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>