How to boot Linux on Pandaboard

四月 11, 2013

Better display @ http://tek-life.github.io/blog/how-to-boot-linux-on-pandaboard/

Pandaboard Specification

CPU:OMAP4460 ES1.1
Board: OMAP4 Panda rev B2
DRAM: 1 GiB

Detailed information about Pandaboard could be found here.

Serial Port Settings

BAUD RATE: 115200
DATA: 8bit
PARITY: none
STOP: 1bit
FLOW CONTROL: none

Preparation of SD card

For pandaboard, SD Card should have 2 partitions at least: one for the boot and one for the rootfs. A script below could make partitions for SD Card.

$wget http://git.openembedded.org/openembedded/plain/contrib/angstrom/omap3-mkcard.sh

$chmod 777 omap3-mkcard.sh

$./omap3-mkcard.sh /dev/sdb

After running the script, then mount the SD card partitions on host to verify:

$mkdir /tmp/mmc1

$mkdir /tmp/mmc2

$sudo mount /dev/sdb1 /tmp/mmc1

$sudo mount /dev/sdb2 /tmp/mmc2

Preparation for UBoot

$git clone  git://git.denx.de/u-boot.git

$git checkout -b v2013.4 v2013.4  <set ARCH and CROSS_COMPILE environment variables>

$make omap4_panda_config

$make

That will generate the following files:

MLO  u-boot.img  u-boot.bin

MLO is the x-loader binary with a header containing the memory location to load the file to and the size of the file.
u-boot.img is exactly the same as u-boot.bin, but a u-boot header has been appended (using mkimage). Nowadays , with current version of u-boot it is expected to use u-boot.img, as this filename is hardcoded in the initial bootloader (MLO).
So now you can copy the 2 files (MLO and u-boot.img) onto the SD boot partition.

$cp MLO u-boot.img /media/boot

Linaro is also maintaining its own stable version of u-boot which is being used for Linaro and Canonical releases. The git tree is located here.
More information about uboot could be found here.

Preparation for Linux Kernel

$git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git  
$git checkout -b v3.4 v3.4  
$make omap2plus_defconfig  
$make uImage

The default omap2plus_defconfig is the kernel configuration that works on any OMAP2+ boards. There are default settings, that you might want to change. For example, you can enable USB EHCI and that will bring support for the USB host on the Panda. Of course there are tons of other settings that you can change.

$cp arch/arm/boot/uImage /media/boot

Preparation for File System

Get file system from below URL.

http://cdimage.ubuntu.com/ubuntu-core/releases/12.04/release/ubuntu-core-12.04.1-core-armhf.tar.gz

Untar the filesystem onto the SDCard:

$cd /media/rootfs  
$sudo tar --numeric-owner ubuntu-core-12.04.1-core-armhf.tar.gz

Boot script for uBoot

Create the boot script file boot.script with the following content:

fatload mmc 0:1 0x80000000 uImage  
setenv bootargs rw vram=32M fixrtc mem=1G@0x80000000 root=/dev/mmcblk0p2 console=ttyO2,115200n8 rootwait  
bootm 0x80000000

Generate the boot.scr file:

mkimage -A arm -T script -C none -n "Boot Image" -d boot.script boot.scr

Copy the boot.scr to SD card boot partition.

cp boot.scr /media/boot

NOTE: the boot.scr is not necessary, you could input this script to uBoot shell by hand.
Now, everything is ok. It't time to plug in the SD card to pandaboard.

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