Open a terminal on your Linux PC and download the Linux Kernel sources from the main stream repository:
Extract the Kernel sources from the compressed file by typing:
tar xvfJ linux-4.19.128.tar.xz
Move inside the new folder:
Set the Kernet config for Aria:
wget https://www.acmesystems.it/www/aria_compile_kernel_4_19/acme-aria_defconfig -O arch/arm/configs/acme-aria_defconfig make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- acme-aria_defconfig
If you need to customize the Kernel configuration or you just want to take a look around the Kernel setup type:
make ARCH=arm menuconfig
and navigate inside the Kernel configuration using the arrow keys and following the help provided by the menuconfig interface.
Now compile the device tree file requested by your board by selecting one of the following commands:
wget https://www.acmesystems.it/www/aria_compile_kernel_4_19/acme-aria.dts -O arch/arm/boot/dts/acme-aria.dts make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- acme-aria.dtb
wget https://www.acmesystems.it/www/aria_compile_kernel_4_19/atmel_serial.c -O drivers/tty/serial/atmel_serial.c
Compile the Linux Kernel sources and generate the binary compressed image file to save in the first partition of microSD card.
make -j8 ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- zImage ... Image arch/arm/boot/zImage is ready
The image generated contains the Linux Kernel and all the built-in device drivers (option [*] in menuconfig) compiled with it.
Al the drivers compiled as external modules (option [M] in menuconfig)
need to be compiled and saved in the rootfs
/lib directory on the second
partition of the microSD. We didn't use any [M] flag in our defconfig so this procedure
is not requested but. in case you add something. these are the commands to use
to compile them:
make modules -j8 ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- make modules_install INSTALL_MOD_PATH=./modules ARCH=arm
Insert a formatted microSD with the boot loader (at91bootstrap) and the rootfs contents already created in your Linux PC and copy on it these files:
Write the Linux Kernel image and the device tree blob in the first microSD partition:
sudo cp arch/arm/boot/zImage /media/$USER/BOOT sudo cp arch/arm/boot/dts/acme-aria.dtb /media/$USER/BOOT
Write the Linux Kernel modules inside the second microSD partition:
sudo rsync -avc modules/lib/. /media/$USER/rootfs/lib/.
At the first access to the board command line update the module dependencies by typing this command: