On Fri, Nov 30, 2007 at 08:57:33AM -0600, Kumar Gala wrote:

On Nov 30, 2007, at 3:37 AM, Li Li wrote:

quoted

If do it standard, a 256M config space, at least 256M mem space and  
16M
io space are needed for each PCIE controller.
To allocate PCIE window, the window size only can be 512M or 1G.
If we choose 1G space, two PCIE controller needs 2G space.
We do not have 2G free physical space now. Usually, we use upper 128M
configure space. So, we have to cut down the config space.

That decision should be made in the kernel, not the dts.

Is it possible to make the outbound window for cfg space 4k and change  
the region of config space its looking at?

Yes, that'd be best.

quoted

Here is a little complex. The MPC837xE board needs a carrier board to
extend PCIE slot. If user does not populate carrier board onto MPC837xE
board and do PCIE scan, the system will halt. I just want to provide a
easy way to disable the PCIe other than modify and recompile the dts.

So I have to recompile the kernel for this case, that seems even more  
painful to the user.  Can we not detect if this board isn't there and  
not hang?

Assuming it's similar to PCI on other 83xxMDS, yes -- there's a bit in the
reset control words that can be checked.

We don't currently do it on any 83xx that I'm aware of, though. :-P

-Scott