mpc8313erdb: Document NAND boot.

Previously, the documentation claimed that NAND boot is not supported.
This is no longer true.

Signed-off-by: Scott Wood <scottwood@freescale.com>

diff --git a/doc/README.mpc8313erdb b/doc/README.mpc8313erdb
index 7c1af17c509c1dcfa1538b3b7c7f338bdb8c478c..be7ef32b45fb8e0f6ba58d7737ac1035a703ced2 100644 (file)
--- a/doc/README.mpc8313erdb
+++ b/doc/README.mpc8313erdb
@@ -15,6 +15,18 @@ Freescale MPC8313ERDB Board
          4321            4321
        (where the '*' indicates the position of the tab of the switch.)
 
+       To boot the image at the beginning of NAND flash, use these
+       DIP switch settings for S3 S4:
+
+       +------+        +------+
+       | *    |        |  *** |
+       |  *** |        | *    |
+       +------+ ON     +------+ ON
+         4321            4321
+       (where the '*' indicates the position of the tab of the switch.)
+
+       When booting from NAND, use u-boot-nand.bin, not u-boot.bin.
+
 2.     Memory Map
        The memory map looks like this:
 
@@ -29,6 +41,9 @@ Freescale MPC8313ERDB Board
                                        LED Control (CS3)
        0xfe00_0000     0xfe7f_ffff     NOR FLASH (CS0)  8M
 
+       When booting from NAND, NAND flash is CS0 and NOR flash
+       is CS1.
+
 3.     Definitions
 
 3.1    Explanation of NEW definitions in:
@@ -45,15 +60,20 @@ Freescale MPC8313ERDB Board
 
        export CROSS_COMPILE=your-cross-compiler-prefix-
        make distclean
-       make MPC8313ERDB_33_config
-       (or make MPC8313ERDB_66_config, depending on the speed of
-        the oscillator on your board)
+       make MPC8313ERDB_XXX_config
+       (where XXX is:
+          33 - 33 MHz oscillator, boot from NOR flash
+          66 - 66 MHz oscillator, boot from NOR flash
+          NAND_33 - 33 MHz oscillator, boot from NAND flash
+          NAND_66 - 66 MHz oscillator, boot from NAND flash)
        make
 
 5.     Downloading and Flashing Images
 
 5.1    Reflash U-boot Image using U-boot
 
+       NOR flash:
+
        =>run tftpflash
 
        You may want to try
@@ -63,6 +83,15 @@ Freescale MPC8313ERDB Board
        have an alternate means of programming the flash available
        if the new u-boot doesn't boot.
 
+       NAND flash:
+
+       =>tftpboot $loadaddr <filename>
+       =>nand erase 0 0x80000
+       =>nand write $loadaddr 0 0x80000
+
+       ...where 0x80000 is the filesize rounded up to
+       the next 0x20000 increment.
+
 5.2    Downloading and Booting Linux Kernel
 
        Ensure that all networking-related environment variables are set
@@ -79,5 +108,4 @@ Freescale MPC8313ERDB Board
 
 6      Notes
 
-       Booting from NAND flash is not yet supported.
        The console baudrate for MPC8313ERDB is 115200bps.