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This commit adds two new commands to the serprog protocol which allow more fine grained control over the SPI bus. This enables more applications over serprog like e.g. flashing AVR microcontrollers. This can be tried with my forks of pico-serprog: https://github.com/funkeleinhorn/pico-serprog/tree/spimode and avrdude: https://github.com/funkeleinhorn/avrgirl/tree/serprog-programmer I announced this change in flashrom and flashprog IRC channels and got overall positive feedback in the flashprog channel. The same changes will be sent to flashprog to prevent diverging specs. Change-Id: Idb5a9a3710fede322def5191d68b7fba0e135292 Signed-off-by: Funkeleinhorn <git@funkeleinhorn.com> Reviewed-on: https://review.coreboot.org/c/flashrom/+/81428 Reviewed-by: Anastasia Klimchuk <aklm@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>