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If init() is interrupted while we are setting the link to the compass, the BMI160 may be in paging mode and will only answer to registers 7Eh and 7Fh. Other registers access will return 00h. To get out of this state, run the sequence to move back from the paging mode in the error handler. If successful, a subsequent call to init() will work. BRANCH=smaug BUG=chrome-os-partner:45722 TEST=use a special firmware that exists in the middle of the compass init sequence. Check that the FIFO and all other registers return 0. Issue 'accelinit 1' (to reset the Gyro): the command succeeds and the accelerometer is operational again (double tap works). Check the sequence can be issued after sysjump to RW/RO. Change-Id: I3455a8cbdcf1c88699ae90f7c09e4438e1268d47 Signed-off-by: Gwendal Grignou <gwendal@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/308184 Reviewed-by: Alec Berg <alecaberg@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit