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Kernel Preparation

Install dependencies

sudo apt-get install u-boot-tools g++-arm-linux-gnueabi

Download the kernel

cd overo
mkdir kernel-dev
cd kernel-dev
git clone git://github.com/gumstix/linux.git linux
cd linux
git checkout omap-3.5

The default configuration can be found on gumstix's github page: https://github.com/gumstix/Gumstix-YoctoProject-Repo/wiki.  Copy the file and rename it as ".config" in ~/overo/kernel-dev/linux

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- menuconfig

Current modifications:

  • disable touchscreen input in driver -> input device support
  • disable all of driver -> graphics support

Build the kernel and modules

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- uImage -j2
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- modules -j2

The resulting uImage should be built in arch/arm/boot.  Modules will be installed by the script that makes the SD card.  

UBoot

Get the omap-v2014.10 u-boot branch from gumstix github.  

cd ~/overo
mkdir uboot-dev
cd uboot-dev
git clone git://github.com/gumstix/u-boot.git u-boot
cd u-boot
git checkout omap-v2014.10

To change the pin mux, modify overo.h in board/overo.  The build:

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- omap3_overo_config
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- all -j4

Both MLO and u-boot will be built in the top u-boot directory.

Rootfs

The package firmware-libertas is required from wheezy backports.  Add the following lines to /etc/apt/sources.list.d/multistrap-wheezy.list in the rootfs.  

deb [arch=armel] http://mv.ezproxy.com.ezproxyberklee.flo.org/debian wheezy-backports non-free
deb-src http://mv.ezproxy.com.ezproxyberklee.flo.org/debian wheezy-backports non-free

Then install the package:

apt-get update
apt-get install firmware-libertas

libnl
libnl-3-dev
libnl-genl-3-dev
libssldev 

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