On Thu, Jan 18, 2001 at 10:53:16PM +0200, Matti Aarnio wrote:
> On Thu, Jan 18, 2001 at 09:59:06AM -0800, [EMAIL PROTECTED] wrote:
> ...
> > > Yes. PCI-based drivers will most likely use bus order since the kernel
> > > provides facilities to do this easily. For a single driver driving
> > > multiple cards on multiple bus types, who knows.
> >
> > Multiple bus types... Compaq server with PCI and EISA, for example? IIRC
> > the EISA bus is bridged onto one of the PCI busses. Perhaps a
> > breadth-first scan; PCI busses first, then bridged devices on PCI, then
> > internal non-PCI busses, then external busses.
> >
> > Are there any systems where a non-PCI bus is not connected through a
> > PCI-foo bridge?
>
> Yes.
>
> Oh, you propably won't meet them in PC world, but pick
> any UltraSPARC; PCI and SBUS are on parallel "hoses".
> ("hose" is term used at Alpha code for the IO-bus to
> CPU/MEMORY bus interface, sort of "north bridge".)
> Actually those UltraSPARC systems have core-bus called UPA,
> and IO-busses, like PCI and SBUS, are connected there...
>
> Also these "big" systems often do come with multiple "hoses"
> of same type.
>
> If you look carefully at intel things, there is this "FSB"
> which is the real core-bus, and IO-busses hang on it.
>
>
> I have never myself seen big Digital Alpha system where IO-
> busses are anything but PCI, but there exists options to place
> there FutureBus+, PCI, VME, TurboChannel, and several other
> DEC proprietary things. With 43-45 bits of physical address
> space out of the processors, it is trivial to plug in multiple
> 32-bit address space busses.
>
> In coherent view NUMA implementation of Linux, there possibly
> comes even the detail about which NUMA node the busses reside at.
I'm pretty sure the IBM PC-Server 700 (8 MCA-slots and 8 PCI-slots
and a lot of other cool stuff) doesn't have the MCA-bus bridged
onto the PCI-bus. Maybe the other way around. I'd be happy to get one
of these machines to test this, but they seem to be a little hard
to get by for free... :^)
/David
_ _
// David Weinehall <[EMAIL PROTECTED]> /> Northern lights wander \\
// Project MCA Linux hacker // Dance across the winter sky //
\> http://www.acc.umu.se/~tao/ </ Full colour fire </
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