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Date: Mon, 08 Jun 2009 15:51:14 +0200
From: Tomasz Chmielewski <mangoo@wpkg.org>
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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

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.


-- 
Tomasz Chmielewski
http://wpkg.org