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Due to the limitation of servo that is unable to send U keys, dev USB boot (triggered by Ctrl-U) is unable to be tested on FAFT. To solve it, firmware should add an addition key combination to workaround it. Ctrl-Enter is the one we picked. BUG=chrome-os-partner:6759 TEST=compile the firmware and update it to Lumpy; during the dev screen, press Ctrl-Enter to trigger USB boot. Change-Id: I8215a241c3c07dc2f5e194c324459f106d007f47 Reviewed-on: https://gerrit.chromium.org/gerrit/15749 Reviewed-by: Randall Spangler <rspangler@chromium.org> Commit-Ready: Tom Wai-Hong Tam <waihong@chromium.org> Tested-by: Tom Wai-Hong Tam <waihong@chromium.org>
arch/ is stuff that defines the architecture-dependent information (only used in firmware build mode). lib/ is stuff that the BIOS needs to link with. stub/ is stuff to be implemented by the BIOS. include/ describes the interfaces between the two parts.