Re: [Qemu-devel] [Fwd: Re: i8042 buffer size?]

[Tomasz Chmielewski <mangoo@wpkg.org>]

Tomasz Chmielewski wrote:
> Marcelo Tosatti wrote:
> 
>>>> 18 ff 00 18 ff 00 18 ff 00 18 fe 00 18 ff 00 18 ff 00 18 fe 00 18 ff 
>>>> 00 18 ff 00 18 ff 00 18 ff 00 18 ff 00 18 ff 00 08 00 01 18 ff 00 18 
>>>> ff 00 18 ff 01 18 ff 00 08 00 01 18 ff 00 18 fe 02 18 ff 00 18 ff 00 
>>>> 18 ff 01 18 fd 00 18 fd 00 18 fa 00 18 f7 00 18 f7 00 18 f4 00 18 f3 
>>>> 00 18 ef 00 18 ee 01 18 ed 03 18 ec 04 18 e9 02 08 7f 08 08 7f 00 08 
>>>> 44 00 09 00 00 19 fc 01 08 00 00 38 81 ff 18 92 00 
>>> This looks seriously like uninitialized memory (12-bit FAT perhaps?) -
>>> and very much like a Qemu bug. It doesn't even make sense if interpreted
>>> as keyboard scancodes - 00 is reserved and ff is an error condition.
>>
>> Tomasz,
>> Can you provide a recipe on how to reproduce this?
> 
> I used it with KVM, but it doesn't look KVM specific. I'll see if it 
> happens with "pure" Qemu.

I just reproduced it with "pure" Qemu, no kqemu or kvm module.

I booted off SystemRescueCd: http://www.sysresccd.org/Download

The system was started with this command line:

/usr/bin/qemu -boot d -m 256 -cdrom 
'/usr/src/systemrescuecd-x86-1.2.0.iso' -net nic,vlan=0 -net user,vlan=0 
-localtime &


I was just tapping the keys on the keyboard during BIOS phase, 
bootloader and kernel booting.


-- 
Tomasz Chmielewski
http://wpkg.org