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. Thanks, Sekhar _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
