This buildroot external includes Microchip packages, patches, setup, and configuration to create the SAMA5 demo. This project provides an extension to buildroot to support these customizations outside of the standard buildroot tree.
The external is tested on Ubuntu 16.04 LTS. The following system build dependencies are required.
sudo apt-get install subversion build-essential bison flex gettext \
libncurses5-dev texinfo autoconf automake libtool mercurial git-core \
gperf gawk expat curl cvs libexpat-dev bzr unzip bc python-dev
In some cases, buildroot will notify that additional host dependencies are required. It will let you know what those are.
Many of the demo applications included in this external depend on Qt 5.9 or later. This buildroot external requires a new version of buildroot equal to or greater than 2018.02-at91.
Clone, configure, and build. When building, use the appropriate defconfig in
the buildroot-external-microchip/configs directory for your board.
git clone https://github.com/linux4sam/buildroot-external-microchip.git
git clone https://github.com/linux4sam/buildroot-at91.git -b 2018.02-at91
cd buildroot-at91
BR2_EXTERNAL=../buildroot-external-microchip/ make sama5d4_xplained_demo_defconfig
make
The resulting bootloader, kernel, and root filesystem will be put in the
'output/images' directory. There is also a complete sdcard.img.
Userspace packages and the Linux kernel, for example, can be optionally selected and configured using buildroot.
To configure userspace packages and build:
make menuconfig
make
To configure the kernel and build:
make linux-menuconfig
make
Create a list of software licenses used:
make legal-info
A SD card image is generated in the file sdcard.img. The first partition of
this image contains a FAT filesystem with at91bootstrap, u-boot, a u-boot env,
DTB files, and kernel. The second partition contains the root filesystem. This
image can be written directly to an SD card.
You need at least a 1GB SD card. All the data on the SD card will be lost. Find the device node name for your card. To copy the image on the SD card:
cd output/images
sudo dd if=sdcard.img of=/dev/sdX bs=1M
Another method, which is cross platform, to write the SD card image is to use Etcher.
For more information on how these components are generated and what makes up a bootable SD card, see SDCardBootNotice.
You may have to manually set the DTB file to be inline with the actual display
you are using. To do this, as the board is booting hold down the enter key in
the debug serial console until you get to the u-boot command prompt. Use the
following commands to set and save the dtb_name variable.
=> setenv dtb_name at91-sama5d2_xplained_pda7.dtb
=> saveenv
=> boot
For more information on using and updating buildroot, see the buildroot documentation.
This project is licensed under the GPLv2 or later with exceptions. See the
COPYING file for more information. Buildroot is licensed under the GPLv2
or later with exceptions. See the COPYING file in that project for more
information.