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

[John Baldwin]

On Wednesday 06 October 2004 03:22 am, Warner Losh wrote:
> imp         2004-10-06 07:22:58 UTC
>
>   FreeBSD src repository
>
>   Modified files:
>     sys/i386/pci         pci_bus.c
>   Log:
>   For legacy PCI bridges, limit memory allocation to the top 32MB of
>   RAM.  Many older, legacy bridges only allow allocation from this
>   range.  This only appies to devices who don't have their memory
>   assigned by the BIOS (since we allocate the ranges so assigned
>   exactly), so should have minimal impact.
>
>   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.

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org