[PATCH] fix i.MX external NAND boot bad block handling

[Sascha Hauer]

The i.MX external NAND boot code relied very much on all block
used for the bootloader are good. It has some bad block checking,
but unfortunately it tested for a bad block in each page of a
block and skipped this page instead of checking for a bad block
at the beginning of a block and skipping the whole block then.

The handling of 2k page NAND flashes has another problem with bad
blocks. We rely on a bad block table since we cannot properly keep
the BBM on flash. This also means that the external NAND boot code
cannot detect bad blocks. This series adds a barebox update handler
to generate a bad block table (well, as long as we consider a 32bit
bitmask a table ;) inside the initial 2k page.

Sascha

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Sascha Hauer (4):
      ARM: i.MX: external nand boot: check for bad blocks
      ARM: head: Add some space behind the image header
      ARM: i.MX: Add bbu handler for external NAND boot
      ARM: i.MX pcm043: register external nand boot handler

 arch/arm/boards/pcm043/pcm043.c           |   6 +
 arch/arm/include/asm/barebox-arm-head.h   |  10 ++
 arch/arm/mach-imx/Kconfig                 |   6 +
 arch/arm/mach-imx/Makefile                |   1 +
 arch/arm/mach-imx/external-nand-boot.c    |  59 +++++++--
 arch/arm/mach-imx/imx-bbu-external-nand.c | 204 ++++++++++++++++++++++++++++++
 arch/arm/mach-imx/include/mach/bbu.h      |  11 ++
 arch/arm/mach-imx/include/mach/imx-nand.h |   6 +
 8 files changed, 289 insertions(+), 14 deletions(-)
 create mode 100644 arch/arm/mach-imx/imx-bbu-external-nand.c