[lkml]   [2003]   [Sep]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Can we kill f inb_p, outb_p and other random I/O on port 0x80, in 2.6?
On Llu, 2003-09-22 at 17:26, Jamie Lokier wrote:
> What sort of timer chip problems do you see? Is it something that can
> be auto-detected, so that timer chip accesses can be made faster on
> boards where that is fine?

CS5520 is one example. Also VIA VP2 seems to care but only very very
occasionally. On my 386 board its reliably borked without the delays
(not sure what chipset and its ISA so harder to tell)

> I've also seen much DOS code that didn't have extra delays for
> keyboard I/Os. What sort of breakage did you observe with the
> keyboard?

DEC laptops hang is the well known example of that one.

I'm *for* making this change to udelay, it just has to start up with a
suitably pessimal udelay assumption until calibrated.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:48    [W:0.071 / U:4.864 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site