tree 55cc77d9c87a50b633ee11fb8ee3a06b6aad2587
parent 6741adba6ffe06573e74647ac719f2a5f0798ab0
author Archana Kakani <archana.kakani@ibm.com> 1724159478 -0500
committer Kuiying Wang <wangkuiying.wky@alibaba-inc.com> 1731566817 +0000

Add version to BaseBiosTable to prevent data loss

The initial version of the Base BIOS table did not support Value Display
Names (VDN). Support for VDN was introduced in a commit [1]. A BMC image
created without VDN support stores data in the old BaseBiosTable format.
If a new BMC image (with VDN support) is flashed over an older image
(without VDN support), the BIOS manager attempts to read the binary
archive generated by the older BIOS settings manager. Since it doesn't
recognize the newly added property, it assumes the persisted file is
corrupted and ignores all the saved settings.

To prevent the loss of persisted BIOS data, the versioning support
provided by the Cereal library is used. This version information is
utilized to convert the persisted data into the current supported
format.

[1]: https://github.com/openbmc/bios-settings-mgr/commit/1a448ad88fdaec7e082b4a1c437f7f3c990402cd

Change-Id: If68be37e32ae31d7338d8933df945453a30c113a
Signed-off-by: Archana Kakani <archana.kakani@ibm.com>