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Vincent Palatin 3df8bd8772 cortex-m: allow to lock/unlock empty MPU region 
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>
2015-01-23 19:56:17 +00:00
board
glower: Set internal VCC_PWRGD to high
2015-01-23 00:28:40 +00:00
chip
lm4: ignore overlapping LPC commands
2015-01-23 00:28:45 +00:00
common
charge state v2: Initialize batt params before inhibiting power-on
2015-01-22 21:15:02 +00:00
core
cortex-m: allow to lock/unlock empty MPU region
2015-01-23 19:56:17 +00:00
driver
pi3usb9281: Lock access to MUX GPIO while in use
2015-01-21 06:44:41 +00:00
extra
USB-console: Add Linux USB serial kernel module
2014-10-29 18:38:27 +00:00
include
pd: retrieve logs from accessories
2015-01-21 06:44:33 +00:00
power
Rockchip: Wait till we actually power down in power_off()
2015-01-23 19:55:54 +00:00
test
charger: Make critical battery shutdown timeout a config option
2015-01-15 05:13:14 +00:00
util
flash_ec: fixing servo v3 support for beaglebone
2015-01-23 00:28:49 +00:00
.gitignore
Add TAGS and cscope.* to .gitignore
2014-03-31 22:45:09 +00:00
COMMIT-QUEUE.ini
Ignore failures in HWTest and VMTest in the commit queue.
2013-11-01 14:08:36 +00:00
LICENSE
Add LICENSE file to project
2012-05-11 09:11:52 -07:00
Makefile
twinkie: build a combined firmware
2015-01-08 23:55:58 +00:00
Makefile.rules
nuc: Add all IC specific drivers of NPCX5M5G
2015-01-14 03:16:10 +00:00
Makefile.toolchain
twinkie: build a combined firmware
2015-01-08 23:55:58 +00:00
OWNERS
Add OWNERS files
2014-04-02 19:58:53 +00:00
PRESUBMIT.cfg
Add presubmit check for unit test
2014-02-06 19:27:18 +00:00
README
Add standalone lightbar simulation tool
2014-05-15 05:20:14 +00:00
README.fmap
Update EC config and FMAP to reserve room for vboot signatures
2012-05-04 14:42:58 -07:00

README 

For an overview of the Embedded Controller firmware, refer to

http://www.chromium.org/chromium-os/2014-firmware-summit
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