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Document: add MAX_IO_BLOCK_DEVICES platform macro

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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>
This commit is contained in:
Haojian Zhuang
2016-04-21 10:52:52 +08:00
parent 9da7a653bd
commit 08b375b0f1
1 changed files with 8 additions and 0 deletions
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8
docs/porting-guide.md
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@@ -448,6 +448,14 @@ must also be defined:
Defines the maximum number of open IO handles. Attempting to open more IO
entities than this value using `io_open()` will fail with -ENOMEM.
* **#define : MAX_IO_BLOCK_DEVICES**
Defines the maximum number of registered IO block devices. Attempting to
register more devices this value using `io_dev_open()` will fail
with -ENOMEM. MAX_IO_BLOCK_DEVICES should be less than MAX_IO_DEVICES.
With this macro, multiple block devices could be supported at the same
time.
If the platform needs to allocate data within the per-cpu data framework in
BL31, it should define the following macro. Currently this is only required if
the platform decides not to use the coherent memory section by undefining the