AM335x PSP User's Guide
Contents
1. Setup the SD card as described in Setting Up Boot Environment on SD Card l and When Kernel Image and File system are placed in SD card U Boot setenv bootargs console tty00 115200n8 root dev mmcb1k0p2 mem 128M rootwait U Boot setenv bootcmd mmc rescan fatload mmc 0 0x82000000 uImage bootm 0x82000000 AM335x PSP User s Guide Boot from NAND Make sure the Boot Mode Configuration Select Switch is set for the NAND boot mode as described in NAND boot 5 switch settings section Power on AM335x EVM and wait for U Boot prompt of the 2nd stage U Boot to come up on the serial console When kernel uImage and JFFS2 filesystem are flashed on the NAND device U Boot nand read i 0x81000000 280000 500000 U Boot setenv bootargs mem 128M console tty00 115200n8 noinitrd root dev mtdblock4 rw rootfstype jffs2 ip dhcp U Boot bootm 0x81000000 When kernel image is flashed on the NAND device and NFS mounted filesystem is being used U Boot nand read i 0x81000000 280000 500000 U Boot setenv bootargs console tty00 115200n8 root dev nfs nfsroot 172 24 179 98 nfs_root nolock rw mem 128M U Boot bootm 0x81000000 Boot from SPI Make sure the Boot Mode Configuration Select Switch is set for the SPI boot mode as described in SPI boot switch 6 settings section Power on AM335x EVM and wait for U Boot prompt of the 2nd stage U Boot to come up on the serial console Assuming kernel image is flashed on t2. images t examples io amooo Eaa EO kernel Eo am SOx T OOE OE o E E MEO t 6PC kernel ChangeLog MM mm pp bb OL ine Seale MIM Mai 5 JOS OO kernel patches MM mm pp bb tar gz Linx iii ojo Jl CAE 6 GZ INO 2 Cho Unified patch MM mm pp bb gz AM335x PSP User s Guide U19OGIE ChangeLog MM mm pp bb ObL ine se alie MIM Mil OjS 51019 1S INO E LOG u boot patches MM mm pp bb tar gz SOO MIM MN JOD o ISIS 5 CEE Gz Unified patch MM mm pp bb gz REE CNE 5 EXE examples xamples MM mm pp bb tar gz Instructions to extract U Boot Linux amp Example source code from tar archive NOTE Below steps assumes that release package is extracted inside directory represented as A4M335x PSP DIR Install U Boot e U Boot source tarball is u boot MM mm pp bb tar gz needs to be extracted on Linux build host This will create U Boot source base for AM335x cd SAM335x PSP DIR AM335x LINUX PSP MM mm pp bb src u boot S tar xvfz u boot MM mm pp bb tar gz Install Linux Kernel e Similarly kernel source tarball linux MM mm pp bb tar gz needs to be extracted to have kernel source directory setup for building kernel and or modules cd AM335x PSP DIR AM335x LINUX PSP MM mm pp bb src kernel S tar xvfz linux MM mm pp bb tar gz e Various exa
3. processors wiki ti com index php AM335x_U Boot_User 27s_Guide Setting_Up_Boot_Environment_on_SD_Card http processors wiki ti com index php AM335x_U Boot_User 27s_Guide NAND http processors wiki ti com index php AM335x_U Boot_User 27s_Guide SPI http Ixr linux no linux v3 1 Documentation rtc txt http linux die net man 8 hwclock Article Sources and Contributors 13 Article Sources and Contributors AM335x PSP User s Guide Source http processors wiki ti com index php oldid 153334 Contributors AJ AjayGupta Chanilkumar Gguyotte Gururaja Hvaibhav Kevinsc Rachna SekharNori Sudhakar raj TimHarron VaibhavBedia X0155329 Image Sources Licenses and Contributors Image TIBanner png Source http processors wiki ti com index php title File TIBanner png License unknown Contributors Nsnehaprabha License THE WORK AS DEFINED BELOW IS PROVIDED UNDER THE TERMS OF THIS CREATIVE COMMONS PUBLIC LICENSE CCPL OR LICENSE THE WORK IS PROTECTED BY COPYRIGHT AND OR OTHER APPLICABLE LAW ANY USE OF THE WORK OTHER THAN AS AUTHORIZED UNDER THIS LICENSE OR COPYRIGHT LAW IS PROHIBITED BY EXERCISING ANY RIGHTS TO THE WORK PROVIDED HERE YOU ACCEPT AND AGREE TO BE BOUND BY THE TERMS OF THIS LICENSE TO THE EXTENT THIS LICENSE MAY BE CONSIDERED TO BE A CONTRACT THE LICENSOR GRANTS YOU THE RIGHTS CONTAINED HERE IN CONSIDERATION OF YOUR ACCEPTANCE OF SUCH TERMS AND CONDITIONS License 1 Definitions a Adaptation mean
