#uname -a
Linux tz-hpmini 2.6.28-15-generic #49-Ubuntu SMP Tue Aug 18 18:40:08 UTC 2009 
i686 GNU/Linux

Does not fix this.  It sounds like my problem, but only happens when the buffer 
overruns.
I will try one of the 2.6.29 kernels and/or Karmic when I get a chance.

For example, using 
http://www.sparkfun.com/commerce/product_info.php?products_id=9115 (or the 3.3v 
version) and shorting TXO to RXI, then do (at 57600/pass8):
 cat /dev/ttyUSB0
 cat testfile >/dev/ttyUSB0
it will work, and it will work if you just send a small file with the second 
command then run the first.  But if you copy a larger file (I don't know the 
precise boundary) it will lock up, fail, and require a reboot.

I generally can't get it to lock up if there is something reading all
the characters back, or the data rate of the input is slow (even if I
leave it for a short while, but more than long enough to get any local
buffers filled up).

t...@tz-hpmini:~/Downloads/pulse1$ cat logs/acc3.log >/dev/ttyUSB0 
bash: /dev/ttyUSB0: Input/output error

After it locks up:

t...@tz-hpmini:~/sbnok/tzgpsd/minigpsd-0.31/sample+utils$ lsmod | grep ft
ftdi_sio               56968  0 
usbserial              39656  2 ftdi_sio

-- 
ftdi_sio doesnt work propertly
https://bugs.launchpad.net/bugs/376128
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