image_types_verity.bbclass: add FEC support

dm-verity can use Reed-Solomon forward error correction (FEC) data
to transparently recover a limited number of corrupted blocks instead
of only detecting them. This can be useful for mitigating error-prone
storage.

We generate this FEC data as an option, controlled by VERITY_FEC
(default off, same behavior as before) and VERITY_FEC_ROOTS (number of
Reed-Solomon roots, default 2). The FEC data is appended to the hash
tree by default. If VERITY_IMAGE_FECDEV_SUFFIX is set, a separate file
with the given suffix will be used.

When enabled, the parameter file gains additional variables necessary
for correct DM table generation.

Recipes that do not set VERITY_FEC = "1" behave the same as before.

Signed-off-by: Andreas Zdziarstek <andreas.zdziarstek@gmail.com>
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>

0 files changed, 0 insertions, 0 deletions