Local-PCI bridge mapping

Dan Malek dan at mvista.com
Thu Nov 16 10:52:39 EST 2000

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

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