mxs: spl: replace bogus early_delay() function with standard udelay() calls

[karo-tx-uboot.git] / doc / README.KARO-TX51

diff --git a/doc/README.KARO-TX51 b/doc/README.KARO-TX51
index 078e8362ef7047eb4ac32aae0d6a9b38bde2dedb..30c9f1e32bc7466ed35f8d8e5d05b3eab87bf9fb 100644 (file)
--- a/doc/README.KARO-TX51
+++ b/doc/README.KARO-TX51
@@ -7,14 +7,12 @@ Building U-Boot
 Note: There are currently three variants of the TX51 module, that
       require slightly different U-Boot configurations. They are
       distinguished through the last digit of the module name
-      suffix. The following table lists the module names and the
-      corresponding U-Boot configuration name:
+      suffix. The configuration names depending on the last digit of
+      the module name are:
+      TX51-8??0                 tx51-8xx0_config
+      TX51-8??1                 tx51-8xx1_2_config
+      TX51-8??2                 tx51-8xx1_2_config
 
-      Module Name              U-Boot config
-      ---------------------------------------
-      TX51-8xx0                        tx51-8xx0_config
-      TX51-8xx1                        tx51-8xx1_2_config
-      TX51-8xx2                        tx51-8xx1_2_config
 
 Unpacking the source
 --------------------
@@ -23,7 +21,7 @@ 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.kernelconcepts.de/karo-tx-uboot.git master
+git://git.karo-electronics.de/karo-tx-uboot.git master
 
 
 Compiling U-Boot
@@ -49,16 +47,44 @@ U-Boot Features
 ---------------
 
 Environment variables:
+boot_mode     selects which boot script will be used by 'bootcmd' to
+             boot the application (Linux)
+             supported values:
+             nand: (default) load kernel from NAND partition 'linux'
+                             and mount rootfs (fstype UBIFS)
+                             from partition 'rootfs'. 
+             mmc:            load kernel from file 'uImage' on first
+                             partition (FAT) on (first) SD/MMC card
+                             and mount rootfs (fstype autodetected)
+                             from second partition.
+             net:            load kernel image via tftp (file uImage)
+                             and mount rootfs via NFS. This requires
+                             the additional variables 'nfsroot'
+                             (path to rootfs on NFS server) and
+                             'nfs_server' (hostname or IP address of
+                             NFS server) to be set.
+             jffs2: (legacy) load kernel from NAND partition 'linux'
+                             and mount rootfs (fstype JFFS2)
+                             from partition 'rootfs'.
+
+cpu_clk       <CPU freq [MHz]> CPU clock frequency set after boot.
+
+touchpanel    {tsc2007|edt-ft5x06} 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.
 
-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 disables USB Host mode on USBOTG port.
-             strings not starting in 'stk5' prevent the STK5 specific
+             '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,
@@ -79,6 +105,7 @@ splashpos     (when 'splashimage' contains a memory address) the
 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.