ichspi: Expose flash descriptor regions through get_region()

Region attributes are now stored in a `fd_regions` array after being
decoded in ich9_handle_frap() and used by ich_get_region().

A special cases is handled in ich_get_region(): if there is a gap
between two flash regions, an artificial region is created to fill the
gap. I.e. any address inside the gap will return a region that spans the
gap between the end the of the previous region and the start of the next
region. This allows ich_get_region() to be used to iterate the entire
flash region-by-region.

Read and write operations are assumed to be allowed inside gaps between
regions.

BUG=b:260440773
BRANCH=none
TEST=flashrom -{r,w,E,v} on dedede (JSL)

Change-Id: I019f3f407f6a2a82f686a168457e0e32961ff483
Signed-off-by: Nikolai Artemiev <nartemiev@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/70127
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions