mb/Kconfig: Add a prompt string for MAINBOARD_PART_NUMBER

For some nissa variants, there are build configurations that need to use
different blobs, but otherwise are identical. Currently, they use the
same choice of board config and configure blob paths appropriately. This
avoids duplication within the Kconfig file, but the resulting firmware
images can be difficult to distinguish, since they report the same
FRID.

Add a prompt string for MAINBOARD_PART_NUMBER so it can be overridden
and round-tripped through make oldconfig, allowing customisation of the
reported FRID and other MAINBOARD_PART_NUMBER-derived values with
minimal overhead.

BUG=b:253966060
BRANCH=None
TEST=CL:3960290 MAINBOARD_PART_NUMBER configs apply successfully

Signed-off-by: Sam McNally <sammc@chromium.org>
Change-Id: I3497d7fa1c04c8fa2592025c771d9dbc65632e6e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68496
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Reka Norman <rekanorman@chromium.org>

0 files changed, 0 insertions, 0 deletions