Loading application after init

Himanshu Chauhan · External Since: Jun 19, 2006 Posts: 17

Hello all,

I am doing an embedded project based on the AT91RM9200 board. I am using
2.6.22 vanilla kernel with patches from maxim. Till now the system boots
fine and init loads the sulogin followed by busy box shell, after
booting. I have a program. That is the only program that will ever run
on the board. How can start that automatically after init. I don't want
any login prompt. Board can drop into single user mode, no problem. But
it should be all by itself. Which is the way to go?

--Himanshu

Unknown · External Since: May 06, 2005 Posts: 50

On Mon, 30 Jul 2007 21:04:17 +0530, Himanshu Chauhan wrote:

> Hello all,
>
> I am doing an embedded project based on the AT91RM9200 board. I am using
> 2.6.22 vanilla kernel with patches from maxim. Till now the system boots
> fine and init loads the sulogin followed by busy box shell, after
> booting. I have a program. That is the only program that will ever run
> on the board. How can start that automatically after init.
Put it /etc/inittab !

I don't want any login prompt.
Then comment it out of /etc/inittab

Board can drop into single user mode, no
problem. But
> it should be all by itself.

Which is the way to go?
RTFM init/inittab

rulznospam · External Since: Jul 31, 2007 Posts: 1

On Jul 31, 2:41 am, Unknown <n... RemoveThis @way.cc> wrote:
> On Mon, 30 Jul 2007 21:04:17 +0530, Himanshu Chauhan wrote:
> > Hello all,
>
> > I am doing an embedded project based on the AT91RM9200 board. I am using
> > 2.6.22 vanilla kernel with patches from maxim. Till now the system boots
> > fine and init loads the sulogin followed by busy box shell, after
> > booting. I have a program. That is the only program that will ever run
> > on the board. How can start that automatically after init.
>
> Put it /etc/inittab !
>
> I don't want any login prompt.
> Then comment it out of /etc/inittab
>
> Board can drop into single user mode, no
> problem. But
>
> > it should be all by itself.
>
> Which is the way to go?
> RTFM init/inittab

Simply:
Just run your program instead of sulogin in init
tty1::respawn:/bin/yourprog

You really should have read the manual.

You want to be confident that the program you are running is solid -
especially if you are still developing.
Having a crashing program that continually respawns just makes things
more difficult.

The other option is to launch a script from init. I guess it depends
how complex your system is and how physically secure you want it to
be.

Cheers
Marc

CptDondo · External Since: Oct 05, 2005 Posts: 309

Himanshu Chauhan wrote:
> Hello all,
>
> I am doing an embedded project based on the AT91RM9200 board. I am using
> 2.6.22 vanilla kernel with patches from maxim. Till now the system boots
> fine and init loads the sulogin followed by busy box shell, after
> booting. I have a program. That is the only program that will ever run
> on the board. How can start that automatically after init. I don't want
> any login prompt. Board can drop into single user mode, no problem. But
> it should be all by itself. Which is the way to go?
>
> --Himanshu

use init=/bin/myinit as a kernel option

then write a script called myinit, which brings up the board the way you
want and then runs your program.

Geronimo W. Christ Esq · External Since: Mar 30, 2005 Posts: 89

Himanshu Chauhan wrote:
> Hello all,
>
> I am doing an embedded project based on the AT91RM9200 board. I am using
> 2.6.22 vanilla kernel with patches from maxim. Till now the system boots
> fine and init loads the sulogin followed by busy box shell, after
> booting. I have a program. That is the only program that will ever run
> on the board. How can start that automatically after init. I don't want
> any login prompt. Board can drop into single user mode, no problem. But
> it should be all by itself. Which is the way to go?

A few options :

- edit /etc/init.d/rcS and run the program you wish.
- edit /etc/inittab and run your application at the appropriate runlevel.

Himanshu Chauhan · External Since: Jun 19, 2006 Posts: 17

Geronimo W. Christ Esq wrote:
> Himanshu Chauhan wrote:
>> Hello all,
>>
>> I am doing an embedded project based on the AT91RM9200 board. I am using
>> 2.6.22 vanilla kernel with patches from maxim. Till now the system boots
>> fine and init loads the sulogin followed by busy box shell, after
>> booting. I have a program. That is the only program that will ever run
>> on the board. How can start that automatically after init. I don't want
>> any login prompt. Board can drop into single user mode, no problem. But
>> it should be all by itself. Which is the way to go?
>
> A few options :
>
> - edit /etc/init.d/rcS and run the program you wish.
> - edit /etc/inittab and run your application at the appropriate runlevel.

Before posting here I had already tried the above initab thing. Didn't
work. For some reasons busybox's sulogin was being run. Sorry didn't
reply to any of the earlier posts, because all other posts were
preaching. I am used to usenet now. I understand when to post and I also
understand 10% people will try to preach. You can avoid them Smile

Anyways,
replacing sulogin didn't seem to work. I will have to figure out why it
happens. Because I had a similar problem. The tftp program in busybox
wasn't good enough. So I wrote a small tftp program and am using it now.
I copied that in /usr/local/bin where the symlink to tftp of busybox was
lysing in the board. But still when I simply type tftp the busybox's
tftp starts. To run my binary I have to give full path.

--Himanshu