Third-party board + USB drive to start the car

If you purchased the ROSMASTER-A1 car without a board and are using a third-party NANO board with a USB drive, you will need to follow the instructions below.

Those who did not purchase a third-party board can skip this step.

1. Flashing the USB Drive

After flashing the EMMC bootloader, you can directly boot the system from a USB drive with the modified extlinux.conf configuration file. There is no need to specify the JetPack version for the EMMC and USB drive systems.

1.1 Connecting the Jetson Nano B01 to a Virtual Machine

• Prepare the Jetson Nano B01 board, jumper caps, display, mouse and keyboard.
• Enter the Jetson Nano B01 into the system REC flashing mode. Connect the jumper cap to the FC REC and GND pins, which are the second and third pins on the carrier board below the core board, as shown below:

Connect the HDMI display, mouse, and keyboard to the Jetson Nano B01, plug in the power cord, and finally, plug in the microUSB cable. Since the jumper cap was connected to the FC REC and GND pins in the previous step, the system will automatically enter REC flashing mode after powering on.

Normally, the following window will pop up after plugging in the microUSB cable. Note that when using a virtual machine, you must set the device to connect to the virtual machine.

1.2 Start Flashing

Note: It is recommended to use the virtual machine specifically for flashing, which is available in Baidu Cloud Drive. This already contains the Jetson_Boot_USB file, allowing you to directly run the flashing process.

• Transfer the Jetson_Boot_USB.tar.gz file from Baidu Cloud Drive to the Ubuntu 18.04 system and open a terminal to run the decompression command.

tar xzvf Jetson_Boot_USB.tar.gz

• After unzipping, navigate to the Jetson_Boot_USB folder, then

xxxxxxxxxx
cd Jetson_Boot_USB/
ls

• Run the following command to burn the EMMC boot file.

xxxxxxxxxx
sudo ./flash.sh -r jetson-nano-devkit-emmc mmcblk0p1

• Finally, wait for the file to be burned into the EMMC. A prompt will appear if successful:

"The target t210ref has been flashed successfully. Reset the board to boot from internal eMMC."

If an error message appears, please confirm that the Jetson Nano B01 is properly connected and in flashing mode, then reconnect according to the first step.