port-sparc64/46197: bge failure when netbooting sparc64

[cross+netbsd%distal.com@localhost]

>Number:         46197
>Category:       port-sparc64
>Synopsis:       after net-booting a bge-equipped sparc64, the kernel cannot 
>use the bge's
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-sparc64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Mar 15 02:10:00 +0000 2012
>Originator:     Chris Ross
>Release:        NetBSD 6.0_BETA
>Organization:
>Environment:
Architecture: sparc64
Machine: sparc64
>Description:
When netbooting a sparc64 netbsd-6 kernel, after the kernel loads, it's unable
to acquire an address via DHCP to load the NFS root.  DHCP is configured, and
no packets are seen by the DHCP server.  Other parties have indicated similar
failures in that bge interfaces, when netbooting, will not function to send or
recieve packets once the kernel loads.  Reportedly, the bge interfaces on
sparc64 hosts work correctly when not net-booting.
>How-To-Repeat:
Net-boot a sparc64 with a bge interface.  Once the kernel loads, it will be 
unable to acquire an address or mount an available filesystem,
>Fix: