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Message-ID: <4A2D1C75.2040006@wpkg.org>
Date: Mon, 08 Jun 2009 16:13:09 +0200
From: Tomasz Chmielewski <mangoo@wpkg.org>
MIME-Version: 1.0
Subject: Re: [Qemu-devel] [SOLUTION] "i8042.c: No controller found" -> OS
	sees no keyboard if I type "in BIOS"
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To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, qemu-devel@nongnu.org

Tomasz Chmielewski wrote:
> Marcelo Tosatti wrote:
> 
>>> Or Qemu, for having its keyboard buffer too large (I'm not sure, but 
>>> probably 256 bytes)?
>>
>> All references (*) i could find mention 16 bytes of output buffer
>> (including the Linux source as you mentioned, which was reduced from 32
>> to 16 somewhere in the 2.6.10 era).
>>
>> http://www.computer-engineering.org/ps2protocol/
>>
>> http://linux.bkbits.net:8080/linux-2.6.28-stable/drivers/input/serio/i8042.h?PAGE=diffs&REV=4203735dp_doSExYU6ido8KnczbjzQ 
>>
>>
>> Reducing PS2_QUEUE_SIZE to 16 also makes the Linux detection loop happy.
>>
>> If QEMU claims to emulate i8042, it should be similar to real hardware.
>>
>> However i'm not familiar with PS/2 or i8042. Anthony?
> 
> This:
> 
> #define KBD_QUEUE_SIZE 256
> 
> dates back to qemu-0.5.1, where it was defined in vl.c.
> 
> Seems like it's in Qemu from the very beginning?
> 
> 
> PS2_QUEUE_SIZE 256 was introduced in qemu-0.8.0.

BTW, with "PS2_QUEUE_SIZE 16" I'm still able to trigger:

i8042.c: No controller found.


Only with "PS2_QUEUE_SIZE 15" keyboard is detected every time I boot the 
guest (unless that's what you meant by setting it to 16).


-- 
Tomasz Chmielewski
http://wpkg.org