X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=doc%2FREADME.KARO-TX48;h=ed50e81f8d5f0b9ce4fc742024528fa63fe889ab;hb=717626fd1cd3a9dd3de451405d97f67a7c707d89;hp=74d465dba7e890fadfb22998cbdbe35bb8134058;hpb=bb0f32d0bad65fc6948ce6032f9004a70e11fef4;p=karo-tx-uboot.git

diff --git a/doc/README.KARO-TX48 b/doc/README.KARO-TX48
index 74d465dba7..ed50e81f8d 100644
--- a/doc/README.KARO-TX48
+++ b/doc/README.KARO-TX48
@@ -10,6 +10,10 @@ mkdir u-boot
 cd u-boot
 tar -xjf /cdrom/U-Boot/u-boot-src.tar.bz2
 
+Alternatively you can access the current source via the git repository:
+git://git.karo-electronics.de/karo-tx-uboot.git master
+
+
 Compiling U-Boot
 ----------------
 export ARCH=arm
@@ -35,21 +39,45 @@ 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.: 640x480MR-24@60
+cpu_clk       <CPU freq [MHz]> CPU clock frequency set after boot.
+
+touchpanel    {tsc2007|edt-ft5x06|am3359-tscadc} type of touchpanel.
+	      No touchpanel will be enabled when unset.
+
+otg_mode      [host|device|none] operation mode of the USBOTG port
+
+video_mode    <one of the display names from the Glyn Family Concept or
+	      a video mode as understood by Linux fb_find_mode() function
+              (e.g.: 640x480MR-24@60)>
+	      LCD interface will be disabled when unset.
+
 baseboard     {stk5-v3|stk5-v5} selects type of baseboard
-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'.
+	      'stk5-v5' setting disables USB Host mode on USBOTG port
+	      and redefines the LCD0 pin as CAN transceiver control pin.
+	      Strings not starting in 'stk5' prevent the STK5 specific
+	      pad initialization to be done.
+
+splashimage   either: memory address (e.g. ${loadaddr}) 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.bmp' to the address given with
+	      'splashimage'.
+
+	      or: the name of an MTD partition, that contains a raw
+	      dump of the frame buffer contents which will be loaded
+	      to the framebuffer.
+
+splashpos     (when 'splashimage' contains a memory address) the
+	      position ('x,y') on the screen at which the BMP image
+	      will be displayed.
+	      Setting splashpos to 'm,m' will center the image on the
+	      screen.
 
 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
+      watchdog reset or <CTRL-C> is detected on the serial console
       during startup to give the user a chance to recover from this
-      situation.
+      situation. You should press and hold <CTRL-C> before applying
+      power to the module, for this to work.