Sunday, March 20, 2011
Only required files on boot partition are uImage, u-boot.img, and MLO. I proved this to myself by removing the other files and successfully booting the 2.6.32 kernel.
Process for building:
bitbake virtual/kernel -c [clean -> configure -> compile -> deploy]
(in the above, -> means "followed by").
2.6.29 and 2.6.31 both seem to brick the device after uncompress of uImage file. No further output in minicom, LEDs D6 and D7 stay solid on (typically, during boot, you will see them flashing somewhat randomly). I'm bummed about not being able to boot either of these (at this point at least) since these kernel versions have RT linux kernel patches available for them.
2.6.32 boots no problem into a command prompt.
2.6.37 looks ok, mostly -- LEDs D6 and D7 flash, but no minicom output. I plugged in an ethernet cable and was able to SSH into the device, so it booted. Perhaps the tty configured for the kernel is bogus? Some searching turns up the following:
I'm not sure why the kernel version built by bitbake is coupled to the kernel version of the host. Seems like they should be separate.
I posted about this here. A response came in several hours later (which you can read by clicking the link). After making the changes that were suggested, I did:
bitbake virtual/kernel -c clean
bitbake virtual/kernel -c configure
bitbake virtual/kernel -c compile
Was able to get a 2.6.29 uImage file after following the above steps. Next step is to test it.
Thursday, March 17, 2011
Wednesday, March 16, 2011
The defconfig is stored in
What I usually do is:
1) bitbake virtual/kernel -c configure
2) cd tmp/work/foo/bar/git ; make menuconfig
(in my case, appears to be ~/beagleboard/angstromtoolchain/setup-scripts/build/tmp-angstrom_2008_1/work/beagleboard-angstrom-linux-gnueabi/linux-omap-psp-2.6.32-r100+gitr5fc29e7b2a76a64a739f857858ef0b98294aa155/git$ make menuconfig)
3) cp .config
4) bitbake bitbake virtual/kernel -c compile -f ; bitbake virtual/kernel -c
5) goto 2)
$ bitbake -c compile -f virtual/kernel
Tuesday, March 15, 2011
Here are some useful links.
Configuring OE kernel/Angstrom
Building Angstrom for Beagleboard
Simplified development setup | The Ångström Distribution
RT Preempt patch: