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In the field, we want to update touchpad FW using the same USB update protocol as the main EC FW. To distinguish between EC FW update and touchpad FW update, we use a virtual address, defined by CONFIG_TOUCHPAD_VIRTUAL_OFF, that does not map to anything on the EC chip. Also, this will allow us to verify hashes of each block of the flashed touchpad firmware, so that we can ensure its integrity before flashing it into the touchpad. A stub is implemented in update_fw.c:contents_allowed. BRANCH=none BUG=b:63993173 TEST=With follow-up CLs, ./usb_updater2 -p 144.0_2.0.bin Change-Id: I4de1d7d138fc01fe1552a4173c8ef208ecb834a7 Signed-off-by: Nicolas Boichat <drinkcat@google.com> Reviewed-on: https://chromium-review.googlesource.com/593373 Commit-Ready: Nicolas Boichat <drinkcat@chromium.org> Tested-by: Nicolas Boichat <drinkcat@chromium.org> Reviewed-by: Chun-ta Lin <itspeter@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