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SubjectRe: KGDB question
On Thu, Mar 17, 2005 at 02:29:58PM -0800, Andrew Morton wrote:
> Jesse Barnes <jbarnes@engr.sgi.com> wrote:
> >
> > > kgdb patches are maintained in -mm kernels.
> > >
> > > Patches are in
> > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.11/2.6.11
> > >-mm1/broken-out/*kgdb*
> > >
> > > And the patch application order is described in
> > >
> > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.11/2.6.11
> > >-mm1/patch-series -
> >
> > What's the latest status on these? Last I heard, some cleanup was going to
> > happen to make kgdb suitable for the mainline, did that ever happen?
>
> It part-happened, then the effort seemed to die.
>
> > Also,
> > it would be nice if I could connect to a remote kernel running the kgdb stubs
> > w/o having to run gdb on the same ethernet segment. Would that be difficult
> > to fix?
>
> <tries to remember how ethernet works>
>
> Maybe we'd have to teach kgdboe to arp for the remote debug host. I think
> Matt was talking about that a while back.
>
> <tries to remember how ethernet switches work>
>
> If switches send the destination MAC address through unchanged then maybe
> the problem is that the switch simply doesn't know the MAC address of the
> remote debug host yet? If the switch has its own MAC address (it doesn't,
> does it), or if it's actually a router then perhaps you should specify the
> router's MAC address and not the remote debug host's.

I haven't tried this, but I believe you need to set up kgdboe's
destination MAC address as the MAC of the next IP hop. Switches should
be invisible to kgdboe.

--
Mathematics is the supreme nostalgia of our time.
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