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Re: [Qemu-devel] [SOLUTION] "i8042.c: No controller found" -> OS sees no


From: Tomasz Chmielewski
Subject: Re: [Qemu-devel] [SOLUTION] "i8042.c: No controller found" -> OS sees no keyboard if I type "in BIOS"
Date: Mon, 08 Jun 2009 16:13:09 +0200
User-agent: Thunderbird 2.0.0.21 (X11/20090319)

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




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