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From: Jung-uk Kim <jkim@FreeBSD.org>
To: Andriy Gapon <avg@freebsd.org>
Date: Tue, 7 Jun 2011 15:31:58 -0400
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
	src-committers@freebsd.org, John Baldwin <jhb@freebsd.org>
Subject: Re: svn commit: r222795 - head/sys/dev/atkbdc
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On Tuesday 07 June 2011 03:08 pm, Andriy Gapon wrote:
> on 07/06/2011 21:02 John Baldwin said the following:
> > On Tuesday, June 07, 2011 11:39:26 am Jung-uk Kim wrote:
> >> On Tuesday 07 June 2011 09:52 am, John Baldwin wrote:
> >> The whole point of this commit is to blacklist *recent* BIOS (or
> >> CSM) from probing keyboard typematic information, more
> >> specifically, recent Intel chipset platforms.  They don't
> >> support many INT 15h/16h functions but only cause trouble at
> >> best.  OTOH, I haven't seen such problems with AMD chipset
> >> systems and they all seem to have traditional entry points at
> >> the interrupt vector table, for example.
> >
> > Err, but you didn't blacklist recent BIOS.  You blacklist _all_
> > BIOS that use entry points other than the ones from the UEFI
> > spec, including BIOSes that don't claim to support UEFI and the
> > BIOS from the two systems I quoted.
>
> I'd like to simply add two datapoints:
> 1) recent AMD system:
>
> $ dd if=/dev/mem bs=4 iseek=0x15 count=2 | hd
> 00000000  59 f8 00 f0 2e e8 00 f0

Yes, that's exactly what I am seeing from all of my AMD systems and a 
11-year old Pentium III system.

> 2) very old PIIX/440BX system (manufactured ~1999):
> $ dd if=/dev/mem bs=4 iseek=0x15 count=2 | hd
> 00000000  9a 06 b8 9c 2e e8 00 f0

INT 15h is relocated under 0xa0000, i.e., "highmem".  Are you using 
non-FreeBSD chain loader?  Do you have "relocate to highmem" option 
in the BIOS configuration?  Most importantly, does it support 
keyboard typematic feature?

Jung-uk Kim