Draneaw at 05:29, 8 November 2012

2012-11-08T05:29:01Z

Yoder: /* Finding the kernel sources */

2012-10-29T19:43:57Z

‎Finding the kernel sources

Yoder: Bitbake version

2012-10-29T19:43:04Z

Bitbake version

New page

[[Category:ECE497]]
[[Category:BeagleBoard]]
{{YoderHead}}

This is the '''bitbake''' version.

In a previous exercise ([[EBC Exercise 22 Cross-Compiling and Finding the Right Kernel - bitbkae]]) you learned how to get and compile the kernel. Here we'll look at configuring it.

== Finding the kernel sources ==

First set up the environment and go to the kernel directory

host$ '''source ~/.oe/crossCompileEnv.sh'''
host$ '''cd ~/BeagleBoard/oe/build/tmp-angstrom_v2012_05-eglibc/work/beagleboard-angstrom-linux-gnueabi/linux-omap-psp-2.6.32-r121c+gitr5fc29e7b2a76a64a739f857858ef0b98294aa155/git/'''

We'll be visiting this directory so often you should set up an alias:
host$ '''alias kernel="cd ~/BeagleBoard/oe/build/tmp-angstrom_v2012_05-eglibc/work/beagleboard-angstrom-linux-gnueabi/linux-omap-psp-2.6.32-r121c+gitr5fc29e7b2a76a64a739f857858ef0b98294aa155/git/"'''

Then just entering
host$ '''kernel'''
will take you to the kernel directory. Put the alias in your '''~/.bashrc''' file so it will be there every time you log in.

== Getting kernel make help ==
Once there try some of the make commands. Help is a good place to start.

host$ '''make help | less'''
Cleaning targets:
clean - Remove most generated files but keep the config and
enough build support to build external modules
mrproper - Remove all generated files + config + various backup files
distclean - mrproper + remove editor backup and patch files

Configuration targets:
config - Update current config utilising a line-oriented program
menuconfig - Update current config utilising a menu based program
xconfig - Update current config utilising a QT based front-end
gconfig - Update current config utilising a GTK based front-end
...
This produces a list of common make targets.

== Finding and installing support software ==

There are several ways to configure the kernel. '''make config''' will prompt you line-by-line for each of the settings, very tedious, not recommended. Try

host$ '''make menuconfig'''
*** Unable to find the ncurses libraries or the
*** required header files.
*** 'make menuconfig' requires the ncurses libraries.
***
*** Install ncurses (ncurses-devel) and try again.
***
make[1]: *** [scripts/kconfig/dochecklxdialog] Error 1
make: *** [menuconfig] Error 2
If you get the error above, you need to install the ncurses library. [[ECE497_Tips_and_Tricks#On_the_host | Here]] are notes on how to discover what to install and installing it.

NOTE FOR UBUNTU USERS: 'sudo apt-get install libncurses5-dev' without quotes will install ncurses

== Configuring the kernel ==

Try the various interfaces for configuring the kernel.

host$ '''make menuconfig'''
host$ '''make xconfig'''
host$ '''make gconfig'''

I had to run the following to get these to work.
host$ '''sudo apt-get install libncurses5-dev'''
host$ '''sudo apt-get install qt3-dev-tools'''
host$ '''sudo apt-get install libglade2-dev'''

{{YoderFoot}}

@@ Line 5: / Line 5: @@
 This is the '''bitbake''' version.
-In a previous exercise ([[EBC Exercise 22 Cross-Compiling and Finding the Right Kernel - bitbkae]]) you learned how to get and compile the kernel.  Here we'll look at configuring it.
+In a previous exercise ([[EBC Exercise 22 Cross-Compiling and Finding the Right Kernel - bitbake]]) you learned how to get and compile the kernel.  Here we'll look at configuring it.
 == Finding the kernel sources ==

@@ Line 11: / Line 11: @@
 First set up the environment and go to the kernel directory
-  host$ '''source ~/.oe/crossCompileEnv.sh'''
+  host$ '''source ~/.oe/crossCompileEnvBitbake.sh'''
   host$ '''cd ~/BeagleBoard/oe/build/tmp-angstrom_v2012_05-eglibc/work/beagleboard-angstrom-linux-gnueabi/linux-omap-psp-2.6.32-r121c+gitr5fc29e7b2a76a64a739f857858ef0b98294aa155/git/'''

EBC Exercise 23 Configuring the Kernel - bitbake - Revision history

Draneaw at 05:29, 8 November 2012

Yoder: /* Finding the kernel sources */

Yoder: Bitbake version