[SeaBIOS] [coreboot] Keyboard not working on Thinkpad X60/T60

Kevin O'Connor kevin at koconnor.net
Sat May 7 19:01:59 CEST 2011

On Wed, May 04, 2011 at 10:16:17AM +0200, Sven Schnelle wrote:
> >>> Will do. But right now i have the problem that the Keyboard isn't
> >>> working on cold boot - seabios is probably started so early that some
> >>> hardware parts are not finished with reset or similar things.
> I've just modified seabios to resend commands when 0xfe is received as a
> quick hack. It makes my keyboard working again. I'm not sure if SeabIOS
> should handle 0xfe as RESEND or not - have not monitored much Keyboards,
> and don't know wether this has any side effects.

Some ps2 ports send NAK (0xfe) when there is no keyboard plugged in.
The detection for NAK was added so that it doesn't take a full second
to recognize that no keyboard is present.  The patch you sent would
loop infinitely in this situation.

It's possible to have ps2_send_byte() attempt a resend on each NAK and
use the timer to detect when to stop.  However, that will re-introduce
the problem of having to wait a second when there is no keyboard

Do you know how long it takes for your keyboard to become responsive?
(You can pass "-n" to tools/readserial.py to have it report wall times
instead of adjusted times.)

Have you considerd using a USB keyboard?  :-)

BTW, if you want to improve boot time, setting


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