11 tar -xjf /cdrom/U-Boot/u-boot-src.tar.bz2
13 Alternatively you can access the current source via the git repository:
14 git://git.karo-electronics.de/karo-tx-uboot.git master
20 export CROSS_COMPILE=arm-cortexa8-linux-gnueabi-
27 If you want to replace a working U-Boot with a new version, you can
28 load the new U-Boot image via TFTP and program it like any other flash
30 nand erase.part u-boot;nand write.trimffs ${fileaddr} u-boot ${filesize}
32 If you want to revive a bricked module, U-Boot can be downloaded via
33 xmodem protocol over the serial port in recovery boot mode (Jumper ST3
34 on Starterkit-5 baseboard closed). See TX48-U-Boot.pdf for details.
40 Environment variables:
42 cpu_clk <CPU freq [MHz]> CPU clock frequency set after boot.
44 touchpanel {tsc2007|edt-ft5x06|am3359-tscadc} type of touchpanel.
45 No touchpanel will be enabled when unset.
47 otg_mode [host|device|none] operation mode of the USBOTG port
49 video_mode <one of the display names from the Glyn Family Concept or
50 a video mode as understood by Linux fb_find_mode() function
51 (e.g.: 640x480MR-24@60)>
52 LCD interface will be disabled when unset.
54 baseboard {stk5-v3|stk5-v5} selects type of baseboard
55 'stk5-v5' setting disables USB Host mode on USBOTG port
56 and redefines the LCD0 pin as CAN transceiver control pin.
57 Strings not starting in 'stk5' prevent the STK5 specific
58 pad initialization to be done.
60 splashimage either: memory address (e.g. ${loadaddr}) of a BMP file
61 to be displayed instead of the built-in logo. Since NAND
62 flash is not accessible in a memory mapped fashion,
63 U-Boot will try to load the contents of the flash
64 partition 'logo.bmp' to the address given with
67 or: the name of an MTD partition, that contains a raw
68 dump of the frame buffer contents which will be loaded
71 splashpos (when 'splashimage' contains a memory address) the
72 position ('x,y') on the screen at which the BMP image
74 Setting splashpos to 'm,m' will center the image on the
77 Note: Some variables (like 'cpu_clk' or 'splashimage') may render the
78 board unbootable if incorrectly set. Therefore these variables
79 will not be evaluated in case the board has been reset through a
80 watchdog reset or <CTRL-C> is detected on the serial console
81 during startup to give the user a chance to recover from this
82 situation. You should press and hold <CTRL-C> before applying
83 power to the module, for this to work.