Difference between revisions of "EBC Exercise 25 Configuring U-boot"
m (moved ECE597 Configuring U-boot to ECE497 Configuring U-boot) |
m (moved ECE497 Configuring U-boot to ECE497 Lab07 Configuring U-boot) |
(No difference)
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Revision as of 11:58, 23 March 2011
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 u-boot-
. 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 INHERIT += " rm_work "
and comment it out.
# INHERIT += " rm_work "
Save the file and then:
cd ${OETREE}/openembedded $ bitbake -c clean u-boot $ bitbake -f -c compile u-boot
- 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 make
should compile U-boot.
Assignment: Modify u-boot to include your initials in the prompt.
Hint: Look for the omap3_beagle.h file.