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Date: Thu, 19 Oct 2006 16:54:19 +0900 From: <eiichiro.oiwa.nm@...achi.com> To: "David Miller" <davem@...emloft.net> Cc: <alan@...hat.com>, <jesse.barnes@...el.com>, <greg@...ah.com>, <linux-kernel@...r.kernel.org> Subject: Re:pci_fixup_video change blows up on sparc64 > >This change in 2.6.19-GIT: > >commit b5e4efe7e061ff52ac97b9fa45acca529d8daeea >Author: eiichiro.oiwa.nm@...achi.com <eiichiro.oiwa.nm@...achi.com> >Date: Thu Sep 28 13:55:47 2006 +0900 > > PCI: Turn pci_fixup_video into generic for embedded VGA > >breaks sparc64 with ATI Radeon and ATY128 cards. > >The problem is that there is no system rom at 0xc0000 on sparc64, and >therefore nothing copies the VGA bios of the graphics card there on >bootup. Therefore all of this code is bogus and will just result in >bus errors when the Radeon or ATY128 driver tries to pci_map_rom() and >read the graphics card ROM. Nothing will respond to accesses at the >0xc0000 region on sparc64. > >The existence of a primary video ROM at 0xc0000 is quite platform >specific. If some non-x86 systems have this too, that's great. >However, assuming all systems do is not correct. > Does ATI Radeon card have an expansion ROM (video ROM)? Could you show me "lspci -vv" on sparc64? If an expansion ROM exists on ATI Radeon or ATY128 card, pci_map_rom returns the expansion ROM base address instead of 0xC0000 because fixup_video checks the VGA Enable bit in the Bridge Control register. The Bridge Control register describes in "PCI-to-PCI Bridge Architecture Specification Revision 1.2". This specification is the standard specification in PCI. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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