Re: Add support for DEC/Intel 21150 PCI-PCI bridge

["Joel Sherrill <joel at OARcorp dot com>" <joel dot sherrill at OARcorp dot com>]

Peter Dufault wrote:
> I want to add support for the DEC/Intel 21150 PCI-PCI bridge, initially 
> for the MVME5500 so I can use a Motorola PMCSPAN to get more PMC slots.
>
> I see the code in mvme5500/pci/pci.c where it detects bridges, and I did 
> the trivial change to have it find the DEC 21150, but I don't see where 
> bridges are setup.  I looked at the 21150 documentation, and it seems as 
> if it won't be too much work to get it set up and after that things 
> should "just work".
>
> I don't know much about this yet, and any pointers on what to change and 
> how things are going to go in the future (for more generic PCI support 
> instead of in the mvme5500 tree!) will help.



Kate is on vacation but I have asked her to try to eliminate the BSP
specific pci.h in the MVME5500.  The long term goal is that 
<rtems/pci.h> should completely define the PCI API.

For now, just eliminating the mvme5500's pci.h and including the one 
from powerpc/shared/pci would be a big step.  Then my work on 
eliminating the powerpc/shared/pci/pci.h file and using the shared ones 
will naturally pick up the mvme5500.  For now, I am ignoring it.

Till suggested that the use of pci0_* and pci1_ constants and functions 
was an indication that the bus number parameter should have been
used,  Using it would eliminate a lot.  Then the PCI[01]_ stuff in that
pci.h can be eliminated.

> Thanks,
>
> Peter
>
> Peter Dufault
> HD Associates, Inc.


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