Re: [Qemu-devel] [SOLUTION] "i8042.c: No controller found" -> OS sees no keyboard if I type "in BIOS"

[Tomasz Chmielewski]

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