Re: Setting up MTRRs for 4096MB RAM
H. Peter Anvin (hpa@zytor.com)
Thu, 09 Aug 2001 11:50:56 -0700
Tim Walberg wrote:
> On 08/09/2001 10:53 -0700, H. Peter Anvin wrote:
>
>>>
>>> Intel MTRRs have to be a multiple of 2, so you'd need 2 MTRRs if you
>>> wanted to cover 3 GB. 0x80000000 is a multiple of 2; 0xC0000000
>>> isn't, and 0xFFFFFFFF definitely isn't, although 0x100000000 is.
>>>
>
> Since when? Seems to me bit 0 of 0xC0000000 is 0, therefore it is
> a multiple of two. Perhaps you meant "power of 2" (i.e. only one bit
> set in the binary representation)?
>
Yes, power of 2.
-hpa
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