[U-Boot] PCIe and Dell parity interrupt

Hi

We have a PCIe board with a PPC P2020 cpu. We're trying to set it up using U-Boot. Without initializing the PCIe part the PC won't even boot. Now we seem to have the initialization part running but we sometimes get an error on the PC:

I/O Card Parity Interrupt

Some googleing suggests that this is a problem with Dell computers only. In fact our test computer is a Dell as well, in another PC the same card and software came up without a problem.

Is there something we did wrong or can do to prevent this error? I'm sure that some of our customers have some Dell's as well, so we'd like to get rid of this error.

Thanks

bye Fabi