Add Gnublin board support with fixed kernel header version

This the Buildroot support for the LPC3131 based Gnublin board (see here:

http://en.gnublin.org/) and to the Elektor Linux board

(http://www.elektor.com/news/elektor-presents-embedded-linux-made-easy.2147294.

lynkx)

Unfortunately currently the AD and the pwm modules are not supported, i'm about

to add also those drivers as well to the current kernel later.

Base kernel version: 3.7 (available here:

https://gitorious.org/linux-3-7-gnublin/linux-3-7-gnublin/commits/gnublin-

support)

U-boot version: 2009.11 (available here:

https://gitorious.org/u-boot-gnublin-support/u-boot-gnublin-support)

Steps to create a bootable SD card (with the given config you need an at least

500 MB SD card):

1.Config buildroot with the gnublin_defconfig:

$ make gnublin_defconfig

2.Tweak the config for your needs:

$ make menuconfig

3.Build:

$ make

4.Create two partitions on your SD card, one with type of BootIt (fdisk ID: df),

the size should be around 1M, and another partition with all of the left space

on the card, and with the type of normal DOS partition.

5.From the output/images directory dump the u-boot image to the BootIt partition

(probably you have to modify the output /dev files according to your system):

$ dd if=output/images/u-boot.bin of=/dev/sdc1

6.Dump the root fs image as well:

$ dd if=output/images/rootfs.ext2 of=/dev/sdc2

7.Insert the SD card into the board's slot, and your board should boot up with

your newly created system.

Any feedback/report is welcome on the mr.zoltan.gyarmati[at]gmail.com

# Architecture

BR2_arm=y

BR2_arm926t=y

# System

BR2_KERNEL_HEADERS_VERSION=y

BR2_DEFAULT_KERNEL_VERSION="3.7"

BR2_TARGET_GENERIC_ISSUE="Welcome to Gnublin"

# Filesystem

BR2_TARGET_ROOTFS_EXT2=y

BR2_TARGET_ROOTFS_EXT2_BLOCKS=475000

# Bootloader

BR2_TARGET_UBOOT=y

BR2_TARGET_UBOOT_BOARDNAME="GNUBLIN"

BR2_TARGET_UBOOT_CUSTOM_GIT=y

BR2_TARGET_UBOOT_CUSTOM_GIT_REPO_URL="git://gitorious.org/u-boot-gnublin-support/u-boot-gnublin-support.git"

BR2_TARGET_UBOOT_CUSTOM_GIT_VERSION="2009.11_gnublin_support_v2"

# Kernel

BR2_LINUX_KERNEL=y

BR2_LINUX_KERNEL_CUSTOM_GIT=y

BR2_LINUX_KERNEL_CUSTOM_GIT_REPO_URL="git://gitorious.org/linux-3-7-gnublin/linux-3-7-gnublin.git"

BR2_LINUX_KERNEL_CUSTOM_GIT_VERSION="v3.7-gnublin-2"

BR2_LINUX_KERNEL_DEFCONFIG="gnublin"

BR2_LINUX_KERNEL_INSTALL_TARGET=y