On Thu, Apr 24, 2003 at 01:12:11PM -0700, Pete Popov wrote: > > > Here's another question: > > > What are the goals of the AU1500 PCI auto config? Is it supposed to be a full > > implementation, or just enough to work with a PCI card? The reason I ask is > > that the DBAu1500 has only one PCI slot, so a simple implementation would > > normally suffice. > > > > Restated: I don't know if the PCI auto config code was designed to work with > > all sorts of wacky PCI devices. I don't know if the intention of the code is to > > support the single PCI slot present on the DbAu1500 development board, or if it > > is supposed to be more flexible (and complicated). > > The MIPS pci auto should work fine with a single PCI bus and it _should_ > be a full implementation. The code was ported from PPC some time ago, > but sub busses were not tested. That is not true. pciauto has been working P2P bridges pretty much since day one. Usually sub-bus not working is due to type 1 configuration not supported in pci ops, which is board-dependent code. I took a brief look of au1x00 pci_ops and it appears it does not support type 1 configuration access. See arch/mips/ddb5xxx/ddb5477/pci_ops.c for one example on how type 1 configuration being supported. Jun
