Date: Fri, 23 Oct 1998 09:35:12 +0930 From: Greg Lehey <grog@lemis.com> To: Mike Smith <mike@smith.net.au> Cc: Jason Thorpe <thorpej@nas.nasa.gov>, Nick Hibma <nick.hibma@jrc.it>, FreeBSD hackers mailing list <hackers@FreeBSD.ORG> Subject: Re: multi-user: multiple consoles in FreeBSD Message-ID: <19981023093512.Q28824@freebie.lemis.com> In-Reply-To: <199810222335.QAA01865@dingo.cdrom.com>; from Mike Smith on Thu, Oct 22, 1998 at 04:35:05PM -0700 References: <19981023085339.H28824@freebie.lemis.com> <199810222335.QAA01865@dingo.cdrom.com>
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On Thursday, 22 October 1998 at 16:35:05 -0700, Mike Smith wrote: >>> Some display controllers (notably, 3D accellerators) have a jumper >>> to disable VGA mode completely, but then you only get a memory >>> mapped frame buffer (if you're lucky :-) >> >> Hmm. I think this is your proviso. You specifically mean VGA >> compatibility. Well, yes, if you want a graphics board to conform to >> a standard which only allows one board, then you can only use one >> board. But there's more than just a frame buffer if you disable this >> feature. > > Jason's gripe was that you con't have more than one video card because > the second wants its VGA-compatibility registers mapped in the same > place as the first. Right, but there are ways to disable it. > Unless there's something really odd going on, it's relatively > trivial to simply map the I/O ranges for display cards other than > the first somewhere else; you just need the smarts in your system to > do this. > > Video chipsets not supporting this would be in violation of the PCI > spec. I wouldn't expect this to be too common. Hmmm. How would you go about doing it? It would have to be in the BIOS setup, and I can't see anything there that allows it. I suppose you could start up with one video BIOS disabled, and then enable it programmatically during the boot. Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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