Subject: port-macppc/12088: mc0: underflow brings interface down
To: None <gnats-bugs@netbsd.org>
From: Ben Harris <bjh21@netbsd.org>
List: netbsd-bugs
Date: 01/31/2001 08:08:19
>Number: 12088
>Category: port-macppc
>Synopsis: mc0: underflow brings interface down
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: port-macppc-maintainer
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Wed Jan 31 08:11:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator: Ben Harris
>Release: 1.5
>Organization:
>Environment:
NetBSD viking 1.5 NetBSD 1.5 (VIKING) #4: Fri Jan 26 23:16:18 GMT 2001 bjh21@viking:/usr/src/sys/arch/macppc/compile/VIKING macppc
>Description:
Recently, the mc0 built-in Ethernet on my G3-upgraded Power Macintosh 8500
spontaneously lost its IFF_UP flag (according to ifconfig(8)), and
accordingly stopped talking to the network. At about the same time, it
generated this log message:
Jan 31 00:05:40 viking /netbsd: mc0: underflow
Looking at the code in sys/arch/macppc/dev/am79c950.c, it looks like the
message is produced just before a call to mcreset(), which calls
mcstop() and mcinit(). mcstop() clears IFF_UP, but mcinit() never sets
it, so a call to mcreset() will leave the interface down, which is
probably not what is required here.
>How-To-Repeat:
Not known. The problem appeared to be spontaneous.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: