Am Samstag, den 07.05.2011, 13:01 -0400 schrieb Kevin O'Connor:
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 present.
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? :-)
I do not know how to interpret your »:-)«, but to clarify Sven is using coreboot on his laptop so the non-working keyboard is the build in keyboard.
BTW, if you want to improve boot time, setting CONFIG_THREAD_OPTIONROMS should help.