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Serial ports on SA-1100


I have an custom-port SA-1100 based system which appears to be (otherwise)
functioning properly.  I'm trying to do some serial I/O in my main()
function.  I've tried reading and writing data to either /dev/ttydiag
(pointed to port 0) or to /dev/ser1, but in both cases the cyg_io_lookup
works fine, and cyg_io_write and cyg_io_read return -EDEVNOSUPP (-202).

I'm not explicitly starting the scheduler in cyg_user_start() - my
understanding was that if I have not overriden cyg_start(), that is done for
me.  (The code is definitely making it into main(), so I think that part is
okay anyway.)

Any idea what I could be doing wrong?

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