Good point with the DxeCore, I didn't consider that. Though OsBoot would be
irrelevant to the PEI phase, wouldn't it be?
From: Yao, Jiewen [mailto:jiewen....@intel.com]
Sent: Friday, February 2, 2018 1:40 PM
To: Marvin H?user <marvin.haeu...@outlook.com>; email@example.com
Subject: RE: MinPlatformPkg/PlatformInit: FV code
From: Marvin H?user [mailto:marvin.haeu...@outlook.com]
Sent: Wednesday, January 31, 2018 1:54 AM
To: firstname.lastname@example.org<mailto:email@example.com>; Yao, Jiewen
Subject: MinPlatformPkg/PlatformInit: FV code
Dear developers, dear Jiewen,
I have been investigating the devel-MinPlatform branch of edk2-platforms for
educational purposes and got two questions regarding the Firmware Volume code
in PlatformInitPreMem, if you do not mind. I assume the tree was tested, so
most likely I misunderstood some things.
1. Why is a Firmware Volume HOB built to cover the entire flash range
Am I correct that this implies a FV spanning through the entire flash MMIO
range, which would then imply all other FVs are contained within it? This would
make sense, however that's not what I saw in the KabylakeOpenBoardPkg Flash
Map, which has the NV Storage first
[Jiewen] You are right. We should not use FD region for FV. Will fix it.
1. Why are FV Info PPIs installed for the UefiBoot and the OsBoot FVs
If I checked correctly, installing this PPI type will trigger PeiCore to
dispatch PEIMs in the FVs, however there are only DXE drivers in these. Why are
no FV HOBs installed, which are gotten by DxeCore?
[Jiewen] In DxeIpl, PeiServicesFfsFindNextVolume() is used to search DxeCore.
In PeiCore, PeiFfsFindNextVolume() calls FindNextCoreFvHandle() for DxeCore one
by one. If PcdFrameworkCompatibilitySupport is FALSE, it returns
And Fv[Instance] is added in FirmwareVolmeInfoPpiNotifyCallback(), when
gEfiPeiFirmwareVolumeInfo2PpiGuid is installed.
So if PcdFrameworkCompatibilitySupport is FALSE, install PPI is the only way to
let PEI core discover DxeCore.
Only if PcdFrameworkCompatibilitySupport is TRUE, install PPI is not required,
but the FindNextCoreFvHandle() will install the PPI for the HobFv. The result
Thanks in advance for your time!
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