cmd: pmic: add missing parameter 'value' for 'write' subcommand to help message

[karo-tx-uboot.git] / doc / README.mxs

diff --git a/doc/README.mxs b/doc/README.mxs
index 0235a5aeafad2b925e7b6dad08e0bc35e5e423bb..4edf19faab8d70170126aa3db5cb01d82eb2f139 100644 (file)
--- a/doc/README.mxs
+++ b/doc/README.mxs
@@ -1,4 +1,4 @@
-Booting U-boot on a MXS processor
+Booting U-Boot on a MXS processor
 =================================
 
 This document describes the MXS U-Boot port. This document mostly covers topics
@@ -23,6 +23,7 @@ Contents
 2) Compiling U-Boot for a MXS based board
 3) Installation of U-Boot for a MXS based board to SD card
 4) Installation of U-Boot into NAND flash on a MX28 based board
+5) Installation of U-Boot into SPI NOR flash on a MX28 based board
 
 1) Prerequisites
 ----------------
@@ -94,19 +95,19 @@ Next, configure U-Boot for a MXS based board
 
 Examples:
 
-1. For building U-boot for Denx M28EVK board:
+1. For building U-Boot for Denx M28EVK board:
 
        $ make m28evk_config
 
-2. For building U-boot for Freescale MX28EVK board:
+2. For building U-Boot for Freescale MX28EVK board:
 
        $ make mx28evk_config
 
-3. For building U-boot for Freescale MX23EVK board:
+3. For building U-Boot for Freescale MX23EVK board:
 
        $ make mx23evk_config
 
-4. For building U-boot for Olimex MX23 Olinuxino board:
+4. For building U-Boot for Olimex MX23 Olinuxino board:
 
        $ make mx23_olinuxino_config
 
@@ -218,7 +219,7 @@ There are two possibilities when preparing an image writable to NAND flash.
 
           This script expects a working TFTP server containing the file
           "u-boot.nand" in it's root directory. This can be changed by
-          adjusting the "update_nand_full_filename" varible.
+          adjusting the "update_nand_full_filename" variable.
 
           To update the system, run the following in U-Boot prompt:
 
@@ -241,7 +242,7 @@ There are two possibilities when preparing an image writable to NAND flash.
 
           This script expects a working TFTP server containing the file
           "u-boot.sb" in it's root directory. This can be changed by
-          adjusting the "update_nand_firmware_filename" varible.
+          adjusting the "update_nand_firmware_filename" variable.
 
           To update the system, run the following in U-Boot prompt:
 
@@ -262,3 +263,28 @@ There are two possibilities when preparing an image writable to NAND flash.
           In case the user needs to boot a firmware image bigger than 1Mb, the
           user has to adjust the "update_nand_firmware_maxsz" variable for the
           update scripts to work properly.
+
+5) Installation of U-Boot into SPI NOR flash on a MX28 based board
+------------------------------------------------------------------
+
+The u-boot.sb file can be directly written to SPI NOR from U-Boot prompt.
+
+Load u-boot.sb into RAM, this can be done in several ways and one way is to use
+tftp:
+       => tftp u-boot.sb 0x42000000
+
+Probe the SPI NOR flash:
+       => sf probe
+
+(SPI NOR should be succesfully detected in this step)
+
+Erase the blocks where U-Boot binary will be written to:
+       => sf erase 0x0 0x80000
+
+Write u-boot.sb to SPI NOR:
+       => sf write 0x42000000 0 0x80000
+
+Power off the board and set the boot mode DIP switches to boot from the SPI NOR
+according to MX28 manual section 12.2.1 (Table 12-2)
+
+Last step is to power up the board and U-Boot should start from SPI NOR.