• Mike Dunn's avatar
    pxa: palmtreo680 flash programming utility · 3497d432
    Mike Dunn authored
    This adds a userspace linux utility that writes the u-boot image to an mtd
    partition on the docg4 nand flash.
    A special utility is required to do this because u-boot is partially loaded by
    an initial program loader (IPL) that is permanently programmed to the boot
    region of the flash.  This IPL expects the image to be written in a unique
    format. The characteristics of this format can be summarized as follows:
      - Flash blocks to be loaded must have a magic number in the oob bytes of the
        first page of the block.
      - Each page must be written redundantly in the subsequent page.
      - The integrated flash controller's "reliable mode" is used, requiring that
        alternate 2k regions (4 pages) are skipped when writing.
    For these reasons, a u-boot image can not be written using nandwrite from
    Signed-off-by: default avatarMike Dunn <mikedunn@newsguy.com>
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