Linux Kernel¶

The following instructions are for compiling the Linux Kernel for the MitySOM-A5E outside of Yocto. These instructions are specifically to support the MitySOM-A5E as installed in the MitySOM-A5E DevKit Carrier board.

Prerequisites¶

Need to have the GCC-ARM-11.2 toolchain. The toolchain can be downloaded and sourced via the following:

wget https://developer.arm.com/-/media/Files/downloads/gnu/11.2-2022.02/binrel/gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu.tar.xz
tar xf gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu.tar.xz
rm -f gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu.tar.xz
export PATH=`pwd`/gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu/bin:$PATH
export ARCH=arm64
export CROSS_COMPILE=aarch64-none-linux-gnu-

Obtaining the Linux Kernel source¶

Description	Repository	Branch
Linux Kernel	git://support.criticallink.com/home/git/linux-socfpga.git	socfpga-6.12.33-lts

The kernel source can be fetched using git:

git clone -b socfpga-6.12.33-lts git://support.criticallink.com/home/git/linux-socfpga.git
cd linux-socfpga

defconfig	mity_a5e_devkit_defconfig
device tree	intel/socfpga_agilex5_mitysom_mini_devkit.dts

Compile the kernel¶

Apply the defconfig¶

make mity_a5e_devkit_defconfig

Kernel Image¶

make -j 7 Image

The resulting Image file can be installed into the /boot directory of the SD card (ext partition)

Device Tree¶

The following command will build the device tree for the MitySOM-A5E loaded into the MitySOM-A5E DevKit board.

make dtbs

The resulting dtb file of interest (E.g. socfpga_agilex5_mitysom_mini_devkit.dtb) can be installed into /boot directory of the SD card (ext partition)

Modules¶

make -j 7 modules
mkdir modules
make INSTALL_MOD_PATH=modules modules_install

The resulting modules/lib/modules/6.12.33-g* directory should be copied into /lib/modules directory of the SD card (ext partition)