Can you actually trust that pl2303 module? They're not exactly known for being trouble free, and have often been cloned in the past as well, with varyings levels of success. Do you have a cp210x or ft23x at all? This is one of the great pitfalls of loopback testing, it doesn't test that anything really does what it says, just that it does whatever it does consistently. Sincerely, Karl P Russell Senior <russell@xxxxxxxxxxxxxxxxx> wrote: > > Also, when the above change makes usb-linus works, does changing the > > word size appear to work after probe? > > I'm not sure what changing the word size is supposed to do. The > usb-linus + previous patch in loopback seems to work with > minicom regardless of wordsize. More so even than I would guess > at 5N1: a -> a, A -> A. Trying to talk with a pl2303, 8N1 on > both sides works. 7E1 works sending from ch341 to pl2303, but > not pl2303 to ch341 (text is garbled on reception). 6N1 is > garbled in both directions, but differently. > > > Russell
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