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The VariableRuntimeDxe driver may use CopyMem () on NOR flash regions, assuming such regions always have full memory semantics. Given that those regions cannot be mapped as ordinary memory on ARM (due to the fact that the NOR flash requires device semantics while in write mode) this prevents us from using BaseMemoryLibOptDxe in VariableRuntimeDxe, since it may use unaligned accesses and/or DC ZVA instructions, both of which are incompatible with mappings using device semantics. Note that there is no way we can work around this by changing the mapping type between 'memory' and 'device' when switching from read to write mode and back, because the runtime mapping is created by the OS, and cannot be changed at will. So let's just switch to the unaccelerated version of BaseMemoryLib which does not have the same problem. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Tested-by: Shannon Zhao <zhaoshenglong@huawei.com>
EDK II Project
A modern, feature-rich, cross-platform firmware development environment for the UEFI and PI specifications from www.uefi.org.
Contributions to the EDK II open source project are covered by the TianoCore Contribution Agreement 1.1
The majority of the content in the EDK II open source project uses a BSD 2-Clause License. The EDK II open source project contains the following components that are covered by additional licenses:
- AppPkg/Applications/Python/Python-2.7.2/Tools/pybench
- AppPkg/Applications/Python/Python-2.7.2
- AppPkg/Applications/Python/Python-2.7.10
- BaseTools/Source/C/BrotliCompress
- MdeModulePkg/Library/BrotliCustomDecompressLib
- OvmfPkg
- CryptoPkg/Library/OpensslLib/openssl
The EDK II Project is composed of packages. The maintainers for each package are listed in Maintainers.txt.