>>>>> James Mansion writes:

James> Does anyone know if the boot problem introduced a while back
James> that prevented booting on some models of C3 chip has been fixed
James> on mailline or whatever?

The committed work-around works for some but not for all. See:

    http://www.NetBSD.org/cgi-bin/query-pr-single.pl?number=26007

James> Could I use grub to boot NetBSD?

Yes you can do that but it may be a bit problematic to get
bootstrapped if the NetBSD installation media does not boot for you...

Best regards,

        -- Urban