Subject: Re: apic timing/clock problem in 4.0_RC3, MacBook 2x2.0
To: None <>
From: Marco Trillo <>
List: port-i386
Date: 11/10/2007 20:32:04

On 11/10/07, Thor Lancelot Simon <> wrote:
> On Sat, Nov 10, 2007 at 07:53:15PM +0000, Marco Trillo wrote:
> >
> > OTOH since all of these Macs use ICH7, it should no no harm to disable this bit.
> It's not just ICH7, though, right?  Macs are unusual in that they don't
> have (or don't use) BIOS options for keyboard or boot device emulation
> that would require legacy USB emulation turned on.

Maybe these legacy USB features are enabled by the BIOS emulation in
the firmware; the Mac OS doesn't use the BIOS emulation, so it would
be unaffected.

This quote is from the ICH7 spec:

5.19.8 USB Legacy Keyboard Operation
When a USB keyboard is plugged into the system, and a standard
keyboard is not [...] MS-DOS legacy software will not run [...] The
ICH7 implements a series of trapping operations [...] performed
through SMM space.