4. kernel can be made to use the same IP address as assigned to U Boot instead of doing DHCP request again by setting U Boot parameters as follows U Boot print ethaddr lt Check if MAC address is assigned and is unique U Boot setenv U Boot setenv U Boot setenv U Boot setenv U Boot setenv U Boot setenv U Boot setenv U Boot setenv U Boot saveenv U Boot boot ethaddr lt unique MAC address gt lt Set only if not present already format xn yy zz aa bb cc bootemd dhcp run addip tftp 81000000 ulmage bootm hostname lt unique hostname gt addip setenv bootargs bootargs ip ipaddr nfsserver gatewayip netmask hostname eth0O off autoload no nfsserver lt nfs server ip gt lt Make sure the same NFS server IP is used below bootargs console tty00 115200n8 root dev nfs nfsroot lt nfs server ip gt lt path to nfs share gt nolock rw mem 128M serverip lt tftp server ip gt e After saving the environment variables they need not be setup again on reboot unless a change is required e Note that the above example uses NFS mounted root file system accessed over eth0 interface NOTE ethaddr need not be set for devices having valid MAC IDs set In such cases U Boot will automatically detect and set the ethernt address should show message like Detected MACID Various Module User s Guide GPIO Driver AM335X has four GPIO modules provides 32 dedicated general purp
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7. spi0_d0 View current pin mux setting root arago armv7 debugfs omap_mux cat spi0_d0 name spi0_dO spi0_dO 0x44e10954 0x954 0x0020 b NA t NA mode OMAP_MUX_MODEO AM33XX_PIN_INPUT_PULLDOWN AM335x PSP User s Guide 10 signals SOLO 0O waic2 cxe 2262 Sell WA NA WA WA gpio0 s3 Another example 0x31 is an example for MODE 1 Input mode PULL Enabled with PULL UP mode root arago armv7 debugfs omap_mux echo 0x31 gt spi0_d0 View current pin mux setting root arago armv7 debugfs omap_mux cat spi0_d0 name spi0_dO uart2_txd 0x44e10954 0x954 0x0031 b NA t NA mode OMAP_MUX_MODE1 AM33XX_PIN_INPUT_PULLUP signalss SLO C0 Weiser c i262 sell NA IVA INA INA GjotLoOO_S Clock Management details Clock tree from debugfs Details of clocks such as rate usecount and flags can be viewed through debugfs entries of the clocks To access these details one has to mount the debugfs root directory first follow the steps below to mount debugfs and view clock details e Make sure Kernel is built with debugfs support default is with debugfs support refer Modifying Kernel configuration section make ARCH arm CROSS_COMPILE arm arago linux gnueabi menuconfig Select Power management options gt Power Management Debug Support e Ensure that Kernel hacking gt Debug Filesystem is selected in Kernel configuration by default it is selected e Mount the debugfs filesystem mo
8. AM335x PSP User s Guide AM335x PSP User s Guide 1 TEXAS INSTRUMENTS AM335x PSP User Guide Linux PSP About this Manual This document describes how to install and work with Texas Instruments Platform Support Package PSP for the AM335x platform This PSP provides a fundamental software platform for development deployment and execution on AM335x EVM It abstracts the functionality provided by the hardware The product forms the basis for all application development on this platform In this context the document contains instructions to e Install the release Build the sources contained in the release The document also provides detailed description of drivers and modules specific to this platform as implemented in the PSP IMPORTANT This release has been tested on AM335x EVM BeagleBone board AM335X EVM Configuration For more information regarding EVM Combinations amp Configurations Please refer to EVM reference manual Oy Installation Prerequisites Before Starting the installation of the package please make sure below system requirements are met e Host machine running a version of Windows OS such as Windows XP SP3 Linux such as Ubuntu e AM335x BeagleBone or EVM board The Windows machine is used for e Running CCSv5 1 which will be used to build flash writers e Burn the boot images U Boot onto the flash using the flash writers provided The Linux host is used for the following e Recom
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10. ago armv7 sys kernel debug clock clk_32768_ck cat usecount 3 root arago armv7 sys kernel debug clock clk_32768_ck Parent change Currently changing a parent clock is not supported through clk this can be done from uboot command prompt as below e Load uboot wait for Ist stage to complete e Interrupt the autoboot of 2nd stage countdown from 3 0 e Find the clocksel register corresponding to the clk whose parent needs to be changed e write the value corresponding to new parent to the register example To write to a reg mw 0x481c50c4 0x3 To read from a reg md 0x481c50c4 1 for help help Set rate support Some clocks support changing clock rate dynamically at runtime clock rate of a clock may be changed only if e The clock is not used by any module or none of its child clock is in use i e clk gt usecount is zero e When setting the rate of a leaf clock parent is not in use i e parent gt usecount is zero e Changing the clock rate will not cause system unstability To change a clock s rate 1 Get the pointer to clk struct by clk clk_get dev_id clk_name 2 Set the new rate i e lk gt g6r bans ret clk gt set_rate clk AM335x PSP User s Guide 12 References http www ti com tool tmdxevm3358 http software dl ti com dsps dsps_public_sw am_bu sdk AM335xSDK latest index_FDS html http processors wiki ti com index php AM335x_U Boot_User 27s_Guide SD http
