Describe state and assuptions made about x86_64 support.
Change-Id: I308a09b0eac269afd30df95ed3ea195238a6cfbe
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/c/30056
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>