[Gumstix-users] Serial Port problem

[<gu...@al...>]

  Hi, I've got a, fairly recent, Gumstix connex 400xm-bt which I haven't done much with yet.  I've talked to it through its serial port ok - but now when I power it up - it prints garbage which looks like a bit like it's running at the wrong baud rate.

  Has the Gumstix UART failed?  Is there some more testing I can do?

  I can connect to it fine through ssh running over the USB port and 
# stty -a < /dev/ttyS0
speed 115200 baud; rows 0; columns 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
eol2 = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W;
lnext = ^V; flush = ^O; min = 1; time = 0;
-parenb -parodd cs8 hupcl -cstopb cread clocal -crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr -icrnl -ixon
-ixoff -iuclc -ixany -imaxbel
-opost -olcuc -ocrnl -onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0
ff0
-isig -icanon -iexten -echo -echoe -echok -echonl -noflsh -xcase -tostop
-echoprt -echoctl -echoke

  so it thinks it's running at the right speed.  Just in case, I've tried different baud rates on the PC communication side - but can't find anything that works.

  Loop-back on the PC serial port is ok (though this won't verify speed is correct).  I've tried talking to the other serial port STUART /dev/ttyS2 but that doesn't seem to give any response at all.  Putting a loop-back wire on the second serial port and:
# cat /dev/ttyS2 &
# echo abcd > /dev/ttyS2

  doesn't seem echo anything either.  Is it worth disabling the getty on ttyS0 and trying a loop-back on that?

  Should I send it back or have I overlooked something silly here?

  Thanks for any help,

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