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12. e0_name gt lt signal_name gt lt value gt lt mode0_name gt lt signal_name gt lt value gt E g to set mmcl_cmd_mux0 mode 0 pin to gpio0_0 and enable pull down append following to kernel command line passed from the boot loader omap_mux mmcl1_cmd_mux0 gpio0_0 0 For pull up set bit 17 omap_mux mmcl1l_cmd_mux0 gpio0_0 0x20000 configuration for multiple pins can be passed which are separated by comma For details about this boot parameter refer Documentation kernel parameters txt in kernel source directory Method III Modify pin mux from Linux Console Pin mux can also be setup from kernel console This requires debugfs support 1 Make sure kernel is built with debugfs support Configure the kernel to enable debugfs Symbol DEBUG_FS y Type boolean Prompt Debug Filesystem Defined at lib Kconfig debug 89 TECON gt Kernel hacking 2 Boot the target hardware and mount debugfs mkdir p debugfs mount t debugfs debugfs debugfs cd debugfs omap_mux 3 Assume spi0_d0 pins needs to be set View current pin mux setting root arago armv7 debugfs omap_mux cat spi0_d0 name spi0_d0O gpio0_3 0x44e10954 0x954 0x002f b NA t NA mode OMAP_MUX_MODE7 AM33XX_PIN_INPUT sicgnalss SOLO CO weueczZ c i262 sell NA MA INA NA Goio s Change pin mux value 0x20 is an example for MODE 0 Input mode PULL Enabled with PULL DOWN mode root arago armv7 debugfs omap_mux echo 0x20 gt
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16. ge which need to be present in the flash memory of the EVM The flash writers are a part of the PSP package Instructions on how to use the flash writers in CCSv4 v5 can be found in AM335x Flashing Tools Guide U Boot For details about AM335x U Boot refer AM335x U Boot User s Guide Linux Kernel For details about AM335x Linux refer AMSDK Linux User s Guide Booting Linux Kernel Kernel along with root filesystem can either be booted from on board storage device or can be fetched over the Ethernet or UART to RAM using TFTP or serial protocols like YMODEM and booted from there Also the root filesystem can be formatted as JFFS2 and flashed which then can be mounted as MTD root block device Please refer to the U Boot User Guide for details about flashing and supported storage devices Following sections describe various kernel boot options possible NOTE The offsets and MTD partition numbers used in examples below may vary depending upon actual partition layout used on particular storage device Also selecting multiple storage device support in kernel e g NAND amp SPI may change the effective partition number to be used as root partition Boot from MMC SD Make sure the Boot Mode Configuration Select Switch is set for the MMC SD boot mode as described in SD boot 3 switch settings section Power on EVM with SD card inserted and wait for U Boot prompt of the 2nd stage U Boot to come up on the serial console
17. he SPI flash 0x62000 and NFS based root filesystem is used U Boot sf read 0x81000000 0x62000 0x200000 U Boot setenv bootargs console tty00 115200n8 root dev nfs nfsroot 172 24 179 98 nfs_root nolock rw mem 128M U Boot bootm 0x81000000 Boot over Network Ethernet NOTE When setting a MAC address please ensure that the LS bit of the Ist byte is not i e when setting the MAC address y in xy ab cd ef gh jk has to be an even number For more info this refer to the wiki page http en wikipedia org wiki MAC_address When kernel image and ramdisk image are fetched from a TFTP server e Ensure that the EVM is connected to network with DHCP and TFTP server set up e Ifthe TFTP server supports negotiation between client and server Disable it e Copy kernel image and ramdisk to TFTP server s root directory e Set ethaddr U Boot environment variable with proper ethernet address in format xx xx Xx XX xx xx replace xx with proper hexadecimal values e Execute following commands at U Boot prompt Assuming kernel image name as ulmage and ramdisk file name as ramdisk gz U Boot setenv autoload no U Boot dhcp U Boot setenv serverip lt Server IP Address gt U Boot tftp 0x81000000 ulmage U Boot tftp 0x82000000 ramdisk gz U Boot setenv bootargs mem 128M console tty00 115200n8 root dev ram0 initrd 0x82000000 40M ramdisk_size 32768 ip dhcp U Boot bootm 0x81000000 AM335x PSP User s Guide e Alternatively
