It's impossible for flashrom_layout to represent zero-sized flash regions but it is possible for a fmap to contain a zero-sized region which causes the resulting layout to fail layout_sanity_checks(), preventing use of that fmap. Because it would very rarely make sense to be able to operate on zero-sized regions anyway and changing layouts to be able to support zero-size regions would entail large changes, instead ignore zero-size regions when present in fmap. TEST=Warning is now printed when using fmap that contains a zero-sized area, and operations on other regions are allowed to proceed. BUG=b:271933192 Change-Id: Ie20971f779acece7a0b3b8f38796fff128ce689a Signed-off-by: Peter Marheine <pmarheine@chromium.org> Reviewed-on: https://review.coreboot.org/c/flashrom/+/73571 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Thomas Heijligen <src@posteo.de> Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>