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Difference between revisions of "EBC Exercise 27 BusyBox"

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== Compiling BusyBox ==
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== Getting BusyBox ==
 +
=== downloading ===
  
We'll attack getting BusyBox like we did getting the kernel ([[EBC Exercise 01 Using bitbake for Kernel and U-boot]]) though the paths will be slightly different.  Make sure you have commented out
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Get the busybox sources from the busybox site
<pre>
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# INHERIT += " rm_work "
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</pre>
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in the '''local.conf''' file.  See [[EBC Exercise 01 Using bitbake for Kernel and U-boot]] for details.
+
  
Check and see what you already have for previous installations:
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host$ '''git clone git://busybox.net/busybox.git'''
 +
host$ '''cd busybox'''
  
  host$ '''source ~/.oe/environment-oecore'''
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=== compiling ===
  host$ '''time bitbake busybox'''
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  host$ '''source ~/.oe/crossCompileEnv.sh'''
  host$ '''cd ~/BeagleBoard/oe/build/tmp-angstrom_2010_x-eglibc/work/beagleboard-angstrom-linux-gnueabi'''
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  host$ '''make help'''
  host$ '''ls'''
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  host$ '''make defconfig'''
 +
  host$ '''make -j9'''       # use -j''X'' for ''X-1'' cores
  
My bitbake took about 1.5 minutes to download and compile.
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=== configuring ===
  
When you did ''ls'' did you see '''BusyBox'''?  I didn't. Do this to find it:
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You can now configure BusyBox (In the event that none of the graphical tools work you can use "make config" to use the text based tool as a method of last resort).
  
  host$ '''cd cd ~/BeagleBoard/oe/build/tmp-angstrom_2010_x-eglibc/work'''
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  host$ '''make gconfig'''
host$ '''find . -name "*busybox*"'''
+
  
The ''find'' command will find all files and directories that contain the name <code>busybox</code>.
+
After saving the configuration changes to update the .config file, it is a simple matter of running make.  
BusyBox is not a Beagle specific compile, so it appears in a different location.  Change to the BusyBox directory and look around.  Can you find the source? Hint: they aren't in a git directory.
+
  
== Configuring BusyBox ==
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  host$ '''make -j9'''
 
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You can now configure BusyBox.
+
 
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host$ '''~/.oe/crossCompileEnv.sh'''
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host$ '''make xconfig'''
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After saving the configuration changes to update the .config file, it is a simple matter of running make.
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+
  host$ '''make'''
+
  
 
My make took about 1.5 minutes to compile (25 seconds with make -j8!).
 
My make took about 1.5 minutes to compile (25 seconds with make -j8!).
  
 +
=== installing ===
 
Copy it to your Beagle and test it out.  Just typing '''busybox''' will tell you what commands it knows.  Try some of them.
 
Copy it to your Beagle and test it out.  Just typing '''busybox''' will tell you what commands it knows.  Try some of them.
 
  host$ '''scp busybox root@beagle:.'''
 
  host$ '''scp busybox root@beagle:.'''
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Try some other commands...
 
Try some other commands...
  
== Shrinking BusyBox ==
+
== Playing with BusyBox ==
  
How big is the '''busybox''' file?  Try making it smaller by removing commands you don't use.  How big is it if you just have ''ls''? How much bigger is it when you add httpd?  Try your own combinations.  Report your findings to the class.
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=== shrinking ===
  
== Static Linking ==
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How big is the '''busybox''' file?  The default configuration for busybox has it many things (some 400).  Reconfigure it to do just the commands you use.  How big is it now? How big is it if you just have ''ls''? How much bigger is it when you add httpd?  Try your own combinations.  Report your findings in your status report.
  
Some embedded systems are so small they don't have shared libraries.  Recompile busybox to be statically linked.  How big it is?  Does it still work?
+
=== Static Linking ===
  
== Running a Web Server ==
+
Some embedded systems are so small they don't have shared libraries.  Recompile busybox to be statically linked. (Hint: look in configuration) How big it is?  Does it still work?
  
Configure busybox to be a web server. Look under '''Networking Untilites''', select '''httpd'''.  How much more space does it take?
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=== Running a Web Server ===
  
beagle$ '''busybox httpd'''
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Configure busybox to be a web server. Look under '''Networking Utilites''', select '''httpd'''.  How much more space does it take?
  
Yup, you are now running a web server. Your task is to figure out where to put the web pages it is serving.  If you get something interesting going post your Beagle's address here. Hint: find httpd.c.
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  beagle$ '''busybox httpd'''
  
{|style="color:green; background-color:#ccccff;" cellpadding="10" cellspacing="0" border="1"
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Yup, you are now running a web server. Your task is to figure out where to put the web pages it is serving. If you get something interesting going, post your Beagle's address here. Hint: find httpd.c.
! URL !! Name !! Notes
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|-
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| [http://137.112.41.87/test.html 137.112.41.87/test.html]
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| Mark A. Yoder
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| My first Beagle web page.
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|}
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Revision as of 05:26, 8 November 2012

thumb‎ Embedded Linux Class by Mark A. Yoder


Getting BusyBox

downloading

Get the busybox sources from the busybox site

host$ git clone git://busybox.net/busybox.git
host$ cd busybox

compiling

host$ source ~/.oe/crossCompileEnv.sh
host$ make help
host$ make defconfig
host$ make -j9       # use -jX for X-1 cores

configuring

You can now configure BusyBox (In the event that none of the graphical tools work you can use "make config" to use the text based tool as a method of last resort).

host$ make gconfig

After saving the configuration changes to update the .config file, it is a simple matter of running make.

host$ make -j9

My make took about 1.5 minutes to compile (25 seconds with make -j8!).

installing

Copy it to your Beagle and test it out. Just typing busybox will tell you what commands it knows. Try some of them.

host$ scp busybox root@beagle:.
beagle$ busybox
beagle$ busybox ls

Try some other commands...

Playing with BusyBox

shrinking

How big is the busybox file? The default configuration for busybox has it many things (some 400). Reconfigure it to do just the commands you use. How big is it now? How big is it if you just have ls? How much bigger is it when you add httpd? Try your own combinations. Report your findings in your status report.

Static Linking

Some embedded systems are so small they don't have shared libraries. Recompile busybox to be statically linked. (Hint: look in configuration) How big it is? Does it still work?

Running a Web Server

Configure busybox to be a web server. Look under Networking Utilites, select httpd. How much more space does it take?

beagle$ busybox httpd

Yup, you are now running a web server. Your task is to figure out where to put the web pages it is serving. If you get something interesting going, post your Beagle's address here. Hint: find httpd.c.




thumb‎ Embedded Linux Class by Mark A. Yoder