On Mon, Mar 20, 2017 at 6:36 AM, Sekhar Nori nsekhar@ti.com wrote:
Hi Axel,
On Friday 17 March 2017 09:25 PM, Axel Haslam wrote:
Add instructions to write an AIS image to NAND by using the u-boot nand tools.
Signed-off-by: Axel Haslam ahaslam@baylibre.com
Changes in V2:
- add erase command before write
- Add write info when MTD partitions are defined
board/davinci/da8xxevm/README.da850 | 41 +++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+)
diff --git a/board/davinci/da8xxevm/README.da850 b/board/davinci/da8xxevm/README.da850 index 29cb4ec..519267e 100644 --- a/board/davinci/da8xxevm/README.da850 +++ b/board/davinci/da8xxevm/README.da850 @@ -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: 0xc0700000Bytes 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
Looks good to me now.
Perhaps the mtdparts setting above can be part of the default environment itself ? So the additional step of setting them up can be avoided. But that will be a separate patch.
Yes, agree. i will send a patch for that. -Regards Axel.
Thanks, Sekhar