On Mon, Mar 20, 2017 at 6:36 AM, Sekhar Nori <nsek...@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 <ahas...@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: 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 > > 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 > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
