Hi Dan, I have written the config read/write functions similar to the ones in qspan_pci.c for plx.
> Depending upon what you mean by "map", most PCI bridges rely on > well known physical (bus) address or/and chip selects to function > properly, just like other devices attached to the processor. You are correct in that the PLX has a chip select which results in the its configuration registers being available. "Map" was clearly the wrong word to use. :-) The PLX requires a chip select for its internal registers, but does not require one for the PCI image . The PLX9054 decodes all address lines on the local bus and generates its own chip select. The PLX uses address of the memory region used for "I/O" mapped devices for PCI configuration cycles. Thanks for the help. -Ajay -----Original Message----- From: Dan Malek [mailto:[EMAIL PROTECTED] Sent: Thursday, November 16, 2000 5:23 AM To: Kunnath, Ajay Cc: linuxppc-embedded at lists.linuxppc.org Subject: Re: Local-PCI bridge mapping ajay.kunnath at exgate.tek.com wrote: > I have a proprietary MPC860 board which has a PLX 9054 Local-PCI > bridge. I am running the 2.4.0 version of the kernel from > montavista. The PLX isn't supported as a PCI bridge in the 8xx kernel...... The 2.4.0 version of the kernel isn't supported in the CDK for the 8xx either....If anything works you are just lucky. > My problem is that I am not able to map the configuration registers > to any other address but 0x80000000. What do you mean "map"? You use ioremap()? When? > .... When I map it to 0x80000000, it > works great, any other address and it just crashes. Depending upon what you mean by "map", most PCI bridges rely on well known physical (bus) address or/and chip selects to function properly, just like other devices attached to the processor. Tell us how the PLX decodes the configuration space access as a target, how your system has attached the PLX to the processor, and we can probably help. You are going to have to minimally write a set of functions like those found in qspan_pci.c to accomodate the PLX. -- Dan ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
