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cli-classic: Add new '--fmap-verify' option

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Add a new layout option, --fmap-verify, to be used when writing to
flash, which will compare the FMAP on the flash chip to the one in
the file being flashed, and abort if there are any differences.
The comparison ensures that number of regions and start/end addresses
are all identical.

Add documentation for the new option as well.

TEST: tested with the following commands:
flashrom -p internal -r coreboot.rom --fmap-verify -i COREBOOT (fails w/error)
flashrom -p internal -v coreboot.rom --fmap-verify -i COREBOOT (fails w/error)
flashrom -p internal -r coreboot.rom --fmap -i COREBOOT (ok)
flashrom -p internal -w coreboot.rom --fmap-verify -i COREBOOT (fails w/error - no FMAP)
flashrom -p internal -r coreboot.rom (fails w/error, active ME)
flashrom -p internal -r coreboot.rom --ifd -i bios (ok)
flashrom -p internal -w coreboot.rom --fmap-verify -i COREBOOT -N (ok)

Change-Id: I34f69d848869cf236b7e57cf8f60c2aaad79c385
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/89536
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
This commit is contained in:
Matt DeVillier
2025-10-12 17:46:42 -05:00
committed by Anastasia Klimchuk
parent b0b975d0ea
commit bc3f2f84f9
4 changed files with 104 additions and 8 deletions
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21
doc/release_notes/devel.rst
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@@ -38,6 +38,27 @@ If you are flashing multiple regions or ones that partially overlap with
read-only parts then that could result in flashrom failing in the
middle, leaving you in unknown state.
FMAP verification support
--------------------------
A new ``--fmap-verify`` option has been added that allows verification of FMAP
(Flash Map) layout compatibility before performing write operations. This option
reads the FMAP layout from both the flash ROM and the file to be written, then
compares them to ensure they match before proceeding with the write.
This is particularly useful when updating specific regions (e.g., COREBOOT) to
prevent accidentally writing a ROM image with an incompatible layout that could
result in a bricked system. The ``--fmap-verify`` option is mutually exclusive
with ``--fmap``, ``--fmap-file``, ``--layout``, and ``--ifd`` options, and can
only be used with write operations (``-w``).
Example usage::
flashrom -p programmer --fmap-verify -w newimage.rom --image COREBOOT
If the FMAP layouts don't match, the operation will abort with a detailed error
message showing which regions differ.
New programmers
===============