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Clearing I/O port decoding in the PCI command register at ExitBootServices() breaks IDE boot in Windows, on QEMU's "pc" (i440fx) machine type. (AHCI boot on "q35" is unaffected.) Windows seems repeatedly stuck, apparently waiting for a timeout of sorts. This is arguably a Windows bug; a native OS driver should not expect the firmware to leave the PCI command register in any particular state. Strictly speaking, we only need to disable BM-DMA at ExitBootServices(), in order to abort pending transfers to/from RAM, which is soon to be owned by the OS. BM-DMA is also the only bit that's explicitly named by the UEFI Driver Writers' Guide, for clearing at ExitBootServices(). I've verified that clearing only BM-DMA fixes the issue (boot time) on i440fx, and does not regress q35/AHCI. Cc: Aleksei Kovura <alex3kov@zoho.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Dann Frazier <dannf@ubuntu.com> Cc: Eric Dong <eric.dong@intel.com> Cc: Star Zeng <star.zeng@intel.com> Reported-by: Aleksei Kovura <alex3kov@zoho.com> Reported-by: Dann Frazier <dannf@ubuntu.com> Reported-by: https://launchpad.net/~cjkrupp Bisected-by: Dann Frazier <dannf@ubuntu.com> Bisected-by: https://launchpad.net/~cjkrupp Suggested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Suggested-by: Star Zeng <star.zeng@intel.com> Ref: https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/1725560 Fixes: 6fb8ddd36bde45614b0a069528cdc97077835a74 Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Tested-by: dann frazier <dann.frazier@canonical.com> Reviewed-by: Star Zeng <star.zeng@intel.com> Tested-by: Aleksei Kovura <alex3kov@zoho.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.