# See /boot/overlays/README for all available options gpu_mem=64 arm_64bit=1 # Specifies a subdirectory for overlays and device trees overlay_prefix=overlays/ device_tree=broadcom/bcm2711-rpi-4-b.dtb # Enable USB gadget mode dtoverlay=dwc2 dr_mode=peripheral # Enable DRM VC4 V3D driver on top of the dispmanx display stack dtoverlay=vc4-fkms-v3d max_framebuffers=2 # Route interrupt via the GIC-400 enable_gic=1 # Enable the first PL011 (UART0) the primary UART enable_uart=1 uart_2ndstage=1 dtoverlay=miniuart-bt # AArch64 kenrnel kernel=kernel8.img initramfs initramfs-linux.img followkernel