I have been working with pins 9 and 10 on the Summit board to do serial
transfers (Overo Air). The voltage of the RxD1 line is at ~.33V when I power
the Gumstix. TxD1 works fine, but when I connect TxD1 and RxD1 in a
loopback, the RxD drives it low. You can still see "data" being transferred
by scoping the connection between the pins, but the level is driven so low
that RxD doesn't register them as a voltage "hi." Does anyone know why that
level would be as such, or how to mitigate the issue?
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