Some mainboards have a header connected to the SPI bus, which can be
used to connect a second flash chip and override the onboard flash. This
allows one to boot coreboot on the system without ever having to flash
the onboard flash. HP boards with this header all seem to use the same
2x8 or 2x10 header layout, so document the pinout.
Change-Id: Ic2bf1244adfb78872340f212519c6ab33e26646a
Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67818
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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