Messages in this thread | | | Date | Mon, 31 Dec 2007 15:39:02 +0100 (CET) | From | Bodo Eggert <> | Subject | Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override |
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On Sun, 30 Dec 2007, Alan Cox wrote: > On Sun, 30 Dec 2007 12:53:02 -0800 > "H. Peter Anvin" <hpa@zytor.com> wrote: > > Bodo Eggert wrote:
> > > I've never seen code which would do that, and it was not suggested by any > > > tutorial I ever saw. I'd expect any machine to break on all kinds of software > > > if it required this. The only thing I remember being warned about is writing > > > the index and the data register at the same time using outw, because that > > > would write both registers at the same time on 16-bit-cards. > > > > > > > And we use that, and have been for 15 years. I haven't seen any screams > > of pain about it. > > Actually there were, and I sent numerous people patches for that back in > ISA days.
Are you talking about VGA cards requiring a delay between outb index/outb data, VGA cards barfing on outw or systems barfing on outb(0x80,42)? -- Programming is an art form that fights back.
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