diff --git a/hw/bsp/raspberrypi4/family.c b/hw/bsp/raspberrypi4/family.c
new file mode 100644
index 0000000..ba0b270
--- /dev/null
+++ b/hw/bsp/raspberrypi4/family.c
@@ -0,0 +1,144 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#include "bsp/board.h"
+#include "board.h"
+
+#include "broadcom/interrupts.h"
+#include "broadcom/io.h"
+#include "broadcom/mmu.h"
+#include "broadcom/caches.h"
+#include "broadcom/vcmailbox.h"
+
+// LED
+#define LED_PIN               18
+#define LED_STATE_ON          1
+
+// Button
+#define BUTTON_PIN            16
+#define BUTTON_STATE_ACTIVE   0
+
+//--------------------------------------------------------------------+
+// Forward USB interrupt events to TinyUSB IRQ Handler
+//--------------------------------------------------------------------+
+void USB_IRQHandler(void)
+{
+  tud_int_handler(0);
+}
+
+//--------------------------------------------------------------------+
+// MACRO TYPEDEF CONSTANT ENUM
+//--------------------------------------------------------------------+
+
+//--------------------------------------------------------------------+
+// Board porting API
+//--------------------------------------------------------------------+
+void board_init(void)
+{
+  setup_mmu_flat_map();
+  init_caches();
+
+  // LED
+  gpio_initOutputPinWithPullNone(LED_PIN);
+  board_led_write(true);
+
+  // Button
+  // TODO
+
+  // Uart
+  uart_init();
+
+  // Turn on USB peripheral.
+  vcmailbox_set_power_state(VCMAILBOX_DEVICE_USB_HCD, true);
+
+  // Timer 1/1024 second tick
+  SYSTMR->CS_b.M1 = 1;
+  SYSTMR->C1 = SYSTMR->CLO + 977;
+  BP_EnableIRQ(TIMER_1_IRQn);
+
+  BP_SetPriority(USB_IRQn, 0x00);
+  BP_ClearPendingIRQ(USB_IRQn);
+  BP_EnableIRQ(USB_IRQn);
+  BP_EnableIRQs();
+}
+
+void board_led_write(bool state)
+{
+  gpio_setPinOutputBool(LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
+}
+
+uint32_t board_button_read(void)
+{
+  return 0;
+}
+
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  for (int i = 0; i < len; i++) {
+    const char* cbuf = buf;
+    while (!UART1->STAT_b.TX_READY) {}
+    if (cbuf[i] == '\n') {
+      UART1->IO = '\r';
+      while (!UART1->STAT_b.TX_READY) {}
+    }
+    UART1->IO = cbuf[i];
+  }
+  return len;
+}
+
+#if CFG_TUSB_OS  == OPT_OS_NONE
+volatile uint32_t system_ticks = 0;
+
+void TIMER_1_IRQHandler(void)
+{
+  system_ticks++;
+  SYSTMR->C1 += 977;
+  SYSTMR->CS_b.M1 = 1;
+}
+
+uint32_t board_millis(void)
+{
+  return system_ticks;
+}
+#endif
+
+void HardFault_Handler (void)
+{
+  // asm("bkpt");
+}
+
+// Required by __libc_init_array in startup code if we are compiling using
+// -nostdlib/-nostartfiles.
+void _init(void)
+{
+
+}