2008-06-05 00:20:16 How to make the linux run a program at startup?

Zhi Qiang Zhang (CHINA)

Message: 56712

Hi,

I want to make linux to run a program after startup, I add a line to /etc/rc to run my program. It is ok to run my program after startup if I connect the console by UART, but the program can't be run if I disconnect the UART console, what is the problem?

Regards,

ZhangZQ

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2008-06-05 06:33:58 Re: How to make the linux run a program at startup?

Yi Li (CHINA)

Message: 56729

Why not start the program in background using "&"?

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2008-06-05 10:28:22 Re: How to make the linux run a program at startup?

Mike Frysinger (UNITED STATES)

Message: 56733

what do you mean by "disconnect the UART console" ?

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2008-06-05 10:44:08 Re: How to make the linux run a program at startup?

Zhi Qiang Zhang (CHINA)

Message: 56738

That is not the problem. Let me explain more detail.

Supposing the /etc/rc file contains these lines

# Do random network setup

#dhcpcd &

ifconfig eth0 192.168.1.133 up

ifconfig lo 127.0.0.1

inetd &

after the system startup, the IP was set to 192.168.1.133 and there is a telnetd in the system, I can telnet to this system. Now I disconnect the the UART console cable, and power on the system, but can't telnet.

It seems that, the system can bootup and run the command specified in /etc/rc file correctly with a UART console cable plugged, while the system can't bootup without a UART console cable. Is that true?

Regards,

ZhangZQ

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2008-06-05 10:57:16 Re: How to make the linux run a program at startup?

Mike Frysinger (UNITED STATES)

Message: 56742

you have not provided a proper /etc/iniittab then. simpleinit exits because you've given it nothing to do. review your /etc/inittab and give it something to monitor.

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2008-06-05 11:26:37 Re: How to make the linux run a program at startup?

Zhi Qiang Zhang (CHINA)

Message: 56747

Here is my /etc/inittab file

root:/> cat /etc/inittab

# inittab for uClinux

# Format:

# ttyline:termcap-entry:getty-command

#inet:ttyS0:/bin/inetd

#httpd:unknown:/bin/httpd

#sh:unknown:/bin/sh

#ttyS0::respawn:-/bin/sh

#sh:console:respawn:/bin/sh

#console::askfirst:-/bin/sh

slog:unknown:/sbin/syslogd -n

klog:unknown:/sbin/klogd -n

root:/>

Is there something need to be modified? Thanks.

Regards,

ZhangZQ

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2008-06-05 11:40:29 Re: How to make the linux run a program at startup?

Mike Frysinger (UNITED STATES)

Message: 56749

so all you did was unplug the serial cable ? you didnt modify your console= in your bootargs ?

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2008-06-05 20:51:46 Re: How to make the linux run a program at startup?

Zhi Qiang Zhang (CHINA)

Message: 56776

Actually, not only unplug the serial cable, my board has not a RS-232 transceiver(such as MAX3232) in my board because it is only for debug. I made a external RS-232 transceiver module and connect to the pin TX,RX in BF531(pin 81, 82).

What I mean "unplug the serial cable" is remove that external RS-232 transceiver module, so that PIN 81, 82 will be floated. Is that the problem?

Regards,

ZhangZQ

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2008-06-05 22:45:23 Re: How to make the linux run a program at startup?

Mike Frysinger (UNITED STATES)

Message: 56779

i really dont know how you've wired things, so you'd need to hook up a different debugging channel (like jtag) to see what the Blackfin is doing

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2008-06-05 23:35:22 Re: How to make the linux run a program at startup?

Zhi Qiang Zhang (CHINA)

Message: 56781