On Thu, 9 Aug 2007, Andi Kleen wrote:
> Some broken devices have been discovered to require %al/%ax/%eax registers
> for MMIO config space accesses. Modify mmconfig.c to use these registers
> explicitly (rather than modify the global readb/writeb/etc inlines).
> AK: also changed i386 to always use eax
> AK: moved change to extended space probing to different patch
> AK: reworked with inlines according to Linus' requirements.
> AK: improve comments.
> Signed-off-by: dean gaudet <[email protected]>
> Signed-off-by: Andi Kleen <[email protected]>
Damn you, Andi.
You had obviously never actually tested this on x86.
> --- linux.orig/arch/i386/pci/mmconfig.c
> +++ linux/arch/i386/pci/mmconfig.c
> - writeb(value, mmcfg_virt_addr + reg);
> + mmio_config_writeb(mmcfg_virt_addr, value);
Notice something missing here? The new code cannot work on any machine
that actually uses mmio cfg.
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