Date: Wed, 19 May 1999 09:41:47 -0700 From: Mike Smith <mike@smith.net.au> To: Luoqi Chen <luoqi@watermarkgroup.com> Cc: jerry.alexandratos@perspectives.net, jlemon@americantv.com, ctapang@easystreet.com, current@FreeBSD.ORG Subject: Re: FBSDBOOT.EXE Message-ID: <199905191641.JAA03143@dingo.cdrom.com> In-Reply-To: Your message of "Wed, 19 May 1999 08:27:23 EDT." <199905191227.IAA11701@lor.watermarkgroup.com>
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> > Jonathan Lemon <jlemon@americantv.com> says: > > : > > : Not true. VM86 is also required to support VESA. Also, it is used > > : for reliable memory detection (which is why I want to make it mandatory). > > : No more "My Stinkpad only detected 64M, what do I do now??!" questions. > > > > Actually, even with VM86, the kernel still doesn't correctly detect the > > StinkPad's memory. This is because the BIOS probe results are still ignored. 8( > It just occurred to me that we might be able to use initial MTRR settings > by BIOS for memory detection (P6 and above, of course). Don't know how > reliable that is. Not at all. If there's 640k chopped off the end of eg. 128M of physical memory, you'd have to use a 64M segment, a 32M segment, a 16M segment, an 8M segment, a 4M segment, a 2M segment, a 1M segment, a 256k segment and a 128k segment to map it accurately. That's 9 variable MTRRs, and the P6 only has 8. -- \\ The mind's the standard \\ Mike Smith \\ of the man. \\ msmith@freebsd.org \\ -- Joseph Merrick \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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