Bcm63381b0 Firmware -

void gpio_init() = (1 << 5); (volatile unsigned int )GPIO_DIR = dir;

// bcm63381_demo.dts /dts-v1/; #include "bcm63xx.dtsi" / model = "My BCM63381 Board"; compatible = "mycompany,bcm63381", "brcm,bcm63381"; bcm63381b0 firmware

gpio-leds compatible = "gpio-leds"; led_power label = "power"; gpios = <&gpio0 5 GPIO_ACTIVE_HIGH>; ; ; ; void gpio_init() = (1 &lt;&lt; 5); (volatile unsigned

memory@0 device_type = "memory"; reg = <0x0 0x4000000>; // 64 MB ; void gpio_init() = (1 &lt

CFE> load -raw -addr=0x80800000 minimal.bin CFE> go 0x80800000 If you want to develop a full router firmware , use OpenWrt (supports many BCM63xx chips).

// minimal.c - for BCM63381B0 bare-metal (CFE environment) #include <stdio.h> #include <cfe_api.h> // GPIO base address - you need BCM63381 datasheet for exact address #define GPIO_BASE 0x18000000 // example only, not real #define GPIO_DIR (GPIO_BASE + 0x00) #define GPIO_DATA (GPIO_BASE + 0x08)

Example: a minimal C program to blink an LED via GPIO.