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b6991dd96d
Support protection of regions that aren't aligned to a power of 2 by using two MPU entries, and taking advantage of the sub-region feature. Also protect code RAM from being overwritten, on parts that use external storage. BUG=chromium:782244 BRANCH=None TEST=On kevin, call: mpu_protect_data_ram(); mpu_protect_code_ram(); mpu_enable(); Verify that first call results in the following update_region params: addr: 0x200c2000 size: 0xc01d Decoded: Protect 24K region Verify that second call results in the following params: addr: 0x100a8000 size: 0xc021 Decoded: Protect 96K region addr: 0x100c0000 size: 0xf01b Decoded: Protect remaining 8K region Also verify that writes to beginning and end of code ram region trigger data access violation after enabling protection. Also verify that sysjump fails. Change-Id: Ieb7a4ec3a089e8a2d29f231e1e3acf2e78e560a1 Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/757721 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly