Re: [PATCH] x86/pci: make pci_mem_start to be aligned only -v4

[H. Peter Anvin]

Linus Torvalds wrote:
>>
>> 00000100-000973ff : System RAM
>> 00097400-0009ffff : reserved
>> 000a0000-000bffff : PCI Bus #00
>> 000c0000-000cffff : pnp 00:0c
>> 000e0000-000fffff : pnp 00:0c
>> 00100000-b7f9ffff : System RAM
>>   00200000-00c68f6b : Kernel code
>>   00c68f6c-01332f7f : Kernel data
>>   015a6000-01fcaa57 : Kernel bss
>>   20000000-23ffffff : GART
>> b7fa0000-b7fadfff : RAM buffer
>> b7fae000-b7faffff : System RAM
>> b7fb0000-b7fbdfff : ACPI Tables
>> b7fbe000-b7feffff : ACPI Non-volatile Storage
>> b7ff0000-b7ffffff : reserved
> 
> Hmm. That looks correct to me. We filled in that odd area between 
> b7fa0000-b7fadfff that went unmentioned in the e820 tables.
> 
> And that _is_ a really odd hole. I wonder what it is all about. But the 
> approach does seem to have done the right thing.
> 

Looks to me as through the BIOS rounded the end of available memory to a
64K boundary after subtracting the ACPI storage.  That might have been
done to work around an OS loader bug somewhere.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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