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19. me Buffer Driver LCDC LCD controller is updated version of LCDC found on DA850 Please refer AM335x LCD Controller Driver s Guide for more details Touchscreen Driver The touchscreen controller is an 8 channel general purpose ADC with optional support for touchscreen conversions for a 4 5 8 wire resistive panel Please refer AM335x Touchscreen Driver s Guide for more details Power Management Refer to AM335x Linux Power Management User Guide for more details NAND Driver Please refer AM335x NAND Driver s Guide for more details AM335x PSP User s Guide PWM Driver Please refer AM335x PWM Driver s Guide for more details ADC Driver Please refer AM335x ADC Driver s Guide for more details RTC Driver AM335x has an internal RTC The driver for this present under lt kernel src gt drivers rtc rtc omap c The RTC driver conforms to the RTC framework in the kernel For more details on the RTC driver please refer to 7 rtc txt under kernel documentation folder Use the hwclock utility to test RTC The RTC device node created is dev rtcO If RTC is properly setup hwclock will return non zero time which is updated per second EVM On Board Components Drivers AM335x EVM supports components like temperature sensor and ambient light sensor Usage information on drivers for these components is available in EVM On Board Components Drivers Guide Modifying Pin Mux settings On AM335x devices the pins are tri s
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21. mple sources are included inside 4M335x PSP DIR examples examples MM mm pp bb tar gz Filesystem To boot up Linux a target filesystem is needed A filesystem is not included in PSP package It should be obtained 2 from SDK release Toolchain GNU toolchain for ARM processors from Arago is recommended Arago Toolchain can be found in the linux devkit directory of the SDK here 2 Environment Setup After installing the toolchain the environment in the Linux host needs to be setup 1 Set the environment variable PATH to contain the binaries of the Arago cross compiler tool chain For example in bash export PATH opt toolchain arago arago 2011 09 bin SPATH 2 Add the location of U Boot tools directory to the PATH environment variable required for mkimage utility that is built as part of U Boot build process and is needed to generate ulmage when building the kernel AM335x PSP User s Guide For example in bash export PATH opt u boot tools SPATH NOTE Actual commands to be used for setting the environment variables will depend upon the shell and location of the tools NOTE To help get started quickly the PSP package comes with pre built binaries However after making any changes to U Boot and or Linux Kernel they have to be cross compiled and the new binaries that are generated should be used Flashing Tools On AM335x EVM the Cortex A8 core boots up first On boot up the ARM core runs the U Boot ima
22. ose pins with input and output capabilities total 0 127 pins are available for usage GPIO Driver User Guide have more details of driver usage DCAN Driver DCAN Driver User Guide EDMAS Driver AM335x EDMA Driver s Guide Audio Driver The audio driver in the PSP package conforms to the ASoC framework in the Linux kernel The current driver supports audio capture and playback using the AIC3106 codec on the EVM For more details on the audio driver refer to the following page AM335x Audio Driver s Guide USB Driver The USB subsystem includes two USB Mentor Graphics USB2 0 OTG controller AM335X USB Driver User Guide 04 06 00 AM335x PSP User s Guide MMC SD driver MMC SD Driver supports MMC SD SDHC uSD cards HSMMC peripheral and driver has support for 4 data lines at the max operating frequency of 483MHz HSMMC is a slave DMA peripheral and uses EDMA to move data between SD card and system memory Please refer AM335x MMC SD Driver s Guide for more details McSPI Driver Please refer AM335x_PSP_McSPI_Driver_Guide pdf in the release package or refer online AM335x McSPI Driver s Guide Watchdog Timer WDT The following document covers the details regarding the watchdog timer in AM335x Please refer AM335x PSP WDT Driver User Guide CPSW Driver CPSW Common Platform Switch is a ethernet switch consisting of 3 MAC ports Please refer AM335x CPSW Ethernet Driver s Guide for more details LCD Fra
