On Tue, 01 Jan 2008 20:59:20 +0100 Rene Herman <[EMAIL PROTECTED]> wrote:
> On 01-01-08 20:35, Christer Weinigel wrote: > > > On old hardware (or anything with an ISA bus which I'd guess > > includes the Geode SCx200 SoC which is basically a MediaGX > > processor, a southbridge and an ISA bus with a Super I/O chip on > > it) an out to 80h will use exactly one ISA cycle. > > Not to disagree with the point but more like 8 (1 us at 8 MHz). It's > the timeout property. Ah, sorry, you're right of course. > > I'm not sure what Alan meant with his comments about locking, but if > > changing outb_p to use an udelay means that we have to add locking, > > that is also going to affect the code size and speed. > > Explained here: > > http://lkml.org/lkml/2007/12/30/136 > > However, that's not an argument. Missing locking is a bug, and > current outb I/O delay use hiding it doesn't change that. Thanks, I had missed that one. Regarding Alan's comment: >For that matter does anyone actually have video cards old enough for us >to care actually still in use with Linux today ? I'm afraid that some PC104 systems may still use ancient video cards. /Christer -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
