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da850: Add instructions to copy AIS image to NAND 

Add instructions to write an AIS image to NAND
by using the u-boot nand tools.

Signed-off-by: Axel Haslam <ahaslam@baylibre.com>
This commit is contained in:
ahaslam@baylibre.com 2017-03-17 16:55:23 +01:00 committed by Tom Rini
parent e5caec9a86
commit daa483debe
1 changed files with 41 additions and 0 deletions
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board/davinci/da8xxevm/README.da850
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@ -47,6 +47,47 @@ U-Boot > sf erase 0 +320000
U-Boot > tftp u-boot.ais
U-Boot > sf write c0700000 0 $filesize
Flashing the images to NAND
===========================
The AIS image can be written to NAND using the u-boot "nand" commands.
Example:
OMAPL138_LCDK requires the AIS image to be written to the second block of
the NAND flash.
From the "nand info" command we see that the second block would start at
offset 0x20000:
U-Boot > nand info
sector size 128 KiB (0x20000)
Page size 2048 b
From the tftp command we see that we need to copy 0x74908 bytes from
memory address 0xc0700000 (0x75000 if we align a page of 2048):
U-Boot > tftp u-boot.ais
Load address: 0xc0700000
Bytes transferred = 477448 (74908 hex)
The commands to write the image from memory to NAND would be:
U-Boot > nand erase 0x20000 0x75000
U-Boot > nand write 0xc0700000 0x20000 0x75000
Alternatively, MTD partitions may be defined. Using "mtdparts" to
conveniently have a bootloader partition starting at the second block
(offset 0x20000):
setenv mtdids nand0=davinci_nand.0
setenv mtdparts mtdparts=davinci_nand.0:128k(bootenv),2m(bootloader)
In this case the commands would be simplified to:
U-Boot > tftp u-boot.ais
U-Boot > nand erase.part bootloader
U-Boot > nand write 0xc0700000 bootloader
Flashing the images to MMC
==========================
If the boot pins are set to boot from mmc, the RBL will try to load the