tree decf16fd518dbebbb816ab42e51f3064f027baf3
parent 12ade16cd7104e3a04384d9cabf88ee6220ca832
author Haojian Zhuang <haojian.zhuang@linaro.org> 1461207172 +0800
committer Haojian Zhuang <haojian.zhuang@linaro.org> 1461754360 +0800

Document: add MAX_IO_BLOCK_DEVICES platform macro

Add MAX_IO_BLOCK_DEVICES in porting guide. It's necessary to define
this macro to support io block device. With this macro, multiple
block devices could be opened at the same time. Each block device
stores its own state.

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