Re: Moving from 2.6.14 (ppc) to 2.6.20 (powerpc): problems with PCI-PCI bridge

Johan Borkhuis wrote:

Hello,

I was using kernel version 2.6.14 (ppc) on a  MVME3100 board (MPC8540 
processor). We are planning to move to 2.6.20 (powerpc), but I have some 
problems with the initialization of a PCI-PCI bridge.
Connected to the MVME3100 board is a PCI-PCI bridge (HiNT, PCI6150, 
3388:0022). When using the 2.6.14 kernel this bridge is initialized 
correctly:  it is setup as bus-master, memory and IO are configured, and 
the memory allocation on the PCI-bus is correct.
When I use 2.6.20 (powerpc) the device is not configured correctly: 
bus-master, memory and IO are not set, and the memory space of the 
bridge on the PCI bus is set to the minimum value (0xfffff).
I can correct these settings by modifying the PCI_COMMAND register to 
set the bus-master, memory and IO. I change the size of the memory space 
in pci_32.c, by forcing the size to the required setting in 
pci_relocate_bridge_resource. But to be honest, I don't like this very 
much: modifying registers like this should not be needed, so I guess 
there is something wrong in my configuration or setup.

How can I fix this problem in a better way? What could be wrong with my 
configuration?

There has been a fair amount of PCI setup reworking done
somewhat recently.  (.22 and .23, IIRC, and even .24).
It might be best if you can try 2.6.24.

jdl