Re: kgdb support in vanilla 2.6.2

[Andi Kleen]

On Wed, 03 Mar 2004 16:43:47 -0800
George Anzinger <george@xxxxxxxxxx> wrote:

> Andi Kleen wrote:
> > On Tue, Mar 02, 2004 at 01:27:51PM -0800, Andrew Morton wrote:
> > 
> >>George Anzinger <george@xxxxxxxxxx> wrote:
> >>
> >>> Often it is not clear just why we are in the stub, given that 
> >>>we trap such things as kernel page faults, NMI watchdog, BUG macros and such.
> >>
> >>Yes, that can be confusing.  A little printk on the console prior to
> >>entering the debugger would be nice.
> > 
> > 
> > What I did for kdb and panic some time ago was to flash the keyboard
> > lights. If you use a unique frequency (different from kdb 
> > and from panic) it works quite nicely.
> 
> Assuming a key board and a clear (no spin locks) path to it.  Still it only says 

I think it's reasonable to just write to the keyboard without any locking.
The keyboard driver will recover.

> we are in kgdb, now why.

The big advantage is that it works even when you are in X (like most people) 
printks are often not visible.

-Andi
> 
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