tree 2f79193caff0fc5f93933bfee19c7699d0b98db4
parent c476155c46c77c00c4c43372dd1d3af54c9c3d4c
author Haojian Zhuang <haojian.zhuang@linaro.org> 1458285259 +0800
committer Haojian Zhuang <haojian.zhuang@linaro.org> 1461754318 +0800

IO: support block device type

FIP is accessed as memory-mapped type. eMMC is block device type.
In order to support FIP based on eMMC, add the new io_block layer.

io_block always access eMMC device as block size. And it'll only
copy the required data into buffer in io_block driver. So preparing
an temporary buffer is required.

When use io_block device, MAX_IO_BLOCK_DEVICES should be declared
in platform_def.h. It's used to support multiple block devices.

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>