[pci] Configuration Space Hanging

[Dave Kroetsch <dkroetsch@videolocus.com>]

We're running into a problem with the PCI configuration 
space "hanging".  We are attempting to do simultaneous Target and 
Initiator transfers when this occurs.  The wishbone and pci buses are 
running synchronously.

The setup has a DMA coming IN the PCI_T and out of the wishbone
master to a memory, and a DMA (using the OpenCore DMA Engine) out 
through the wishbone slave to the PCI_I.  

This setup works for a few transactions, but then the wb_slave returns 
an ERR, and stops the dma "out" of through the PCI_I.  At this point the 
PCI configuration space seems hung and returns all 0xffffffff.  However,
wishbone transactions still work.  We still have access to devices on the 
wishbone bus (hanging off wb_master), and can even continue to 
operate outbound DMA transfers (wb_slave), but we cannot do this 
simultaneously.

Has this type of functionality been tested?  Does anyone have any 
thoughts on how to fix this?

Thanks,
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