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cortex-m: allow to lock/unlock empty MPU region

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When the MPU region to modify is empty (size == 0) returns EC_SUCCESS
rather than EC_ERROR_INVAL, so we are not failing MPU activation on
systems without anything in the .iram.text section.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=all
BUG=chrome-os-partner:35774
TEST=on Samus, with WP, try "sysjump disable" on the EC command line
and see "RAM locked. Exclusion 20006ee0-20006ee0" message.

Change-Id: I0103e0f7aa81ee64a70dd47ffb1c50067ce5a6ee
Reviewed-on: https://chromium-review.googlesource.com/242690
Trybot-Ready: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
This commit is contained in:
Vincent Palatin
2015-01-22 14:21:32 -08:00
committed by ChromeOS Commit Bot
parent 4a8ce9ac34
commit 3df8bd8772
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
core/cortex-m/mpu.c
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@@ -64,7 +64,7 @@ static int mpu_config_region(uint8_t region, uint32_t addr, uint32_t size,
int size_bit = 0;
if (!size)
return -EC_ERROR_INVAL;
return EC_SUCCESS;
while (!(size & 1)) {
size_bit++;
size >>= 1;