Date: Fri, 13 Oct 1995 17:19:30 -0700 (MST) From: Terry Lambert <terry@lambert.org> To: bde@zeta.org.au (Bruce Evans) Cc: martin@victor.innovus.com, serg@bcs1.bcs.zaporizhzhe.ua, hackers@FreeBSD.ORG Subject: Re: netboot patch Message-ID: <199510140019.RAA18688@phaeton.artisoft.com> In-Reply-To: <199510140008.KAA25340@godzilla.zeta.org.au> from "Bruce Evans" at Oct 14, 95 10:08:09 am
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> The standard boot loader probably doesn't need this because it doesn't > support an 'N' question. It seems unlikely that there are any BIOSes > sensitive to the segment limits. It's more likely that there are > BIOSes sensitive to gateA20, and we don't bother switching gateA20 > back and forth. Gate A20 is definitely a problem on some keyboard controller based reset sequences. I think it is the major missing piece of the puzzle there, in fact. As far as BIOS sensistivity, there are many ISA cards that do not implement full I/O space decoding, meaning that it looks as if the I/O space is repeating. This seems to result in more conflicts than all other causes put together, especially when the offender is a cheap serial board or a Diamond video card. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
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