netconsole fun

Is there a recommended method of running netconsole on a machine that
has a slaved device?

I ask because it seems pretty difficult to get netconsole running even
on a machine that has multiple physical interfaces, only one of which is
slaved.

I scoured the documentation but didn't find anything relevant (does
documentation/networking/netconsole.txt need a patch?). AFAICT, the last
discussion ended here back in June '11
http://lkml.indiana.edu/hypermail/linux/kernel/1106.1/03185.html 

Any help or pointers provided would be much appreciated.

Regards,
Peter Hurley