EBC Exercise 25 Configuring U-boot

This follows the approach taken in ECE597 Configuring the Kernel. We'll use bitbake to get the source files for U-boot and then we'll edit them.

bitbake
When you did ECE597 Installing The Ångström Distribution you used bitbake to build console-image. During that build the kernel was downloaded and compiled. If you used the default configure, the source code was removed once it was done. Check and see: $ cd ${OETREE}/angstrom-dev/work/beagleboard-angstrom-linux-gnueabi $ ls You should see a directory starting with. The rest of the name tells what version you have. Change to that directory and see what's there: $ cd u-boot-* $ ls If you see a git directory, you are in luck. If you see just a temp directory you need to do the following to reload the sources: $ cd ${OETREE}/build/conf $ gedit local.conf Find the line near the top that says  and comment it out. Save the file and then: cd ${OETREE}/openembedded $ bitbake -c clean u-boot $ bitbake -f -c compile u-boot
 * 1) INHERIT += " rm_work "
 * The first bitbake command tells bitbake to remove the previously made binary file for that package (think "make clean"), which will force it to re-do what it previously did with the console-image build.
 * The second bitbake line forces bitbake to rebuild the u-boot package, which will require re-extracting the previously deleted source code, and apply the relevant OE related patches.

This took 4 minutes on my machine.

Once done go back to $ cd ${OETREE}/angstrom-dev/work/beagleboard-angstrom-linux-gnueabi/u-boot-* $ ls You should now see the git directory. cd to it and look around.

Compiling U-boot
You can now compile U-boot. Make the following file called source-me.txt. export OETREE="${HOME}/oe" export ARCH=arm export CROSS_COMPILE=arm-angstrom-linux-gnueabi-

PATH=${OETREE}/angstrom-dev/staging/i686-linux/usr/bin/:${PATH} PATH=${OETREE}/angstrom-dev/cross/armv7a/bin/:${PATH} Save the file and enter: $ source source-me.txt Now a simple  should compile U-boot.

Assignment: Modify u-boot to include your initials in the prompt.

Hint: Look for the omap3_beagle.h file.