In general it is well possible to single step anything in the
kernel. You might find occasions where things stop working, and odd
cases were things all of a sudden start working, but normally, apart
from hardware things, most things are not time critical, or create
problems through spin locks.
You can single step at boot time, by setting the flags in the loader.
set boot_ddb # jump to debugger
set boot_gdb # use remote gdb for debugging by default
Hope this helps.
Nick
> I've used softice for debugging under windows, and i was wondering if gdb
> offers similar capabilities. It seems the best way to debug the ECP
> parallel port problem is to step through the code during the boot phase.
> Can this be done, or is there too much timing-critical stuff going on then?
>
> jm
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