config: Add defconfig for Freescale i.MX28 EVK

#!/bin/sh

set -u

set -e

PROGNAME=$(basename $0)

usage()

{

    echo "Create an SD card that boots on an i.MX28 EVK board."

    echo

    echo "Note: all data on the the card will be completely deleted!"

    echo "Use with care!"

    echo "Superuser permissions may be required to write to the device."

    echo

    echo "Usage: ${PROGNAME} <sd_block_device>"

    echo "Arguments:"

    echo "  <sd_block_device>     The device to be written to"

    echo

    echo "Example: ${PROGNAME} /dev/mmcblk0"

    echo

}

if [ $# -ne 1 ]; then

    usage

    exit 1

fi

if [ $(id -u) -ne 0 ]; then

    echo "${PROGNAME} must be run as root"

    exit 1

fi

DEV=${1}

# The partition name prefix depends on the device name:

# - /dev/sde -> /dev/sde1

# - /dev/mmcblk0 -> /dev/mmcblk0p1

if echo ${DEV}|grep -q mmcblk ; then

    PART="p"

else

    PART=""

fi

PART1=${DEV}${PART}1

PART2=${DEV}${PART}2

PART3=${DEV}${PART}3

# Unmount the partitions if mounted

umount ${PART1} || true

umount ${PART2} || true

umount ${PART3} || true

# First, clear the card

dd if=/dev/zero of=${DEV} bs=1M count=20

sync

# Partition the card.

# SD layout for i.MX28 boot:

# - Special partition type 53 at sector 2048, containing an SD-SB-encapsulated u-boot

# - FAT partition containing zImage

# - ext2/3 partition formatted as ext2 or ext3, containing the root filesystem.

sfdisk --force -u S ${DEV} <<EOF

2048,2000,53

4048,16000,b

20048,,L

EOF

sync

# Copy the bootloader at offset 2048

# (We need to skip the partition table in the .sd, too.)

dd if=output/images/u-boot.sd of=${DEV}1 bs=1M

# Prepare a temp dir for mounting partitions

TMPDIR=$(mktemp -d)

# FAT partition: kernel

mkfs.vfat ${PART2}

mount ${PART2} ${TMPDIR}

cp output/images/*Image ${TMPDIR}/

cp output/images/*.dtb  ${TMPDIR}/ || true

sync

umount ${TMPDIR}

# ext2 partition: root filesystem

mkfs.ext2 ${PART3}

mount ${PART3} ${TMPDIR}

tar -C ${TMPDIR}/ -xf output/images/rootfs.tar

sync

umount ${TMPDIR}

# Cleanup

rmdir ${TMPDIR}

sync

echo Done

**************************

Freescale i.MX28 EVK board

**************************

This file documents the Buildroot support for the Freescale i.MX28 EVK board.

Read the i.MX28 Evaluation Kit Quick Start Guide [1] for an introduction to the

board.

Build

=====

First, configure Buildroot for your i.MX28 EVK board:

  make freescale_imx28evk_defconfig

Build all components:

  make

You will find in ./output/images/ the following files:

  - imx28-evk.dtb

  - rootfs.tar

  - u-boot.sd

  - zImage

Create a bootable SD card

=========================

To determine the device associated to the SD card have a look in the

/proc/partitions file:

  cat /proc/partitions

Run the following script as root on your SD card. This will partition the card

and copy the bootloader, kernel and root filesystem as needed.

*** WARNING! The script will destroy all the card content. Use with care! ***

  ./board/freescale/imx28evk/create-boot-sd.sh <your-sd-device>

Boot the i.MX28 EVK board

=========================

To boot your newly created system (refer to the i.MX28 EVK Quick Start Guide

[1] for guidance):

- insert the SD card in the SD Card Socket 0 of the board;

- verify that your i.MX28 EVK board jumpers and switches are set as mentioned

  in the i.MX28 EVK Quick Start Guide [1];

- connect an RS232 UART cable to the Debug UART Port and connect using a

  terminal emulator at 115200 bps, 8n1;

- power on the board.

Enjoy!

References

==========

[1] http://cache.freescale.com/files/32bit/doc/user_guide/EVK_imx28_QuickStart.pdf

# architecture

BR2_arm=y

BR2_arm926t=y

# toolchain

BR2_KERNEL_HEADERS_VERSION=y

BR2_DEFAULT_KERNEL_VERSION="3.19.2"

# system

BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"

# kernel

BR2_LINUX_KERNEL=y

BR2_LINUX_KERNEL_SAME_AS_HEADERS=y

BR2_LINUX_KERNEL_DEFCONFIG="mxs"

BR2_LINUX_KERNEL_ZIMAGE=y

BR2_LINUX_KERNEL_DTS_SUPPORT=y

BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx28-evk"

# bootloader

BR2_TARGET_UBOOT=y

BR2_TARGET_UBOOT_BOARDNAME="mx28evk"

BR2_TARGET_UBOOT_CUSTOM_VERSION=y

BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2015.01"

BR2_TARGET_UBOOT_FORMAT_SD=y