env: Add single to redundant environment upgrade path

Add support for converting single-copy environment to redundant environment.
In case CRC checks on both redundant environment copies fail, try one more
CRC check on the primary environment copy and treat it as single environment.
If that check does pass, rewrite the single-copy environment into redundant
environment format, indicate the environment is valid, and import that as
usual primary copy of redundant environment. Follow up 'env save' will then
store two environment copies and the system will continue to operate as
regular redundant environment system.

Add test which validates this upgrade path. The test starts with spi.bin
which is pre-populated as single-copy environment and then upgrades that
environment to dual-copy environment.

Signed-off-by: Marek Vasut <[email protected]>

0 files changed, 0 insertions, 0 deletions