Newly aquired Jetson Orin NX will not boot up on inital setup

PJ_Glasso · April 16, 2025, 3:26pm

Hi there,

This may be helpful,
Here’s a clear explanation to help with the use of UART on the A603 board (which is based on the Bouffalo Lab BL602/BL604 SoC):

Getting Started with UART on A603 (BL602/BL604)

The A603 board has built-in support for UART (Universal Asynchronous Receiver/Transmitter) and it’s typically used for debugging, communication with sensors, or sending data to another microcontroller or computer.

Default UART Pins on A603

Function	Pin on A603	GPIO
UART TX	Pin 10	GPIO 14 (UART0_TXD)
UART RX	Pin 11	GPIO 15 (UART0_RXD)

These are the default UART0 pins used for both programming and serial debugging.

BL602 SDK / Dev Framework Options

You can use one of the following to work with UART on A603:

1. Arduino (if supported by your firmware fork)

Use Serial.begin(115200);, Serial.print() and Serial.read() just like with ESP32 or STM32.

2. BL602 IoT SDK (Official from Bouffalo Lab)

Use the standard bl_uart_* functions.

3. BL602 IoT SDK with FreeRTOS or Rust SDK (alternative)

Sample UART Code (C with IoT SDK)

#include <bl_uart.h>
#include <blog.h>
#include <stdio.h>
#include <string.h>

void main()
{
    const char *msg = "Hello from A603 via UART!\r\n";
    bl_uart_init(0, 115200, 8, 1, 0, 0);  // UART0, 115200 baud

    while (1) {
        bl_uart_data_send(0, (uint8_t *)msg, strlen(msg));
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
}

How to Receive UART Data

char buffer[64];
int len = bl_uart_data_recv(0, (uint8_t *)buffer, sizeof(buffer));
if (len > 0) {
    buffer[len] = '\0';
    printf("Received: %s\n", buffer);
}

Toolchains & Flashing

Use blflash to flash the firmware to A603.
USB-to-UART cable connects directly to TX/RX.
For logging, use a terminal like minicom, PuTTY, or screen at 115200 baud.

Notes

If using UART1 or UART2, you may need to manually configure pinmux in the BL602 GPIO system.
Make sure no conflict with boot/flash mode pins (GPIO8/9). Straping /Boot pins.
Check the WiKi for additional Info.

HTH
GL PJ