Date: Fri, 23 Oct 1998 09:32:27 +0200 (MET DST) From: Nick Hibma <nick.hibma@jrc.it> To: FreeBSD hackers mailing list <hackers@FreeBSD.ORG> Subject: Re: multi-user: multiple consoles in FreeBSD Message-ID: <Pine.GSO.3.95q.981023093009.18824e-100000@elect8> In-Reply-To: <199810230127.SAA02423@dingo.cdrom.com>
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Guys, Would it be possible to remove non appropriate individuals from the reply-to lines? I do read the hackers list. And this morning I was swamped with duplicates. Greg, if you could give me/the list (probably more than me alone who might have a spare monitor somewhere to play with) a hint on which cards you have been able to do this with, I could appreciate a hint. The same brand is needed for all the cards or does that not matter? Nick On Thu, 22 Oct 1998, Mike Smith wrote: > > > 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. > > Yes, although they're not in our hands. > > > > 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. > > There are several components which need to play "nice" for it to work. > > The system BIOS has to do the "right thing" when it's setting the > PCI interfaces on the cards up; it needs to deal with the case where > it's got more than one device that says it's a VGA adapter, and only > map one of them in. If it's stupid it may crash or map them both > (which would probably hang the bus). > > Then the BIOS on the card that doesn't have the compatibility mappings > has to realise the fact. If it doesn't, it will try to talk to the > registers as though they were for it, which would be bad. It might be > less bad if all the cards were identical. > > Since Jason claims to have tested this and failed, while I know that you > have at least one well-behaved card, it seems to be a bit of a mixed > bag. I wonder if the current crop of ATI cards still work? I've got a > pair of Rage 3DII's here I could try it with. > > > -- > \\ Sometimes you're ahead, \\ Mike Smith > \\ sometimes you're behind. \\ mike@smith.net.au > \\ The race is long, and in the \\ msmith@freebsd.org > \\ end it's only with yourself. \\ msmith@cdrom.com > > > -- STA-ISIS, T.P.270, Joint Research Centre, 21020 Ispra, Italy To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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