As I posted earlier on, a sd(4) device shows up.. indicating it's just in a sort of passthrough mode for the MMC slot (..memory stick).
Look on your device for any ability to switch modes, posting the complete dmesg output would also be kind.. just so we're positive you're not truncating the output.
You may end up having to modify one of the drivers attach functions.. so that something other than umass will attach.
I still say there may be a mode selection feature on the device itself, something user configurable.. does it have a screen or any sort of buttons?
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