EBC Exercise 27 BusyBox

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Revision as of 07:44, 2 January 2012 by Yoder (Talk | contribs) (Configuring BusyBox)

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Compiling BusyBox

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

# INHERIT += " rm_work "

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:

host$ source  ~/.oe/environment-oecore
host$ time bitbake busybox
host$ cd ~/BeagleBoard/oe/build/tmp-angstrom_2010_x-eglibc/work/beagleboard-angstrom-linux-gnueabi
host$ ls

My bitbake took about 1.5 minutes to download and compile.

When you did ls did you see BusyBox? I didn't. Do this to find it:

host$ cd cd ~/BeagleBoard/oe/build/tmp-angstrom_2010_x-eglibc/work
host$ find . -name "*busybox*"

The find command will find all files and directories that contain the name busybox. 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

You can now configure BusyBox.

host$ ~/.oe/crossCompileEnv.sh
host$ make xconfig

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

host$ make

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

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...

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.

URL Name Notes
mr814.dhcp.rose-hulman.edu Mark A. Yoder My first Beagle web page.

Shrinking 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.