7 Note: There are currently two variants of the TX53 module, that
8 require slightly different U-Boot configurations. The mapping
9 between module names and U-Boot config make targets is as
12 Module Name U-Boot config target
13 =====================================
14 TX53-8030 tx53-x030_config'
15 TX53-8130 tx53-x130_config'
16 TX53-1030 tx53-x030_config'
17 TX53-1331 tx53-x131_config'
23 tar -xjf /cdrom/U-Boot/u-boot-src.tar.bz2
25 Alternatively you can access the current source via the git repository:
26 git://git.karo-electronics.de/karo-tx-uboot.git master
32 export CROSS_COMPILE=arm-cortexa8-linux-gnueabi-
33 make tx53-x?3?_config (see above Note!)
39 If you want to replace a working U-Boot with a new version, you can
40 load the new U-Boot image via TFTP and program it like any other flash
42 nand erase.part u-boot;nand write ${fileaddr} u-boot ${filesize}
44 If you want to revive a bricked module, you can use one of the
45 flashtools provided with the BSP to reprogram the flash.
51 Environment variables:
52 boot_mode selects which boot script will be used by 'bootcmd' to
53 boot the application (Linux)
55 nand: (default) load kernel from NAND partition 'linux'
56 and mount rootfs (fstype UBIFS)
57 from partition 'rootfs'.
58 mmc: load kernel from file 'uImage' on first
59 partition (FAT) on (first) SD/MMC card
60 and mount rootfs (fstype autodetected)
61 from second partition.
62 net: load kernel image via tftp (file uImage)
63 and mount rootfs via NFS. This requires
64 the additional variables 'nfsroot'
65 (path to rootfs on NFS server) and
66 'nfs_server' (hostname or IP address of
67 NFS server) to be set.
68 jffs2: (legacy) load kernel from NAND partition 'linux'
69 and mount rootfs (fstype JFFS2)
70 from partition 'rootfs'.
72 cpu_clk <CPU freq [MHz]> CPU clock frequency set after boot.
74 touchpanel {tsc2007|edt-ft5x06|egalax_ts} type of touchpanel.
75 No touchpanel will be enabled when unset.
77 otg_mode [host|device|none] operation mode of the USBOTG port
79 video_mode <one of the display names from the Glyn Family Concept or
80 a video mode as understood by Linux fb_find_mode() function
81 (e.g.: 640x480MR-24@60)>
82 LCD interface will be disabled when unset.
84 baseboard {stk5-v3|stk5-v5} selects type of baseboard
85 'stk5-v5' setting disables USB Host mode on USBOTG port
86 and redefines the LCD0 pin as CAN transceiver control pin.
87 Strings not starting in 'stk5' prevent the STK5 specific
88 pad initialization to be done.
90 splashimage either: memory address (e.g. ${loadaddr}) of a BMP file
91 to be displayed instead of the built-in logo. Since NAND
92 flash is not accessible in a memory mapped fashion,
93 U-Boot will try to load the contents of the flash
94 partition 'logo.bmp' to the address given with
97 or: the name of an MTD partition, that contains a raw
98 dump of the frame buffer contents which will be loaded
101 splashpos (when 'splashimage' contains a memory address) the
102 position ('x,y') on the screen at which the BMP image
104 Setting splashpos to 'm,m' will center the image on the
107 Note: Some variables (like 'cpu_clk' or 'splashimage') may render the
108 board unbootable if incorrectly set. Therefore these variables
109 will not be evaluated in case the board has been reset through a
110 watchdog reset or <CTRL-C> is detected on the serial console
111 during startup to give the user a chance to recover from this
112 situation. You should press and hold <CTRL-C> before applying
113 power to the module, for this to work.