svn commit: r222795 - head/sys/dev/atkbdc

[Andriy Gapon]

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

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

-- 
Andriy Gapon