util/cbfstool: Add "expand" command to make CBFS span an fmap region
vboot images come with multiple regions carrying CBFS file systems. To expedite hashing (from slow flash memory), the FW_MAIN_* regions are truncated since they typically have pretty large unused space at the end that is of no interest. For test purposes it can be useful to re-engage that space, so add a command that creates a new empty file entry covering that area (except for the last 4 bytes for the master header pointer, as usual). BUG=b:65853903 BRANCH=none TEST=`cbfstool test.bin expand -r FW_MAIN_A` creates a new empty file of the expected size on a Chrome OS firmware image. Change-Id: I160c8529ce4bfcc28685166b6d9035ade4f6f1d1 Signed-off-by: Patrick Georgi <pgeorgi@google.com> Reviewed-on: https://review.coreboot.org/21598 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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@@ -80,6 +80,10 @@ int cbfs_copy_instance(struct cbfs_image *image, struct buffer *dst);
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* beginning of the image. Returns 0 on success, otherwise non-zero. */
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int cbfs_compact_instance(struct cbfs_image *image);
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/* Expand a CBFS image inside an fmap region to the entire region's space.
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Returns 0 on success, otherwise non-zero. */
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int cbfs_expand_to_region(struct buffer *region);
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/* Releases the CBFS image. Returns 0 on success, otherwise non-zero. */
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int cbfs_image_delete(struct cbfs_image *image);
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