[coreboot] K8 HT architecture

yhlu yinghailu at gmail.com
Sat Oct 25 22:00:10 CEST 2008

On Sat, Oct 25, 2008 at 9:25 AM, Tom Sylla <tsylla at gmail.com> wrote:

> Hopefully it is clear now how things can move like that. The Opterons
> won't move. It is possible with HT that other devices may exist on
> higher bus numbers without a bridge (real or fake) from bus 0. It is
> weird, and non-legacy compatible, so it should not happen with NB and
> SB devices. There are exceptions, though, when we connect our nc
> FPGAs, and put them at bus 20, we have no bridge in config space
> connecting them to bus 0. By default, the linux kernel will not find
> them (it does a normal PCI scan, looking for bridges, subordinates,
> etc). We must advertise the non-contiguous PCI busses in an ACPI table
> for Linux and Windows to "see" the higher busses that are not bridged
> to bus 0. (there are some other ways to force the linux kernel to find
> the devices, but the ACPI method works for all the current OSes we've
> tried). The point is that making the PCI busses discontiguous is
> "weird", and makes you jump through other hoops to play well with
> OSes.

linux kernel will do some legacy check from irq_routes_tables..... when acpi
is disabled...

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