Gwendal Grignou 2590ce9538 common: Add software CTZ implementation when needeed
CTZ - Count Trailing Zero - is not implemented in hardware on cortex0 or
nds32.

Used in ST sensor drivers.

BUG=none
BRANCH=none
TEST=compile

Change-Id: I2d62fd60f05169189b24ba2a3308bec69ed9de9c
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/767609
Commit-Ready: Ely Vazquez <nadia198877@gmail.com>
Reviewed-by: Shawn N <shawnn@chromium.org>
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2014-04-02 19:58:53 +00:00
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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
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