config
arm_64bit=1 enable_uart=1 uart_2ndstage=1 enable_gic=1 armstub=RPI_EFI.fd disable_commandline_tags=1 disable_overscan=1 device_tree_address=0x1f0000 device_tree_end=0x200000 dtoverlay=miniuart-bt
arm_64bit=1 enable_uart=1 uart_2ndstage=1 enable_gic=1 armstub=RPI_EFI.fd disable_commandline_tags=1 disable_overscan=1 device_tree_address=0x1f0000 device_tree_end=0x200000 dtoverlay=miniuart-bt