Mostly, this is only necessary for devices that the CSM might have native support for, such as VirtIO and NVMe; PciBusDxe will already degrade devices to 32-bit if they have an OpROM.
However, there doesn't seem to be a generic way of requesting PciBusDxe to downgrade specific devices. There's IncompatiblePciDeviceSupportProtocol but that doesn't provide the PCI class information or a handle to the device itself, so there's no simple way to just match on all NVMe devices, for example. Just leave gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Size set to zero for CSM builds, until/unless that can be fixed. Signed-off-by: David Woodhouse <dw...@infradead.org> --- OvmfPkg/OvmfPkgIa32X64.dsc | 4 ++++ OvmfPkg/OvmfPkgX64.dsc | 4 ++++ 2 files changed, 8 insertions(+) diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc index 639e33cb28..ad20531ceb 100644 --- a/OvmfPkg/OvmfPkgIa32X64.dsc +++ b/OvmfPkg/OvmfPkgIa32X64.dsc @@ -543,7 +543,11 @@ gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio32Base|0x0 gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio32Size|0x0 gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Base|0x0 +!ifdef $(CSM_ENABLE) + gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Size|0x0 +!else gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Size|0x800000000 +!endif gEfiMdePkgTokenSpaceGuid.PcdPlatformBootTimeOut|0 diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc index 69a3497c2c..0542ac2235 100644 --- a/OvmfPkg/OvmfPkgX64.dsc +++ b/OvmfPkg/OvmfPkgX64.dsc @@ -542,7 +542,11 @@ gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio32Base|0x0 gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio32Size|0x0 gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Base|0x0 +!ifdef $(CSM_ENABLE) + gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Size|0x0 +!else gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Size|0x800000000 +!endif gEfiMdePkgTokenSpaceGuid.PcdPlatformBootTimeOut|0 -- 2.21.0 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#42814): https://edk2.groups.io/g/devel/message/42814 Mute This Topic: https://groups.io/mt/32202510/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
