MPC8548 PCIe / PCI support with BSP MPC8548CDS 02/24/2006

[Zhang Wei-r63237]

> We did the hardware fix described in the BSP user's manual to 
> make PCIe work (according to the manual section 2.1, step 3).
> I.e.
>   1) removed R193 and R194 on the carrier card (rev 1.2)
>   2) removed RN1 on the CPU daughter card
>   2a) connected pad3 of RN1 to pin3 of U12 (IRQ0)
>   2b) connected pad2 of RN1 to pin4 of U12 (IRQ1)
> 
> Does this fix the interrupt polarity problem (as well)?

Yes, I think so. You can plug a PCIe ethernet card to test it. 

> 
> We applied the provided kernel patch as well.
> IMHO that patch just moves the local PCIe root-complex 
> "out-of-space" so no detection of that one occurs any more.
> This is what actually happens when "lspci" is run.
> 
> However we still don't see any devices behind the PCIe switch 
> (e.g. a transparent PLX8516). It seems that the enumeration 
> process (traversing through the bus hierarchy) in the kernel 
> is somehow disabled.

:-), Maybe it's need more study. Could you enable the DEBUG and post the kernel verbose message?

> Bottom line: Only one device accessible at all on the PCIe port.
> 
> Any further ideas?
> 
> Thanks,
> 
>    Florian
> 
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