>I wrote:
>
>> It seems recent kernels no longer support too old filesystems.
> :
>> So I guess it's better to update the Mkfs tool for MacOS
>> rather than adding complicated hacks to our ffs code.
>
>After some printf debug, it turns out that
>the problem is not so complicated.
>
>Could anyone try the following patch or 3.1_STABLE kernel?
>
>http://www.ceres.dti.ne.jp/~tsutsui/netbsd/netbsd-mac68k-GENERIC-3.1_STABLE-ffs
>fix.gz

It works fine for me too.  Hope it becomes part of the "official" 3.1
GENERIC kernel.  Thanks to all for being so responsive to this problem.

Tom