Dtb Firmware < 2024 >

uart0: serial@1e000000 { compatible = "ns16550a"; reg = <0x1e000000 0x1000>; interrupts = <1>; clock-frequency = <24000000>; current-speed = <115200>; status = "okay"; };

dtc -I dtb -O dts -o extracted.dts myboard.dtb The DTB is typically loaded by the bootloader (U-Boot, barebox, or directly by the kernel). Example U-Boot commands:

/dts-v1/; / { model = "MyCustomBoard v1.0"; compatible = "mycompany,myboard"; #address-cells = <1>; #size-cells = <1>; dtb firmware

cpus { #address-cells = <1>; #size-cells = <0>;

mmc@1e100000 { compatible = "mycompany,mmc"; reg = <0x1e100000 0x1000>; interrupts = <2>; max-frequency = <50000000>; bus-width = <4>; status = "okay"; }; uart0: serial@1e000000 { compatible = "ns16550a"; reg =

tftp myboard.dtb fdt addr $loadaddr bootz $kernel_addr - $fdt_addr Or when building a Linux kernel with the DTB appended:

usb@1e200000 { compatible = "generic-ehci"; reg = <0x1e200000 0x1000>; interrupts = <3>; status = "okay"; }; }; }; Save the .dts file, then use the Device Tree Compiler: uart0: serial@1e000000 { compatible = "ns16550a"

chosen { bootargs = "console=ttyS0,115200 root=/dev/mmcblk0p2 rw rootwait"; stdout-path = &uart0; };