i.MX NAND Boot: Make update robust against power failures

[Sascha Hauer]

The i.MX6 allows to store the barebox image and all control data around
it redundantly in the NAND. This can be used to make a barebox update
safe against power failures. The following series implements this. It
makes use of the just sent mtd-peb API.

Sascha

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Sascha Hauer (11):
      bbu: Allow to refresh/repair images
      mtd: nand: export nand_check_erased_buf
      imx-bbu-nand-fcb: factor out layout functions
      imx-bbu-nand-fcb: Use mtd-peb API to write firmware
      imx-bbu-nand-fcb: factor out a fcb write function
      imx-bbu-nand-fcb: erase on demand
      imx-bbu-nand-fcb: Only write FCBs/DBBTs when necessary
      imx-bbu-nand-fcb: When writing firmware return new bad blocks
      imx-bbu-nand-fcb: Print error when writing blocks fails
      imx-bbu-nand-fcb: Make robust against power cuts
      imx-bbu-nand-fcb: Print error message when out of pebs

 Documentation/user/updating.rst |   8 +
 commands/barebox-update.c       |  26 +-
 common/bbu.c                    |  12 +-
 common/imx-bbu-nand-fcb.c       | 968 +++++++++++++++++++++++++++++++++-------
 drivers/mtd/nand/nand_base.c    |   2 +-
 include/bbu.h                   |   1 +
 include/linux/mtd/nand.h        |   1 +
 7 files changed, 854 insertions(+), 164 deletions(-)