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 7c1af17..be7ef32 100644
--- a/doc/README.mpc8313erdb
+++ b/doc/README.mpc8313erdb
@@ -15,6 +15,18 @@
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 @@
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 @@
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 @@
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 @@
6 Notes
- Booting from NAND flash is not yet supported.
The console baudrate for MPC8313ERDB is 115200bps.