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

[Avi Kivity]

Tomasz Chmielewski wrote:
> 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).

I think this points to a bug in the bios.  The keyboard-internal queue 
size shouldn't cause any problems.


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