For older FVPs (without support for RME extension) the top 16MB of DRAM1 is reserved as Trusted DRAM. However, the latest FVP Base RevC AEM Model [1] has support for RME extension. When RME extension is present the top 64MB of DRAM1 (i.e. at the top of the 32bit address space) is carved out for four-world support in TF-A [2].
Therefore, reduce the System Memory size by 64MB. Reference: [1] FVP Base RevC AEM Model (available on x86_64 / Arm64 Linux) (https://developer.arm.com/Tools%20and%20Software/ Fixed%20Virtual%20Platforms) [2] commit c872072 (https://review.trustedfirmware.org/plugins/gitiles/ TF-A/trusted-firmware-a/+/c8720729726faffc39ec64f3a02440a48c8c305a)) Signed-off-by: Sami Mujawar <sami.muja...@arm.com> --- Platform/ARM/VExpressPkg/ArmVExpress-FVP-AArch64.dsc | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/Platform/ARM/VExpressPkg/ArmVExpress-FVP-AArch64.dsc b/Platform/ARM/VExpressPkg/ArmVExpress-FVP-AArch64.dsc index dc081794cf98a27c667ef85bd27dacd80e9e8bd2..f70a4d52ba06f570e017ab5286f06d87193753e5 100644 --- a/Platform/ARM/VExpressPkg/ArmVExpress-FVP-AArch64.dsc +++ b/Platform/ARM/VExpressPkg/ArmVExpress-FVP-AArch64.dsc @@ -107,9 +107,12 @@ [PcdsFixedAtBuild.common] gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize|0x4000 gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize|0x0 - # System Memory (2GB - 16MB of Trusted DRAM at the top of the 32bit address space) + # System Memory + # When RME is supported by the FVP the top 64MB of DRAM1 (i.e. at the top + # of the 32bit address space) is reserved for four-world support in TF-A. + # Therefore, set the default System Memory size to (2GB - 64MB). gArmTokenSpaceGuid.PcdSystemMemoryBase|0x80000000 - gArmTokenSpaceGuid.PcdSystemMemorySize|0x7F000000 + gArmTokenSpaceGuid.PcdSystemMemorySize|0x7C000000 # Size of the region used by UEFI in permanent memory (Reserved 64MB) gArmPlatformTokenSpaceGuid.PcdSystemMemoryUefiRegionSize|0x04000000 -- 'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)' -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#103096): https://edk2.groups.io/g/devel/message/103096 Mute This Topic: https://groups.io/mt/98319017/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
