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9bdde3e766
max_response_packet_size was incorrectly set to
response_size + SPI header/footer,
leading to the command handler to return EC_RES_OVERFLOW when the
response buffer size was set by the host to a larger size then
response_size.
It is happening since flashrom does not limit itself to 128 bytes
command since cl/264034.
The SHI repsone buffer is laid out as follow:
,.... out_msg_padded
/
|
|< SHI_OUT_START_PAD >|< SHI_MAX_RESPONSE_SIZE >|< SHI_OUT_END_PAD >|
+---+-----------------+-------------------------+-------------------+
| | | | |
+---+-----------------+-------------------------+-------------------+
| \
| -------
| \
| EC_SPI_FRAME_START_LENGTH
|
\..... out_msg
BUG=b:35571522,chromium:725580
BRANCH=gru
TEST=Before flashrom would fail:
cros_ec_set_max_size: sending protoinfo command
cros_ec_set_max_size: rc:12
cros_ec_set_max_size: max_write:536 max_read:163
...
Reading flash... __cros_ec_command_dev_v2(): Command 0x11 returned
result: 11
Ater, flashrom works:
cros_ec_set_max_size: sending protoinfo command
cros_ec_set_max_size: rc:12
cros_ec_set_max_size: max_write:536 max_read:160
...
Reading flash... done.SUCCESS
Verified that cros_ec.c/cros_ec_spi.c set some space for header and
footer in addition to max_response_packet_size.
Change-Id: I0de7ee5e8109e9277692113f2bb1d4a4758be9f6
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/520585
Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>
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