Compile U-Boot, MLO and Kernel

This document covers the general use of U-Boot v2012.10 and the AMSDK on the following platforms:

am335x EVM am335x EVM-SK Pengwyn

Before starting to build the projects open a terminal (ctrl + alt + t) and go to the root folder of the SDK Sitara:

cd ti-sdk-am335x-evm-05.06.00.00

Type “cd ti-”, and press the “tab” key for autocompletion. Create a folder to copy once completed system images.:

cd board-support

In this folder you will find the projects that we’re going to compile.:

mkdir built-images

This folder will be used as destination for the built images.

Build U-Boot & MLO

Now go into the project U-Boot:

cd u-boot-2012.10-psp05.06.00.00

As TI is suggesting, we, as well, recommend keeping the object files separated when building. You can do this using the following option parameter when invoking the make command:

O = object-directory

Where “object-directory” is the name of a folder you created for this purpose with:

mkdir object-directory

You can now compile the bootloader with the following commands:

rm -rf ./object-directory
export PATH="/home/pengwyn/ti-sdk-am335x-evm-05.06.00.00/linux-devkit/bin:$PATH"
make O=object-directory CROSS_COMPILE=arm-arago-linux-gnueabi- ARCH=arm pengwyn

When the compilation ends you will find the bootloader files in the directory of the object files:

• u-boot.img
• MLO

Copy these files to built-images folder:

cp MLO ../../built-images
cp u-boot.img ../../built-images

Build the Kernel

From ti-sdk-am335x-evm-05.06.00.00 directory, go to the folder for the development of the operating system:

cd board-support

In this folder there are the projects t we’re going to compile. Now go into the Kernel:

cd linux-3.2.0-psp05.06.00.08
export PATH="/home/pengwyn/ti-sdk-am335x-evm-05.06.00.00/linux-devkit/bin:$PATH"
make ARCH=arm CROSS_COMPILE=arm-arago-linux-gnueabi- uImage

When compilation finish do:

cd arch/arm/boot

There you will find the compiled kernel “uImage”, copy it to the folder you created previously (built-images):

cp uImage /home/pengwyn/ti-sdk-am335x-evm-05.06.00.00/board-support/built-images

You do not need to copy the driver modules to the file system because the compiled kernel already includes them.