mirror of https://github.com/acidanthera/audk.git
76fd5a660d
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:
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||
|---|---|---|
| .. | ||
| Application | ||
| Bus | ||
| Core | ||
| Include | ||
| Library | ||
| Logo | ||
| Universal | ||
| MdeModulePkg.dec | ||
| MdeModulePkg.dsc | ||
| MdeModulePkg.uni | ||
| MdeModulePkgExtra.uni | ||