Enhance speed detection

Sean Bruno sean.bruno at dsl-only.net
Mon Feb 16 15:57:29 PST 2009

If speed of link between two devices is slower than the reported max
speed of both endpoints, the current driver will fail and be unable to

Test negotiated speed by reading the CSRROM into a dummy variable.
If that read fails, decrement our speed and retry.  If all else fails,
go to lowest speed possible.

Report speed to the user.
Add display of the Bus Info Block when debug.firewire_debug > 1
Support the Bus Info Block(1394a-2000) method of speed detection.

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