On Monday, November 14, 2016 11:11:11 AM CET One Thousand Gnomes wrote: > > > It's not a safe assumption for x86 at least. There are a few systems with > > > multiple ISA busses particularly older laptops with a docking station. > > > > But do they have multiple ISA domains? There is no real harm in supporting > > it, the (small) downsides I can think of are: > > I don't believe they x86 class ones have multiple ISA domains. But as > I've said I don't know how the electronics in the older ThinkPad worked > when it used two PIIX4s with some LPC or ISA stuff on each. > > It works in DOS and unmodified Linux so I'm pretty sure there are no > additional domains. Likewise the various x86 schemes that route some bits > of ISA bus off into strange places work in DOS and don't have any > overlaps. > > yenta_socket handles PCI/PCMCIA bridging and routes a range of that flat > ISA space appropriately to the card. Right, that's what I had expected, so we still don't even need to handle multiple ISA I/O address spaces for the only known case of multiple ISA buses, though we may decide to generalize the code like that anyway. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
