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0d6b9ad7bd
Whenever we're sending raw status bytes from the EC(while the we're not DMAing)
the bytes kinda get garbled, and not get sent in the right order. Sometimes we
want the last byte sent to keep repeating, the problem is that it doesn't.
Seems like the tx fifo doesn't play nice with the DMA. The way we fix this is by
sending bytes 4 times, effectively bypassing the TX fifo.
Protocol v2 was not fixed yet. It just displays a warning if one tries to use it
on F0.
BUG=chrome-os-partner:31390
BRANCH=None
TEST=ectool version should work in the most recent kernel(with the v3 protocol
version). spidev/python "s.transfer("\xdc\x02\x00\xde"+"\x00"*100)" should
return a deterministic packet(the only variation between calls should be the
number of \xfa recieved(40 vs 41 or so)).
"flashrom -p ec -l /tmp/layout.txt -i rw:/tmp/rw.bin -w -V" now works properly.
Change-Id: Ia2772277428bd45013f5721a6bedab13d0591423
Signed-off-by: Alexandru M Stan <amstan@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/217083
Reviewed-by: Randall Spangler <rspangler@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit