Hmm,
I have no experience with that particular board but as far as I know 
most mips systems have 32 bit address bus. What mips core is on that board?
If this is alchemy core it is only 14 bit address bus, so I can't see 
how you can address 36bit address space. It also looks like 32 bit mips 
which makes it questionable about 36 bit access as well.

I may be wrong here but I think you are mistaking about 36 bit address 
space.

Regards,
Alex


Garrett D'Amore wrote:
> Hi all,
> 
> I'm trying to add support for Au1500/1550 PCI.  On the Au1550, PCI space 
> is accessed from a 36-bit address space, where the upper 4 bits are 
> nonzero.  (In other words above 4GB.)
> 
> What is not obvious to me is how do I arrange for access to such a 
> physical address.  The Au1550 spec says you have to use a TLB entry for 
> this.  I'm trying to figure out how to go about doing this within the 
> NetBSD memory system.
> 
> Anyone with experience doing similar things on other MIPS processors 
> have any advice about what I should be looking at?  FYI, this is my 
> first experience with MIPS in nearly two decades, and I'm also new to 
> NetBSD.  Guess I could have picked an easier thing to start with, huh? :-)
> 
> Thanks!
> 
>    -- Garrett
> 
> 
> 
>