The patch at "6c8a08bd8a680 ArmVirtPkg/PrePi: Ensure timely execution of library constructors" moved the processing of library constructors before the MMU is initialised.
This resulted in the BaseDebugLibSerialPort library constructor BaseDebugLibSerialPortConstructor () which initialises the serial port, being invoked before the MMU is enabled. However, the Realm Code requires the protection attribute of the MMIO regions to be configured as unprotected (shared with the host), which requires the MMU to be enabled. Otherwise, accesses to the MMIO region result in a synchronous external abort being reflected to the Realm by the RMM. Therefore, link the Null version of DebugLib in PrePi stage. Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org> Cc: Leif Lindholm <quic_llind...@quicinc.com> Cc: Gerd Hoffmann <kra...@redhat.com> Signed-off-by: Sami Mujawar <sami.muja...@arm.com> --- ArmVirtPkg/ArmVirtKvmTool.dsc | 1 + 1 file changed, 1 insertion(+) diff --git a/ArmVirtPkg/ArmVirtKvmTool.dsc b/ArmVirtPkg/ArmVirtKvmTool.dsc index 20da3319667900e64755272fa110d57452d1fc67..d09b3e06928ad70dba8581bd605a7c76b231ba61 100644 --- a/ArmVirtPkg/ArmVirtKvmTool.dsc +++ b/ArmVirtPkg/ArmVirtKvmTool.dsc @@ -250,6 +250,7 @@ [Components.common] # ArmVirtPkg/PrePi/ArmVirtPrePiUniCoreRelocatable.inf { <LibraryClasses> + DebugLib|MdePkg/Library/BaseDebugLibNull/BaseDebugLibNull.inf ExtractGuidedSectionLib|EmbeddedPkg/Library/PrePiExtractGuidedSectionLib/PrePiExtractGuidedSectionLib.inf LzmaDecompressLib|MdeModulePkg/Library/LzmaCustomDecompressLib/LzmaCustomDecompressLib.inf PrePiLib|EmbeddedPkg/Library/PrePiLib/PrePiLib.inf -- 'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)' -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#117690): https://edk2.groups.io/g/devel/message/117690 Mute This Topic: https://groups.io/mt/105483429/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-