Messages in this thread | | | Date | Tue, 28 Jan 2003 10:32:53 +0100 (MET) | From | Geert Uytterhoeven <> | Subject | Re: [patch 2.5] VGA IO on systems with multiple PCI IO domains |
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On Tue, 28 Jan 2003, Ivan Kokshaysky wrote: > On Mon, Jan 27, 2003 at 06:55:04PM +0100, Benjamin Herrenschmidt wrote: > > Well, your example clearly limits us to one IO space for VGA, which > > might not be what we want. The problem also exist for some fbdev drivers > > which might need to tap the VGA IOs of a given PCI card (thus getting > > access to the "legacy" IOs of the bus the card is on). > > You are right, I've already realized that. :-) > The struct pci_bus * arg to legacy_ioport_remap (maybe better > pci_legacy_ioport_remap) is really good idea, and it's perfectly > ok to pass NULL in the vgacon case - we are limited to only one > VGA console anyway. > After the PCI setup is done, pci_legacy_ioport_remap(pbus, &legacy_resource) > would solve any problem I can think of, including multiple ISA bridges.
BTW, we still need a separate isa_request_mem_region(), since right now we cannot simply call request_mem_region(0xa0000, 0x10000) to request the VGA memory buffer in ISA memory space. On ia32 the plain request_mem_region() is OK, but on other archs you need to add the ISA memory space base.
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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