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port-macppc/41484: NetBSD/macppc 5.0 hangs when detecting FireWire ports on 3nd gen. iMac

>Number:         41484
>Category:       port-macppc
>Synopsis:       NetBSD/macppc 5.0 hangs when detecting FireWire ports on 3nd 
>gen. iMac
>Confidential:   no
>Severity:       critical
>Priority:       low
>Responsible:    port-macppc-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun May 24 20:25:00 +0000 2009
>Originator:     Dave Vollenweider
>Release:        5.0
NetBSD 5.0 NetBSD 5.0 (GENERIC) #0: Sun Apr 26 22:53:55 
UTC 2009

When booting the GENERIC kernel on NetBSD 5.0 on a third-generation iMac 
(slot-loading model), there is a problem with the ieee1394if device, as shortly 
after the start of booting the kernel displays a message about a problem with 
the bus on this device, then the kernel detects the devices on the IDE buses 
and then freezes.  This problem did not exist in previous NetBSD releases.
Simply boot the system normally.
A workaround is to boot the kernel with the -c option and disable the 
ieee1394if* device (number 203 in the userconfig list).  Building a custom 
kernel with the same device disabled will also make it work.  Unfortunately 
this means that FireWire support is disabled.

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