cvs commit: src/sys/i386/pci pci_bus.c

[Nate Lawson]

M. Warner Losh wrote:
> In message: <41644490.3050005 at root.org>
>             Nate Lawson <nate at root.org> writes:
> : >>  Hoewver, for CardBus bridges (cbb), they rarely get the resources
> : >>  allocated by the BIOS, and this patch helps them greatly.  Typically
> : >>  the 'bad Vcc' messages are caused by this problem.
> : > 
> : > We really should be looking at the SMAP to find out what the real limits of 
> : > PCI space are I think since I think the SMAP includes an entry for PCI memory 
> : > mapped I/O.
> : 
> : YES!  More integrated SMAP awareness is especially important as more 
> : complex configs appear with different levels of reservation for upper 
> : memory besides just "reserved" or "available".
> 
> However, the current SMAP definition is about useless since it doesn't
> tell us directly what we need to know.  Well, it will give us an idea
> of what we can exclude, but that still leaves a gap between 'all
> that's excluded' and 'all that the host bridge passes'.

Sure, I can't remember the exact changes, I just remember that SMAP is 
going to be used soon for a lot more than just "BIOS reserved" and 
"available" memory resources.  This is due to the changing notion of the 
line between OS and BIOS.

-- 
Nate