On Thu, 2003-04-24 at 18:48, Jun Sun wrote: > 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. There is support for type 1 accesses in arch/mips/au1000/common/pci_ops.c. Maybe you were looking at the pb1000 pci routine which had limited pci bus support in an fpga. The Au1500 pci routine does support type 1 accesses. Pete
