Vincent Palatin e18eb27f3a cortex-m: ensure we use the right subset of the instruction set ...

Cortex-M3 and Cortex-M4 are not using exactly the same instruction set.
Cortex-M3 is using ARMv7-M ISA which is a subset of the ARMv7E-M used by
the Cortex-M4 core (even though the delta is small).
Let's restrict each core to the right subset of instruction by pushing
the -mcpu/-march configuration in the chip specific area.

Note: GCC 4.8 is now using the full ARMv7E-M instruction set and will emit
"undefined instruction" on Cortex-M3 without this patch.

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

BRANCH=none
BUG=chromium:314194
TEST=build *and* run on Spring and Link.

Change-Id: I2f9b87fec689e8d1097809cab437a2bd32dfa194
Reviewed-on: https://chromium-review.googlesource.com/175487
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>

2013-11-02 01:07:20 +00:00

..

cortex-m

cortex-m: ensure we use the right subset of the instruction set

2013-11-02 01:07:20 +00:00

host

Fake I2C device support for emulator

2013-09-17 03:22:12 +00:00