23. piling U Boot and the Linux kernel e Hosting the NFS server to boot the EVM with NFS as root filesystem Either of Windows or Linux host can be used for e Hosting the TFTP server required for downloading kernel and file system images from U Boot using Ethernet e Running a serial console terminal application AM335x PSP User s Guide PSP Package Contents IMPORTANT The values of MM mm pp and bb in this illustration will vary across the releases and actually depends on individual component versions Extract the contents of release package on Linux host with the following command S tar xvzf AM335x LINUX PSP MM mm pp bb tgz This creates a directory AM335x LINUX PSP MM mm pp bb with the following contents AM335x LINUX PSP MM mm pp bb AM335xPSP_Software_Manifest eet CLO AM335x_PSP_MM mm pp bb_Release_Notes pdf AM335x_PSP_User_Guide pdf AM335x_Audio_Driver_User_Guide pdf AM335x_EDMA_ Driver_User_Guide pdf AM IPSI_W BO Kc joche AMS Sore IPS IMCS IL _IDesk wre Siva CIS pE AM335x_PSP_MM mm pp bb_Feature_Performance_Guide pdf NMSS S25 IP SI _IMIMIC SID Sujojooicic s Pel AM335x_USB_User_Guide pdf IAMSS Oo ISIS MDL _Swhsojoouie q jevcke AMS 35x ISI IP Ileisilailins Toole Guide peT p lAOSic COOLS nand flash writer out keea si os El P Hie mecca i i omm olor ticker yz
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26. tated and set to Mode 0 or any other mode as required for specific module e g MMC in U Boot If a particular pin needs to be used for any other function than Mode 0 or override any other pin mode which was already set in U Boot there are 3 methods to do it Method I Modify Linux Kernel rebuilt and use Default mux mode can be changed by adding specific mux entry in the beginning of board_mux array in arch arm mach omap2 board am335xevm c or calling omap_mux_init_signal during initialization e g in device specific initialization function called from omap2_init_devices in arch arm mach omap2 devices c The names of multiplexed signals are specified in arch arm mach omap2 mux33xx c file in kernel source directory e g for setting xref_clk0 pin mode 0 to usb1_drvvbus mode 7 or FUNCTION 8 add AM33XX_MUX XREF_CLKO OMAP_MUX_MODE7 to board_mux structure in board file or call OuNeyo_ Who _slinahie_Syalepaayl Voeeue CULO wise Chavous 0 NOTE The string passed above should be modeO_name desired_mode_name format AM335x PSP User s Guide Method II Modify pin mux from arguments passed to Kernel The above API approach is useful if pin mux needs to setup at run time depending upon the board hardware detected without need of maintaining separate kernel binaries Alternatively particular pins can be setup by passing respective pinmux details to kernel command line in following format omap_mux lt mod
27. unt t debugfs none sys kernel debug e Change to clock directory under debugfs clock entries arranged exactly same as clock tree ie root clock gt child clock amp sibling clocks to see the details example 1 cd sys kernel debug clock root arago armv7 sys kernel debug clock ls 1 Ghaip lt ie ae 5 roor root Jama i 1970 Gllk_S2ZVo8_CGls drwxr xXr X 6 root root dem i 1970 elk res2k Ek drwara nea 2 POOL BOE O Jan 1 1970 ehrpwm0_tbclk driw na eA 2 POOL root Jan 1 1970 ehrpwml_tbclk TENKTE REX 2O root O Jan 1 1970 ehrpwm2_tbclk SSeS Sie iL roor root O Jan 1 1970 summary drwxr xXr xX 2 TOOK root QO dem i 1970 telkin ck ClieWipgie ee 2 TOO root 0 dem i 1970 virre t 2m clk Ghiniprgie Scie X 3 LOGU root O Ger i TOTO virt 24h ilk ENRERE 9 ZOO root Oo dem it i970 wire 29m Clk drwxr xXr xX 2 POOE root 0 Gem i 1970 waiec_26m_Clk root arago armv7 sys kernel debug clock example 2 AM335x PSP User s Guide 11 root arago armv7 cd sys kernel debug clock root arago armv7 sys kernel debug clock ls Cilk SZ 11518 _ k ehrpwml_tbclk tclkin_ck vaer 2S Clk SKETE S2 KECK chrpwm2 mt oeiki ree Ome eK ehrpwm0_tbclk summary Wale 24m ele root arago armv7 sys kernel debug clock cd clk_32768_ck root arago armv7 sys kernel debug clock clk_32768_ck 1s flags UCMR timerl_fck rate sysclkout_pre_ck usecount root arago armv7 sys kernel debug clock clk_32768_ck cat rate 32768 root ar
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