Re: cardbus memory allocation problem

On Tuesday, May 03, 2011 7:49:29 pm Michael Butler wrote:
> > I have WIP patches to fix this but they aren't ready yet.
> >
> >> pcib4:   I/O decode        0x4000-0x4fff
> >> pcib4:   memory decode     0xf0900000-0xf09fffff
> >>  *** this memory widow is what I expected all children to allocate from
> >>
> >> pcib4:   no prefetched decode
> >> pcib4:   Subtractively decoded bridge.
> >
> > It's a subtractive bridge, so the resources do not have to be allocated from
> > the window.  That said, I'm committing the last of my patches to HEAD today to
> > rework how PCI-PCI bridges handle I/O windows to support growing windows, etc.
> > and the new PCI-PCI bridge driver will attempt to grow the memory window to
> > allocate a new range before falling back to depending on the subtractive
> > decode.
> 
> You might be pleased to hear that, without any "special arrangements" in
> loader.conf, the new PCI-PCI code does The Right Thing with memory
> allocation :-)
> 
> Parent bridge:
> 
> I "fixed" the subordinate bus using "setpci -s 07:06.2 4c.b=02"

I believe it should work even if you don't disable subtractive decoding.

-- 
John Baldwin