lkml.org 
[lkml]   [2007]   [Dec]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
Rene Herman wrote:
>
> Well, I suppose. With stuff inline, constantly reloading dx also bloats
> things up a bit but yes, out of line who cares. Do you think this
> version is better?
>

It probably comes down to which version is bigger (you probably also
want to try uninlining.)

>> In the boot code, io_delay() is used to slow down accesses to the KBC,
>> interrupt controller, INT13h logic, and the NMI gate, and to provide a
>> fixed delay during A20 stabilization.
>
> Thanks for the heads up (also saw the SMBIOS update to this) but those
> don't seem to be a problem in fact. David Reed has been running with the
> simple udelay(2) version of this and reported no more hangs. He moreover
> reported no trouble after booting with "acpi=off" meaning that things
> seem to be fine pre-acpi which the boot code (and this io_delay_init)
> is. So I believe we get to ignore those.

Okay, so there is something inside ACPI which tickles this. Which
brings further credibility that it's activating a debugging hack,
probably inside the SuperIO/system controller chip.

It would be interesting to know exactly which part of ACPI triggers
this. I bet it is a reference to system controller namespace.

-hpa


\
 
 \ /
  Last update: 2007-12-16 22:47    [W:0.136 / U:1.324 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site