7 Note: There are currently three variants of the TX51 module, that
8 require slightly different U-Boot configurations. They are
9 distinguished through the last digit of the module name
10 suffix. The configuration names depending on the last digit of
12 TX51-8??0 tx51-8xx0_config
13 TX51-8??1 tx51-8xx1_2_config
14 TX51-8??2 tx51-8xx1_2_config
21 tar -xjf /cdrom/U-Boot/u-boot-src.tar.bz2
23 Alternatively you can access the current source via the git repository:
24 git://git.kernelconcepts.de/karo-tx-uboot.git master
30 export CROSS_COMPILE=arm-cortexa8-linux-gnueabi-
31 make tx51-8xx?_config (see above Note!)
37 If you want to replace a working U-Boot with a new version, you can
38 load the new U-Boot image via TFTP and program it like any other flash
40 nand erase.part u-boot;nand write ${fileaddr} u-boot ${filesize}
42 If you want to revive a bricked module, you can use one of the
43 flashtools provided with the BSP to reprogram the flash.
49 Environment variables:
51 cpu_clk <CPU freq [MHz]> CPU clock frequency set after boot.
53 touchpanel {tsc2007|edt-ft5x06} type of touchpanel.
54 No touchpanel will be enabled when unset.
56 otg_mode [host|device|none] operation mode of the USBOTG port
58 video_mode <one of the display names from the Glyn Family Concept or
59 a video mode as understood by Linux fb_find_mode() function
60 (e.g.: 640x480MR-24@60)>
61 LCD interface will be disabled when unset.
63 baseboard {stk5-v3|stk5-v5} selects type of baseboard
64 'stk5-v5' setting disables USB Host mode on USBOTG port
65 and redefines the LCD0 pin as CAN transceiver control pin.
66 Strings not starting in 'stk5' prevent the STK5 specific
67 pad initialization to be done.
69 splashimage either: memory address (e.g. ${loadaddr}) of a BMP file
70 to be displayed instead of the built-in logo. Since NAND
71 flash is not accessible in a memory mapped fashion,
72 U-Boot will try to load the contents of the flash
73 partition 'logo.bmp' to the address given with
76 or: the name of an MTD partition, that contains a raw
77 dump of the frame buffer contents which will be loaded
80 splashpos (when 'splashimage' contains a memory address) the
81 position ('x,y') on the screen at which the BMP image
83 Setting splashpos to 'm,m' will center the image on the
86 Note: Some variables (like 'cpu_clk' or 'splashimage') may render the
87 board unbootable if incorrectly set. Therefore these variables
88 will not be evaluated in case the board has been reset through a
89 watchdog reset or <CTRL-C> is detected on the serial console
90 during startup to give the user a chance to recover from this
91 situation. You should press and hold <CTRL-C> before applying
92 power to the module, for this to work.