On Tue, Aug 26, 2003 at 12:36:00PM +0200, Norbert Federa wrote:
> hi,
>
> i did again some testing with several pl2303 based adapters
> under linux-2.6.0-test4.
>
> the serial apps still have severe problems.
> i've done some more testing and it seems that the first
> byte coming to the pl2303 _never_ arrives in a read() from
> /dev/ttyUSB0 - except in the _first_ read after reinsertion
> of the pl2303 based device!
>
> the problem is very easy to reproduce:
>
> just connect a serial cross link cable to /dev/ttyS0 and the
> other end to /dev/ttyUSB0 (the pl2303) and run the
> attached debug.c file.
>
> this program expects 2 params: read device and write device
> eg: ./debug /dev/ttyUSB /dev/ttyS0
>
> a test string ("Hello World") is written to argv[2] and
> the data read from argv[1] is written to stderr.
>
>
> i can reproduce the following on several uhci based boxes:
I can reproduce this too :(
Hm, wonder if the same fix I did for the io_ti driver will work here.
I'll try testing that tomorrow.
If you want to try it, look at the open() call in the io_ti driver for
the lines to add to reset the endpoints.
thanks,
greg k-h
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