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> The BeagleBoard-xM has the shield grounded to frame ground which connects
> to the system ground through a resistor, R119. The original BeagleBoard
> version does not have the connector shield grounded. Only the signals in
> the cable are grounded..
Interesting. Best EMC practice suggests that connector shells should
be grounded at as many points as possible, as directly as possible,
which means all the shield pins/pads should go directly to the ground
plane. You really don't want the inductance of a resistor in the way,
low as it might be in absolute terms; it's high in EMC terms.