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There were various longer discussions[0] over in gcc land and the consensus pretty much is that gcc's "armv6-m" shouldn't really exist, or rather map to its armv6s-m. Cortex-M0 is documented as having the svc instruction[1], and we make use of it, so let's go for armv6s-m as the safe option. We need that on some compilers (gcc 7, gcc 8.1.0) since they actually make that distinction. Newer ones won't, older ones apparently didn't. [0] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85606 https://sourceware.org/bugzilla/show_bug.cgi?id=23126 [1] http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0497a/BABBHFJE.html BUG=b:65441143 BRANCH=none TEST=builds with gcc 8.1 Change-Id: Ib0d5c484c2fbd72f033d8523cd1e0c6c8ce0c7e6 Signed-off-by: Patrick Georgi <pgeorgi@google.com> Reviewed-on: https://chromium-review.googlesource.com/1061073 Commit-Ready: Patrick Georgi <pgeorgi@chromium.org> Tested-by: Patrick Georgi <pgeorgi@chromium.org> Reviewed-by: Stefan Reinauer <reinauer@google.com>
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