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

[Tomasz Chmielewski]

As a follow up to "i8042.c: No controller found..." thread - below are 
the scancodes which Linux receives, and a comment from a former i8042 
Linux maintainer (Vojtech Pavlik fro SuSE Labs):


> May 20 12:25:09: 18 81 7f 18 81 7f 18 8e 53 28 00 ff 28 00

> May 20 13:45:43: 09 00 00 08 00 00 18 ff 00 18 ff 00 18 fe 01 08

> May 20 13:57:06: 08 7f 7b 08 7f 00 08 26 00 28 00 fc 38 fe fa 38

> May 20 14:01:55: 38 ea 97 28 00 ff 28 00 ff 28 00 ff 28 00 ff 28 00 ff 28 00 ff 
> 38 ff ff 28 00 ff 28 00 ff 28 00

> May 20 14:14:35: 28 00 ff 28 00 fe 28 00 f9 38 ff f7 28 00 f8 38 fd f2 38 f7 cb 
> 38 fe f5 38 fc e3 38 fe f2 38 fe f2 38 fe f1 38 fe f0 38 fe f1 38 fe f2 38 fe 
> f5 38 fe f5

> May 20 14:15:01: 18 f9 01 18 ff 02 08 00 02 08 00 03 18 fe 06 18 fe 07 18 fc 09 
> 18 fd 09 18 fb 09 18 fa 0a 18 fe 0b 18 fb 08 18 fe 07 18 ff 03 08 00 01 08 00 
> 01 08 00 01 09 00 00 08 00 00 08 00 01 28 00 fe 38 ff ff 28 00 fe 18 ff 00 28 
> 00 ff 18 ff 00 28 00 ff 18 ff 00 09 00 00 08 00 00 18 fb 00 18 f8 00 18 f9 00 
> 18 fe 00 18 ff 01 18 fe 01 18 f9 02 18 fe 00 09 00 00

> May 20 14:20:54: 09 00 00 08 00 00 18 ff 00 18 fc 00 18 fa 00 18 f9 00 18 f9 00 18 fa 00 18 f8 00 18 f7 00 18 f8 00 18 fa 00 18 fa 00 18 fa 00 18 fa 00 18 fc 00 18 fc 00 18 fd 00 38 ff ff 18 ff 00 18 ff 00 18 ff 00 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 Chmielewski
http://wpkg.org