Automatically launch your application - Revision history

JulienB at 18:16, 17 April 2013

2013-04-17T18:16:00Z

JulienB: /* Adding your own application in the start process */

2013-04-17T15:00:14Z

‎Adding your own application in the start process

JulienB: /* System startup */

2013-04-17T14:50:51Z

‎System startup

JulienB at 14:46, 17 April 2013

2013-04-17T14:46:52Z

JulienB: /* Adding your own app in the start process */

2011-02-22T10:04:29Z

‎Adding your own app in the start process

JulienB: creation

2009-04-10T07:28:33Z

creation

New page

You've just developed a state of the art application and want it to be launched each time you boot your APF ? Then this small tutorial is for you !

==System startup==
First, a small remainder: when you start your board, here is how all things are started:
# U-Boot initializes the system and load Linux
# Linux mounts its rootfs and launches ''/sbin/init''
# ''init'' process checks its ''/etc/inittab'' config file and executes the instructions it contains
# this config files generally asks ''init'' to launch ''/etc/init.d/rcS''
# ''/etc/init.d/rcS'' gets all scripts in ''/etc/init.d/'' directory which start with a '''S''', and executes them in ascending order

==Adding your own app in the start process==
* creates a shell script in ''/etc/init.d/'':
<pre class="apf">
# touch /etc/init.d/S99app
# chmod a+x /etc/init.d/S99app
</pre>
* edit it
<pre class="apf">
# vi /etc/init.d/S99app
</pre>
* put in it the following content (replace ''/usr/bin/your_app'' with your application name & path):

<source lang="bash">
#!/bin/sh

/usr/bin/your_app &

exit 0
</source>
* save your changes and that's it !

==Links==
* [[Linux_Boot_Logo| How to customize your boot Logo]]

@@ Line 10: / Line 10: @@
 # ''/etc/init.d/rcS'' look at all scripts in ''/etc/init.d/'' directory which start with a '''S''', and executes them in ascending order
-==Adding your own application in the ssystem start process==
+==Adding your own application in the system start process==
 * creates a shell script in ''/etc/init.d/'':
 <pre class="apf">
@@ Line 42: / Line 42: @@
 # sync
 # reboot
 </pre>

@@ Line 10: / Line 10: @@
 # ''/etc/init.d/rcS'' look at all scripts in ''/etc/init.d/'' directory which start with a '''S''', and executes them in ascending order
-==Adding your own application in the start process==
+==Adding your own application in the ssystem start process==
 * creates a shell script in ''/etc/init.d/'':
 <pre class="apf">

← Older revision		Revision as of 14:46, 17 April 2013
Line 45:		Line 45:
	==Links==		==Links==
	* [[Linux_Boot_Logo\| How to customize your boot Logo]]		* [[Linux_Boot_Logo\| How to customize your boot Logo]]
		+
		+	[[Category:Startup]]

@@ Line 3: / Line 3: @@
 ==System startup==
 First, a small remainder: when you start your board, here is how all things are started:
-# U-Boot initializes the system and load Linux
+# U-Boot initializes the processor, vital peripherals and then load Linux image from Flash,
-# Linux mounts its rootfs and launches ''/sbin/init''
+# U-Boot starts Linux image by passing it some parameters, the ''bootargs'',
-# ''init'' process checks its ''/etc/inittab'' config file and executes the instructions it contains
+# Linux starts, mounts its rootfs and launches ''/sbin/init'',
-# this config files generally asks ''init'' to launch ''/etc/init.d/rcS''
+# ''init'' process checks its ''/etc/inittab'' config file and executes the instructions it contains,
-# ''/etc/init.d/rcS'' gets all scripts in ''/etc/init.d/'' directory which start with a '''S''', and executes them in ascending order
+# this config file generally asks ''init'' to launch ''/etc/init.d/rcS'' at some point,
 ==Adding your own application in the start process==

@@ Line 9: / Line 9: @@
 # ''/etc/init.d/rcS'' gets all scripts in ''/etc/init.d/'' directory which start with a '''S''', and executes them in ascending order
-==Adding your own app in the start process==
+==Adding your own application in the start process==
 * creates a shell script in ''/etc/init.d/'':
 <pre class="apf">
@@ Line 24: / Line 24: @@
 #!/bin/sh
-/usr/bin/your_app &
+# Loading the modules needed by my app:
 exit 0
 </source>
-* save your changes and that's it !
+* save your changes and '''!! Test it !!'''
 ==Links==
 * [[Linux_Boot_Logo| How to customize your boot Logo]]