Date: Thu, 6 Nov 1997 09:46:16 -0800 From: John-Mark Gurney <gurney_j@efn.org> To: Chuck Robey <chuckr@glue.umd.edu> Cc: Mike Smith <mike@smith.net.au>, Tony Overfield <tony@dell.com>, Terry Lambert <tlambert@primenet.com>, jamil@trojanhorse.ml.org, hackers@FreeBSD.ORG, Jonathan Mini <j_mini@efn.org> Subject: Re: >64MB Message-ID: <19971106094616.51849@hydrogen.nike.efn.org> In-Reply-To: <Pine.BSF.3.96.971106073452.7018C-100000@picnic.mat.net>; from Chuck Robey on Thu, Nov 06, 1997 at 07:40:21AM -0500 References: <199711061242.XAA00382@word.smith.net.au> <Pine.BSF.3.96.971106073452.7018C-100000@picnic.mat.net>
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Chuck Robey scribbled this message on Nov 6: > On Thu, 6 Nov 1997, Mike Smith wrote: > > > > > > > Speaking of vm86(), why not just use real-mode? It's easier and much > > > better for compatibility while booting. > > > > How do you copy the kernel into memory > 1M in real mode? If you could > > elaborate on this (and how to *stay* in real mode while running over > > 1M, ie. so that the kzip pass and subsequent real-mode startup > > requirements could be met), I'd be *very*happy* > > Huh? Is that the limitation? I haven't personally used them, but there > are methods to do this, if you can go into protected mode first, set > limits, then go back to real mode. Can you do that one? If so, I'll > personally test such a thing, I can do that here. > > The method I'm talking about is commonly known (among those that use it) > as voodoo memory, I think. The word voodoo is in there somewhere, > anyways. Some game folks have written programs that run completely in > such a environment, although that seems really unsafe to me. The limits > you set in pmode stay active in real-mode. yep... I've heard of this (they called it Un-real mode :) )... but basicly you set your registers to a 4gig limit instead of the 64k limit that they have normally... I've bounced your message, Mike, to a friend of mine (Jonathan Mini) who will be able to help with this... he was quite surprised that we kept flipping between real and protected mode when he first saw the boot blocks... > I haven't addressed this before, so if this is completely off-base, you > can ignore me. nope... I've seen this before... so you arnaren't.. :) -- John-Mark Gurney Modem/FAX: +1 541 683 6954 Cu Networking Live in Peace, destroy Micro$oft, support free software, run FreeBSD
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