Date: Tue, 24 Feb 1998 15:59:17 -0800 (PST) From: Simon Shapiro <shimon@simon-shapiro.org> To: Mike Smith <mike@smith.net.au> Cc: =?us-ascii?Q?S=F8ren?= Schmidt <sos@FreeBSD.ORG>, freebsd-current@FreeBSD.ORG, yokota@zodiac.mech.utsunomiya-u.ac.jp, (Andrzej Bialecki) <abial@nask.pl> Subject: Re: Proposed addition to panic() behaviour Message-ID: <XFMail.980224155917.shimon@simon-shapiro.org> In-Reply-To: <199802242327.PAA17047@dingo.cdrom.com>
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On 24-Feb-98 Mike Smith wrote: >> > That something is card-specific code in the BIOS ROM on the card. You >> > may see it signing on if your monitor warms up quickly enough. >> > >> > This is real-mode 8086 code which can make all sorts of assumptions >> > about the state of the machine at that point in the boot phase. Some >> > of those assumptions aren't valid when the kernel is running. (Some >> > are, but to get to a mode where you can run this code is a bit >> > daunting.) >> >> These entry points are known and standardized. since we are talking >> panic >> mode here, switching back to realmode, to reset the video card to >> standard >> VGA mode can be considrered and will have a very positive support >> impact. > > Yes, the entry points are well known and standardised. And if you want > to write some simple code that switches back to real mode, hits the > BIOS and then swaps back to the debugger call, then we'd be more than > happy to include it. I really hate to say this: Let's see if someone else who is more BIOS and real-mode fluent can pick this idea up. Last time I wrote something like this was a while ago, and I am sort of busy with other FreeBSD issues. Simon To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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