# Switch the CPU from ARMv7 into ARMv8 (aarch64) mode arm_control=0x200 enable_uart=1 upstream_kernel=1 # Activate I2C dtparam=i2c_arm=on # Activate DS1307 RTC module dtoverlay=i2c-rtc,ds1307 # Apply device tree overlay to enable pull-up resistors for buttons device_tree_overlay=overlays/mygpio.dtbo kernel=vmlinuz-4.19.0-10-arm64 # For details on the initramfs directive, see # https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=10532 initramfs initrd.img-4.19.0-10-arm64