multiple separate pci bridges ...
sven.luther at wanadoo.fr
Tue Jan 6 18:14:12 EST 2004
On Mon, Jan 05, 2004 at 04:38:50PM -0500, Marcus Barrow wrote:
> Hi Sven:
> I think there is some basic brokeness in the Discovery
> specific code. I've been meaning to go and look at some
> of the original code, to see if some stuff was left on
> the floor.
Mmm. What code are you speaking about here ?
> On our evalution boards the P2P registers are not set
> up. So you indeed have two PCI bus 0. The P2P register
> for PCI bus 1 should be initialized to identify it as
> bus 1, or whatever the right value is considering
> any more bridges found on bus 0.
Mmm, i understand that the 2.6.x pci domain will make this not
necessary. I might be wrong though.
> If you insert pci cards which contain bridges on them,
> they only work on the bus 0 slots...
bus 1 is used as an agp bus anyway, and i doubt there are many agp
graphic cards out there with pci bridges on them. When i inserted my
Appian Jeronimo 2000 in that board, it refused to powerup at all, but
then, maybe it is drawing too much power or something. After all, it has
a 3dlabs gamma and two permedia3 on it.
> Do you have something like ppcboot or uboot starting
> your system or just a kernel? If you are using a real
Well, there is a customized SmartFirmware OpenFirmware on the board. I
even have (non-free though) access to the source of it. The board is
mostly a CHRP design.
> boot rom, you could try initializing the p2p registers
> by hand, then booting...
The Firmware guy told me don't touch it though.
> I'm hoping to work on this in the next few days.
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