Computer hangs on reboot

[Andrey Shuvikov]

On 5/29/07, John Baldwin <jhb at freebsd.org> wrote:
> On Saturday 26 May 2007 01:14:52 pm Andrey Shuvikov wrote:
> > I tried to add some debug output to cpu_reset_real() code:
> >
> >   printf("cpu_reset_real(): before keyboard reset\n");
> >   outb(IO_KBD + 4, 0xFE);
> >   printf("cpu_reset_real(): after keyboard reset\n");
> >
> > The last two lines I see on the screen when I try to reboot are:
> >
> > cpu_reset_real(): before keyboard reset
> > c
> >
> > So the computer is halted but doesn't go to reboot.
>
> So what if you disable the keyboard reset and let the other methods happen?
>
> --
> John Baldwin
>

I tried to set BROKEN_KEYBOARD_RESET option but nothing changed
(except that I didn't see these debugging messages, obviously). Is it
possible that keyboard controller issues the reset signal but the CPU
waits for something? Or reset pin is disabled somehow?