Vadim Bendebury
51f5875da6
cr50: usb_updater: include return codes into USB response payload
...
When vendor commands are processed by the TPM device, the result of
the command execution is communicated through the TPM response header.
When vendor commands are sent through USB the command execution result
value is lost, as the USB reply includes only the response payload,
(if any), but not the result value.
With this patch the single byte result value is prepended to the USB
response payload. The recipient will always look for the value in the
first byte of the response to find the vendor command execution
status.
The corresponding change to the Cr50 usb_updater will remove the
response code from the payload before considering the command's return
data.
BRANCH=cr50
BUG=b:35587387,b:35587053
TEST=verified proper existing extension commands processing (post
reset, turn update on) by the new version of usb_updater and
backwards compatibility with earlier Cr50 RW version (down to
0.0.13).
Change-Id: I5c8b3ea71d3cbbaccc06c909754944b3ab04675d
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org >
Reviewed-on: https://chromium-review.googlesource.com/525093
Reviewed-by: Aseda Aboagye <aaboagye@chromium.org >
2017-06-06 14:36:28 -07:00
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