Andrew: Current implementation requires PEI PcdDB and DXE PcdDB match. This is like a new request for PCD DataBase. It requests PCD DB binary format and Dynamic PCD token assignment be compatible in the different version.
Thanks Liming > -----Original Message----- > From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Andrew Fish > via Groups.Io > Sent: Tuesday, February 11, 2020 1:39 AM > To: devel@edk2.groups.io > Subject: [edk2-devel] PCD Migration issue > > We recently hit an issue when updating our UDK version in our common code > base. Our recovery update path started failing for older > platforms since the PEI was the old UDK version and the DXE from the Capsule > was the new UDK version. Basically the version of the PCD > changed. It looks like there are some checks, but the seem to be more about > making sure the build systems matches the code vs. dealing > with an update case like we hit. > > It does not look like the PCD database is designed to deal with this. We are > fixing this by extracting the PEI PCD database from the > capsule and then having some platform specific code to patch any PCD entries > that got set in PEI that are needed by DXE. > > In the future it would be helpful if the PCD database would change in some > what of a backward compatible way, and have the headers > needed to parse the old and new version. > > It also seems like adding a Dynamic PCD could potentially change the token > layout and thus break compatibility? Is there any scheme to > keep a previous token layout? > > Thanks, > > Andrew Fish > -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#54254): https://edk2.groups.io/g/devel/message/54254 Mute This Topic: https://groups.io/mt/71143835/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
