common/partitions/efi: fix gpt detection ...

On some boards (such as i.MX) the buffer might contain both:
A barebox image *and* a GPT partition table.

Thus, irrelevant filetypes should be ignored.

partitions: efi: Constify force_gpt ...

No one is modifying 'force_gpt', so constify it to reflect that fact.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

include: move crc specific stuff to crc.h ...

We have a crc.h, so move our crc function prototypes there to further
cleanup common.h.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

partitions/efi: Add partuuid to partition description ...

In commit bc31d85 the partition UUID
was added to the partition struct and thence to the cdev(s) for the
partition.  But just for DOS partitions.  Do this for GPT aka EFI
partitions too.

Signed-off-by: Trent Piepho <tpiepho@kymetacorp.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

partitions/efi: Fix off-by-one error in 'last_lba' ...

LBAs are numbered starting from zero so the last LBA # would be equal
to total number of blocks minus one.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Add initial EFI architecture support ...

This adds support for running barebox in an EFI environment
on X86 PC hardware.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

block: implement block_read/block_write functions ...

Some drivers use blk->ops->read/write. This bypasses the caching block
layer and was never intended like this. The upper API to the block layer
is the cdev layer. This patch adds block_read and block_write functions
and uses them where appropriate.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

disk: partitions: add EFI GUID Partition Table ...

form linux 3.8

so you can have part by num or name
not by GUID as this is a non human reading name

     `---- ffe08000.sata
          `---- 0x00000000-0x3fffffff: /dev/ata0
          `---- 0x00100000-0x063fffff: /dev/ata0.0
          `---- 0x00100000-0x063fffff: /dev/ata0.boot
          `---- 0x06400000-0x3fefffff: /dev/ata0.1
          `---- 0x06400000-0x3fefffff: /dev/ata0.linux

Cc: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>