EBC Exercise 08 Installing Development Tools 3.8

Early in the class most of the exercises we will do will all run on the BeagleBoard. You'll be able to edit (gedit), compile (gcc) and run all on the Beagle. Later, when we start compiling the kernel or the boot loader, (U-boot) you will need to cross compile on a Linux machine and copy the results to the Beagle.

The purpose of this exercise is to install all the tools needed for compiling on your host so they will be ready when you need them.

Instructions for building Ångström are given here; however there are a few changes you have to make. Here's what I did.

Tip: Run this exercise using a wired connection if you can. The Ubuntu wireless driver can be finicky, and if it stops working you'll have to restart some of this.

The Kernel
These instructions have been tested for the 3.2.25 kernel.

download
These are notes are based on Beagleboard kernel git site.

First download the tools needed to compile the kernel. This took about 25 seconds. host$ sudo apt-get install -y git lzop gcc-arm-linux-gnueabi uboot-mkimage

Next download the tools to get the kernel and the patches needed to make it run on the beagle. (2.5 seconds) host$ cd ~/BeagleBoard host$ git clone git://github.com/beagleboard/kernel.git

Next download the kernel and the patches. Before running ./patch/sh, take a look at it. Can you figure out what it's doing? Also look at patch_script.sh, it's where the details are. The downloading/patching process takes some 39 minutes. host$ gedit patch.sh patch_script.sh host$ ./patch.sh

compile
Once patched you are ready to compile the kernel. The first time takes a while. Mine tool 4 minutes, but I was running on 8 cores. Set the -jX  to match the number of cores you have. uImage is the kernel! host$ export ARCH=arm host$ export CROSS_COMPILE=arm-linux-gnueabi- host$ make -j9 host$ make uImage

You also need all the kernel modules. Here we create a directory to install them in. (a few seconds) host$ mkdir rootfs host$ make INSTALL_MOD_PATH=rootfs modules_install

install
Copy the kernel and the modules to the Beagle. (a minute or so) host$ '''scp kernel/arch/arm/boot/uImage root@beagle:/boot/uImage-3.2.25+ host$ cd rootfs host$ find -H -depth | cpio -o -H crc | ssh root@beagle 'cd /; cpio -id' 

Now log into the beagle and move some things around. host$ '''ssh root@beagle beagle$ cd /boot beagle$ rm uImage beagle$ ln -s uImage-3.2.25+ uImage beagle$ mkdir /media/mmcblk0p1 beagle$ mount /dev/mmcblk0p1 /media/mmcblk0p1 beagle$ cp /boot/uImage-3.2.25+ /media/uImage

DAS U-boot
These instructions came from eewiki.

download
While were' at it, let's get the boot loader we'll be using. It takes some 3 minutes.

host$ cd ~/BeagleBoard host$ git clone git://git.denx.de/u-boot.git host$ cd u-boot/ host$ git checkout v2012.10-rc2 -b tmp

compile
Now configure and build. The first time takes some 4 minutes. After that it's only 5 seconds or so. (Replace am335x_evm_config with omap3_beagle_config if you are compiling for the xM.) host$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- am335x_evm_config host$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-

install
host$ scp u-boot.img root@beagle:. beagle$ mkdir /media/mmcblk0p1 beagle$ mount /dev/mmcblk0p1 /media/mmcblk0p1 beagle$ cd /media/mmcblk0p1 beagle$ mv u-boot.img u-boot.img.orig # Save the working u-boot beagle$ cp ~/u-boot.img u-boot.img.new beagle$ cp u-boot.img.new u-boot.img Once installed you are ready for u-boot work.