cvs commit: src/sys/i386/pci pci_bus.c
nate at root.org
Wed Oct 6 12:16:35 PDT 2004
John Baldwin wrote:
> 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
>> 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.
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".
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