Hey list,
I'm trying to get uart5 to work on a setup here, and am having some
strange issues.
I tried this on stage-3.4 but couldn't get any output, so I quickly
switched over to mainline without going to deep into this.
I've configured uart0, uart2, uart5 and uart6 to do some tests. Using
luc's serial noise program I get spammed with /dev/ttyS%d (i adapted it
from USB%d) and see those strings on a logic analyizer, scope and
several USB to serial converters.
However uart2 is giving me headaches. The output is prepended with
random junk:
(hope copy paste works)
���^E^B^@!@�^H^@^@!^BB�^H!/dev/ttyS2
B^@^H^P�@�^@^B^@�/dev/ttyS2
/d^C ^E^B/ttyS2
/dev/ttyS2
^B^H/dev/ttyS2
occasionally, somehow it 'sticks' and from then on just outputs
/dev/ttyS2 in a row and remains okay. Restarting serial_noise breaks it
again and it may remain broken for ages or sometimes picks up again and
continues to work. What strikes me is that the end always is the string
I expect (with the exception where backspace and delete characters break
things).
On the scope i see perfect squares, so it's not a electrical noise
thing. I will next test with uart3 added, and uart2 (and 3, 6) removed
to see if that matters. But so far, it looks like uart5 is ... somehow
broken.
I tested this on two sun4i lime's and 1 sun7i lime.
I'm just baffled ...
Olliver
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