The setup Linux/1394b - 9-to-6-pin cable - 1394b HDD --- Linux/1394b does not work: Ping says "Destination Host Unreachable". This setup forces the bus to work at S400(A) and looks exactly like an S400B bus. This coincides with a report that I got via personal mail: eth1394 does not work on an S400B bus because no GASP packets are sent.
Created attachment 11256 [details] ieee1394: eth1394: send async streams at S100 on 1394b buses Works for me.
fix merged for Linux 2.6.22-rc1