Hi,

I'm getting Alignment Fault when running UEFI image on Juno R0 board which is caused by VariableRuntimeDxe driver's Reclaim() function calling

//
// Copy variable store header.
//
CopyMem (ValidBuffer, VariableStoreHeader, sizeof (VARIABLE_STORE_HEADER));

in edk2\MdeModulePkg\Universal\Variable\RuntimeDxe\Variable.c.

The code above copies 28 bytes of data from NOR flash memory region @0xBFC0048 using __memcpy() from

edk2\MdePkg\Library\BaseMemoryLibOptDxe\AArch64\CopyMem.S using unaligned memory accesses, causing Alignment fault for flash region which is mapped as device memory.

The fix involves switching to generic baseMemoryLib and for ArmJuno.dsc is listed below:

MdeModulePkg/Universal/Variable/RuntimeDxe/VariableRuntimeDxe.inf {
    <LibraryClasses>
      NULL|MdeModulePkg/Library/VarCheckUefiLib/VarCheckUefiLib.inf
+     BaseMemoryLib|MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf
}

and is similar to the following commits for Hisilicon/D02/D03/D05:

Hisilicon/D02: flash related drivers switch to use generic BaseMemoryLib:

https://git.linaro.org/uefi/OpenPlatformPkg.git/commit/Platforms/Hisilicon/D02/Pv660D02.dsc?id=e3c520596d9ebdc525f284a9da95f080af815ec9

Hisilicon/D03: flash related drivers switch to use generic BaseMemoryLib:

https://git.linaro.org/uefi/OpenPlatformPkg.git/commit/Platforms/Hisilicon/D03/D03.dsc?id=337713801cceb684326bfde22975310ca1bd0cc0

Hisilicon/D05: flash related drivers switch to use generic BaseMemoryLib:

https://git.linaro.org/uefi/OpenPlatformPkg.git/commit/Platforms/Hisilicon/D05/D05.dsc?id=0749464022407f11c0c6a46cb8eb293fc74ef236

Alexei.