Hello,
Yesterday, I had a simular problem when I was experimenting with a
special serial mouse (external power to the mouse and its signals) to
the COM1 connector. As described I disabled the getty for safty before i
started to test some code. I did a two stage at the same time, both
change in the code and applied different voltage signals (out of control
in the test) on some of the controle signals for the serial port. I
manage to discover that the board worked fine when I had the mouse
inserted to COM1, however when I unplugged the mouse, the port IO of the
PC104 bus stopped working as well as the telnet and ftp connection but
the OS remain working and the board manage still to get data from
ethernet as well as write data to the pins of the LCD port.
I have not had any further time to look in to this, but I changed an
parameter in my code to not use CTRSCTS control, and I think that that
might solved the problem, but I have not tested it deeper because I had
some more issues on my other equipment to solve.
the code:
rt_tio.c_cflag = rt_tio.c_cflag | CLOCAL | CREAD | CRTSCTS;
And I removed the CRTSCT.
t_tio.c_cflag = rt_tio.c_cflag | CLOCAL | CREAD ;
However I don't know why this call flow should stall the IO ports of the
hardware, if it is the linuxcore or the ep93xx and how the periferal
interrupts... ?
regards, Per-Olof Åström
Per Öberg wrote:
> Hi everyone!
>
> I have a TS7250 with a homebuilt temp-sensor for the serial port. My
> problem is that I am unable to boot the TS-7250 while the temp-sensor is
> connected. If I connect the sensor and try to boot the board, the boot
> process will halt somewhere and not continue until I disconnect the
> sensor. After the boot is finished i can connect the sensor and
> everything will be working fine, regardless of what I did with the
> com-port during the boot.
>
> I have removed JP2 to disable the redboot console and I have edited
> inittab to disble getty on com-1 but it still doesn'r work. When the
> boot process has hung it is possible to ping the board but not connect
> to it via ssh. (I'm using NFS-boot)
>
> What else can i try?
>
> Regards Per Öberg
>
> --
> Per Öberg, Ph.D. Student
> Address: Division of Vehicular Systems
> Department of Electrical Engineering
> Linköpings universitet
> 581 83 Linköping, SWEDEN
> Phone: +46 (0)13-28 23 69
> e-mail: <oberg%40isy.liu.se>
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