Re: [PATCH] [9/50] i386: validate against ACPI motherboard resources

[H. Peter Anvin]

Yinghai Lu wrote:
>>> We all know how correct ACPI tables are. Specifications are nice,
>>> reality tells a different story.
>> MMCONFIG can't be used without ACPI in any case unless we know where the
>>   table is using chipset-specific knowledge (i.e. reading the registers
>> directly). Doing that without being told that this area is really
>> intended to be used, via the ACPI table, is dangerous, i.e. we don't
>> necessarily know if the MMCONFIG is broken on the platform in some way
>> we can't detect.
> 
> the BIOS get these info from the chipset too.
> for AMD Fam 10h opteron, we can read that MSR for MMCONFIG base.

I think he's saying we don't know a safe place to park the MMCONFIG area
if we don't have this information.  However, this applies to *any*
allocation of address space, which we do all the time, so although a
valid argument this has been decided already many times over.

	-hpa
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