I didn't completely absorb the bug symptoms, but here are
som suggestions:
1Maybe /dev/ttyAM0 is set for hardware flow control and
you cable and/or host isn't supplying RTS/CTS. maybe you are using
a 3 wire serial cable. RX/TX/gnd tom's rule #12
All serial cables should be full 9 or 25 wires.
2. Pull an RS-232 breakbout box from your "standard embedded
developer's toolbox" and look at lights for RTS/CTS.
3. I forget exactly where the flow control characteristics
of /dev/AM0 get set... probably in getty.conf.
4. from your telnet session on 7250 run mincom/stty/and or
cat > /dev/ttyAM0 and see if you get characters coming out the port.
5. BTW I think picocom is a much better terminal emulator
for 72XX in lieu of minicomm.
hope this helps
tc
--- In "Mike Dodd" <> wrote:
>
> --- In "Mike Dodd" <mike@> wrote:
> >
> > I'll try connecting a serial null modem from a Linux box to the 7250, and
> > see if I can get a good login. For sure, I don't trust the Windows laptop
> > with the USB-serial cable.
>
> Well.... Bad news.
>
> I confirmed that the serial port on the Linux box can talk to the USB-serial
> cable on the laptop at 115 kbps -- minicom on Linux, HyperTerm on Windows.
> Good data in both directions, one key at a time from the other end.
>
> HOWEVER, neither 7250 will log me in on the serial port. I see the standard
> boot-up messages, but there is NO response when I type 'root' at the login
> prompt. On the 'operator' 7250 (network name, static IP), I can log into
> Telnet, and the serial console displays additional messages. I can 'shutdown
> -h now' on the Telnet console, and the serial console displays the shutdown
> messages. The serial port is configured 8N1, 115200bps.
>
> Here is a link to the full minicom session
> <http://mdodd.com/files/minicom_7250.txt> and here is a link to the Telnet
> session <http://mdodd.com/files/telnet_7250.txt>.
>
> The tail-end of the minicom session, showing the serial login attempt and
> messages resulting from Telnet activity looks like this:
>
> ----------------
> Starting telnetd...
> Starting apache.../www/apache/bin/apachectl start: httpd started
>
> Technologic Systems TS-LINUX/arm 7.0
> operator login: root [NO RESPONSE ON SERIAL PORT]
>
> THIS SHOWED UP WHEN I LOGGED INTO THE 7250 USING TELNET---> login[81]: root
> login on `pts/0'
>
> ls -l [NO RESPONSE ON SERIAL PORT]
>
> THIS SHOWED UP WHEN I ISSUED 'SHUTDOWN -H NOW' ON TELNET ---> login[82]: root
> login on `pts/0'
>
> INIT: Switching to runlevel: 0
> INIT: Sending proó
> The system is going down NOW !!
> Sending SIGTERM to all processes.
> INIT: no more processes left in this runlevel
> Sending SIGKILL to all processes.
> System halted.
> ----------------
>
> I'm stumped. Why won't either 7250 log me in on the serial port?
>
> --- Mike
>
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