From: "H. Peter Anvin" <hpa@zytor.com>
To: Tim Walberg <twalberg@mindspring.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Setting up MTRRs for 4096MB RAM
Date: Thu, 09 Aug 2001 11:50:56 -0700 [thread overview]
Message-ID: <3B72DB90.5060502@zytor.com> (raw)
In-Reply-To: <Pine.LNX.4.21.0108091306550.18150-100000@willow.commerce.uk.net> <9kuils$q67$1@cesium.transmeta.com> <20010809130641.B10425@mindspring.com>
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
prev parent reply other threads:[~2001-08-09 18:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-09 12:18 Setting up MTRRs for 4096MB RAM Corin Hartland-Swann
2001-08-09 17:53 ` H. Peter Anvin
2001-08-09 18:06 ` Tim Walberg
2001-08-09 18:50 ` H. Peter Anvin [this message]
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