On Thu, 2007-08-09 at 17:56 +0200, Segher Boessenkool wrote: > > It means the bus on which legacy I/O ports can be found. It's a fairly > > broken concept; each host bridge should really be treated as a > > completely separate entity, and if something like a VGA card has legacy > > I/O ports that need to be used, they should be looked for on the same > > PCI bus as the card itself. Legacy ISA ports should be discovered > > through the device tree (or platform devices, or whatever) that > > explicitly state which PCI-to-ISA bridge they're under. > > Currently, Linux does not allow multiple PCI domains to use > overlapping legacy I/O ranges. Yeah it's a pain.
I have a plan I exposed a little while ago to handle that. We need that for VGA cards among others anyway. The idea is basically a call around the lines of pci_convert_legacy_resource(struct resource *r); You fill up the resource with flags = MEM/IO and start/end being your legacy range, and it returns a "fixed" resource that you can use with inX/outX, or whatever else. Haven't had time to code something up, and we need to provide a default impl. for all archs too ... but feel free to volunteer and beat me to it :-) Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
