down the PWR button for a couple of seconds to wake it up Q What is the operating temperature range of A20 OLinuXino LIME2 A The board works in the commercial temperature range 0 70C Q How long this board will be available A This board will be available forever Q Iuse LCD CON for video output There is some screen flickering under Debian What could be the reason A This is usually caused by either a loose cable connection or badly configur
55. the built in the image resolution settings Start it with change display a20 olimex sh and follow the instructions Please refer to chapter 2 6 Changing the default image resolution for more information Page 39 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 6 11 Jumper description Please note that most the jumpers on the board are SMT type If you feel insecure of your soldering cutting technique it is better not to try to adjust the jumpers since it is possible to damage the board Board jumpers Either CLOSED or Controls whether the NAND memory OPEN depending module is enabled or disabled whether the board has 4GB NAND MEMORY If the jumper is closed than the NAND MODULE memory is operational Controls which processor pin should be used for SATA power enabling signal By default the SATA powering control uses processor pin L22 which is port PC3 Changing this jumper also changes the PC3 availability of PC3 and PB8 at GPIO 1 pin 29 and GPIO 3 pin 16 Please note that if you change the position of the jumper from PC3 to PB8 then you might block one of the processor pins responsible for I2S and AC97 audio output al Jumper name Controls which processor pin should be used for the USB OTG By default the USB OTG uses processor pin C12 which is port PB9 The same pin port is used for I2S audio In case you want to access the I2S capabilities of the board you would need to change the default position PB
56. tion settings and definitions not only for the video output but also for the pin descriptions and names power setting and much more If you really want to modify and customize the default images to change port functions port names to disable specific peripherals you would need to be able to edit the script files Please refer to the following web page for more information http linux sunxi org Fex Guide Page 16 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 2 7 Connecting and calibrating a display One of the ways to interact with the board is via an external display with or without touchscreen component If you want to use a display for video output from the LIME board the best way is to use the LCD CON row of pins The step between the pins of the connector is the smaller one only 0 05 compared to 0 1 of bigger boards Newer displays made by Olimex have both 0 1 and 0 05 step connectors Going for an LCD output you would also need need and a cable to attach the display to the board The cable is sold separately The cable used for connection depends on the specific board you are using and more specifically it depends on the pitch of the LCD connector of the board We have two cables both 40 pins ones but one for the bigger pitch 0 1 and the other for the smaller one 0 05 Each of the displays listed in the table further below has two connectors suitable for both cables CABLE IDC40 6cm long cable sui
57. ttery connector Sometimes when starting Android it is possible the board to enter battery save mode even before booting fully Especially if you have turned off the board without quick boot mode enabled In this case you should press the PWR button for at least 5 seconds which would allow the board to start For the European customers we sell two power supply adapters please check chapter 2 2 We also sell USB OTG to USB type A cables if you lack such The default username password combination for the default Linux image on the SD card if purchased is root olimex Note that it is normal that when the board is powered some integrated circuits might appear hotter than others This is perfectly normal for some chips for instance voltage regulators and the main processor Page 11 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual 2 4 Button functions The bellow three buttons usually are supported under both Android and Debian PWR used to perform software turn off software turn on used to turn on board when powered by battery has to be held down for at least 5 seconds to perform each action RESET used for hardware reset of the board RECOVERY used to wake up the board from sleep It is recommended to always make a soft turn off of the board If that is not possible then please hold PWR button down for a few seconds to turn off the board Then you are free to remove the power supply If you disconnect the po
58. wer supply either the USB the battery or the power jack before turning off the board you may corrupt your SD card If you have placed NAND memory you can corrupt the image on the NAND memory 2 5 Interacting with the board There are five typical ways to interact with A20 OLinuXino LIME2 You can interact with A20 OLinuXino LIME2 and a personal computer or another board via UARTO and a serial ow cable an HDMI monitor via the HDMI connector and an HDMI cable an LCD display via LCD CON connector and 0 05 step 40 pin cable a personal computer or another board via the mini USB connector and a mini USB cable using SSH protocol a personal computer via the Ethernet connector and a LAN cable using SSH protocol More details on each of the connections might be found in the consequent sub chapters Note that not all interface options are available for all images Furthermore some of the ways of interaction are obviously not suitable for Android OS The official Debian image should give you the most possible options of interfacing the board Using HDMI LCD CON or LAN might require additional configurations Furthermore it is possible to corrupt the output settings over those interfaces and thus lose the output In such cases you can always use the serial cable USB SERIAL CABLE F as a reliable way to establish connection to the board 2 5 1 Serial connection at UARTO The default and recommended way to communicate with the L
59. you need that to connect more USB Page 9 of 51 OLIMEXO 2017 A20 OLinuXino LIME2 user s manual devices External power supply unit 5V DC 5W required for optimal power BOX LIME a metallic and aesthetic box specially made for the board that protects it from dust and accidental short circuits USB SERIAL CABLE F for Android Linux debugging on UARTO Additional items include Small heatsink for the processor during long video playbacks the A20 processor might heat up External 2 5 SATA hard disk drive proper cables sold separately Ethernet cable for wired Ethernet Important note on requirements The board works with 2 5 SATA hard disks that can be powered by 5V source from the board For the 3 5 hard disks you would probably need to provide external 12V supply It is a very good idea to have a USB SERIAL CABLE or similar cable since it allows you to 1 Change display output settings for Debian easily 2 Debug the board via any personal computer even if there are problems with the video output Some of the above suggested items can be purchased by Olimex for instance SY0605E reliable power supply adapter 50Hz for EU 5V 1A for A20 OLinuXino LIME SY0605E CHINA cheaper power supply adapter 50Hz for EU 5V 1A for A20 OLinuXino LIME A20 LIME ANDROID SD a tested class 10 micro SD card with the latest by the time of leaving the Olimex facilities official Android release A20 LIME DEBIAN SD a tes

A20-OLINUXINO-LIME2 and A20-OLINUXINO-LIME2-4GB

Contents

Download Pdf Manuals

Related Search

Related Contents