2014-06-15 15:33:49 +02:00
|
|
|
Atmel SAMA5D3 Xplained board
|
|
|
|
|
============================
|
|
|
|
|
|
|
|
|
|
This document explains how to set up a basic Buildroot system on the
|
|
|
|
|
Atmel SAMA5D3 Xplained board, whose main site is
|
|
|
|
|
http://www.atmel.com/tools/ATSAMA5D3-XPLD.aspx. Additional details can
|
|
|
|
|
also be found on the http://www.at91.com/linux4sam/bin/view/Linux4SAM/
|
|
|
|
|
web site.
|
|
|
|
|
|
|
|
|
|
Note that the default Buildroot configuration is prepared to boot from
|
|
|
|
|
an SD card: the first stage bootloader, second stage bootloader,
|
|
|
|
|
kernel image and root filesystem are all located on the SD card. Some
|
|
|
|
|
adjustements in the bootloader configuration will be needed to boot
|
|
|
|
|
from NAND flash.
|
|
|
|
|
|
|
|
|
|
Configuring and building Buildroot
|
|
|
|
|
----------------------------------
|
|
|
|
|
|
|
|
|
|
make atmel_xplained_defconfig
|
|
|
|
|
make
|
|
|
|
|
|
|
|
|
|
Preparing the SD card
|
|
|
|
|
---------------------
|
|
|
|
|
|
|
|
|
|
The SD card must be partitionned with at least two partitions: one
|
|
|
|
|
FAT16 partition for the bootloaders, kernel image and Device Tree
|
|
|
|
|
blob, and one ext4 partition for the root filesystem. To partition the
|
|
|
|
|
SD card:
|
|
|
|
|
|
|
|
|
|
sudo sfdisk -uM /dev/mmcblk0 <<EOF
|
|
|
|
|
,64,6
|
|
|
|
|
;
|
|
|
|
|
EOF
|
|
|
|
|
|
|
|
|
|
This creates a 64 MB partition for the FAT16 filesystem (type 6) and
|
|
|
|
|
uses the rest for the ext4 filesystem used for the root filesystem.
|
|
|
|
|
|
|
|
|
|
Then, format both partitions:
|
|
|
|
|
|
|
|
|
|
sudo mkfs.msdos -n boot /dev/mmcblk0p1
|
|
|
|
|
sudo mkfs.ext4 -L rootfs -O ^huge_file /dev/mmcblk0p2
|
|
|
|
|
|
|
|
|
|
Note: the -O ^huge_file option is needed to avoid enabling the huge
|
|
|
|
|
files features of ext4 (to support files larges than 2 TB), which
|
|
|
|
|
needs the kernel option CONFIG_LBDAF to be enabled.
|
|
|
|
|
|
|
|
|
|
Mount both partitions (if not done automatically by your system):
|
|
|
|
|
|
|
|
|
|
sudo mount /dev/mmcblk0p1 /media/boot
|
|
|
|
|
sudo mount /dev/mmcblk0p2 /media/rootfs
|
|
|
|
|
|
|
|
|
|
Copy the bootloaders, kernel image and Device Tree blob to the first
|
|
|
|
|
partition:
|
|
|
|
|
|
2015-03-05 04:36:30 +01:00
|
|
|
cp output/images/uboot-spl.bin /media/boot/boot.bin
|
|
|
|
|
cp output/images/u-boot.img /media/boot/u-boot.img
|
2014-06-15 15:33:49 +02:00
|
|
|
cp output/images/zImage /media/boot/zImage
|
|
|
|
|
cp output/images/at91-sama5d3_xplained.dtb /media/boot/at91-sama5d3_xplained.dtb
|
|
|
|
|
|
|
|
|
|
Extract the root filesystem to the second partition:
|
|
|
|
|
|
|
|
|
|
sudo tar -C /media/rootfs -xf output/images/rootfs.tar
|
|
|
|
|
|
|
|
|
|
Unmount both partitions:
|
|
|
|
|
|
|
|
|
|
sudo umount /media/boot
|
|
|
|
|
sudo umount /media/rootfs
|
|
|
|
|
|
|
|
|
|
Insert your SD card in your Xplained board, and enjoy. The default
|
|
|
|
|
U-Boot environment will properly load the kernel and Device Tree blob
|
|
|
|
|
from the first partition of the SD card, so everything works
|
|
|
|
|
automatically.
|
|
|
|
|
|
