On Thursday 28 September 2006 10:36, Jesse Barnes wrote: > On Wednesday, September 27, 2006 9:55 pm, eiichiro.oiwa.nm@xxxxxxxxxxx > wrote: > > pci_fixup_video turns into generic code because there are many platforms > > need this fixup for embedded VGA as well as x86. The Video BIOS > > integrates into System BIOS on a machine has embedded VGA although > > embedded VGA generally don't have PCI ROM. As a result, embedded VGA > > need the way that the sysfs rom points to the Video BIOS of System RAM > > (0xC0000). PCI-to-PCI Bridge Architecture specification describes the > > condition whether or not PCI ROM forwards VGA compatible memory address. > > fixup_video suits this specification. Although the Video ROM generally > > implements in x86 code regardless of platform, some application such as > > X Window System can run this code by dosemu86. Therefore, > > pci_fixup_video should turn into generic code. > ... > Thanks a lot, Eiichiro, this patch has been needed for awhile. Are there really ia64 machines where we need to use the option ROM copy at 0xC0000? If so, is this documented somewhere? I couldn't find any mention in DIG64, EFI, or internal HP architecture specs. If we do need to use it, ia64 has a bit of a problem because on some boxes, the 0xC0000 memory supports only cacheable access, the VGA frame buffer at 0xA0000 supports only uncacheable access, and the usual ia64 ioremap mapping is a 16MB page that covers both. Bjorn - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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