- Building & Flashing U-Boot for TX53
- ===================================
+ U-Boot for TX53
+ ===============
Building U-Boot
---------------
If you want to revive a bricked module, you can use one of the
flashtools provided with the BSP to reprogram the flash.
+
+
+U-Boot Features
+---------------
+
+Environment variables:
+
+cpu_clk <CPU freq [MHz]>
+touchpanel {tsc2007|edt-ft5x06}
+otg_mode [host|device|none]
+video_mode <video mode as understood by Linux fb_find_mode() function>
+ e.g.: VGA-1:640x480MR-24@60
+baseboard {stk5-v3|stk5-v5} selects type of baseboard
+ 'stk5-v5' setting enables CAN transceiver switch on GPIO4_21 and
+ disables USB Host mode on USBOTG port.
+ strings not starting in 'stk5' prevent the STK5 specific
+ pad initialization to be done.
+splashimage memory address of a BMP file to be displayed instead of
+ the built-in logo. Since NAND flash is not accessible in
+ a memory mapped fashion, U-Boot will try to load the
+ contents of the flash partition 'logo' to the address
+ given with 'splashimage'.
+
+Note: Some variables (like 'cpu_clk' or 'splashimage') may render the
+ board unbootable if incorrectly set. Therefore these variables
+ will not be evaluated in case the board has been reset through a
+ watchdog reset or a character is available on the serial console
+ during startup to give the user a chance to recover from this
+ situation.