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# 1.3.4 SAMA5D2 Xplained Ultra Evaluation Kit: Building and Running the UART Bootloader with SD/eMMC media applications

Downloading and building the application

To clone or download this application from Github,go to the main page of this repository and then click Clone button to clone this repo or download as zip file. This content can also be download using content manager by following these instructions

Path of the application within the repository is apps/mpu_uart_bootloader/

To build the application, refer to the following table and open the project using its IDE.

Bootloader Application

Project Name | Description
--- | ---
bootloader_sd_emmc/firmware/sam_a5d2_xult.X | MPLABX Project for SAMA5D2 Xplained Ultra Evaluation Kit

Test Application

Project Name | Description
--- | ---
test_app/firmware/sam_a5d2_xult.X | MPLABX Project for SAMA5D2 Xplained Ultra Evaluation Kit

Setting up SAMA5D2 Xplained Ultra Evaluation Kit

- Short jumper JP2 (DEBUG_DIS)
- Connect the Debug USB port on the board to the computer using a micro USB cable
- SD Card with FAT32 file system

Setting up the host script

- Refer to Bootloader Host Script Help for setting up the btl_host.py utility used to send the application binary from host PC

Running the Application

1. Open the test application project test_app/firmware/sam_a5d2_xult.X in the IDE

2. Build the project to generate the harmony.bin binary (Do not program the binary)

3. Open the bootloader project bootloader_sd_emmc/firmware/sam_a5d2_xult.X in the IDE

4. Build the project to generate the harmony_bootloader.bin binary (Do not program the binary)

5. Copy the MPU bootstrap loader binary (boot.bin) from <harmony3_path>/bootloader_apps_uart/deps/at91bootstrap_binaries_sam_a5d2_xult/sd_card/boot.bin onto the SD Card

6. Copy the harmony bootloader binary (harmony_bootloader.bin) from <harmony3_path>/bootloader_apps_uart/apps/mpu_uart_bootloader/bootloader_sd_emmc/firmware/sam_a5d2_xult.X/dist/sam_a5d2_xult/production/harmony_bootloader.bin onto the SD Card

7. Insert the SD card into SDMMC1 connector J19 on the board

8. Reset or Power cycle the device. GREEN LED will be turned-on to indicate that harmony bootloader code is running on the target

9. Run the btl_host.py from command prompt to program the application binary

        python <harmony3_path>/bootloader/tools/btl_host.py -v -i <COM PORT> -d sama5 -f <harmony3_path>/bootloader_apps_uart/apps/mpu_uart_bootloader/test_app/firmware/sam_a5d2_xult.X/dist/sam_a5d2_xult/production/harmony.bin

10. Following snapshot shows output of successfully programming the test application

    - Rebooting and Reboot Done messages in below output signifies that bootloading is successful

11. If above step is successful then the GREEN LED should start blinking

12. Open the Terminal application (Ex.:Tera Term) on the computer

13. Configure the serial port settings as follows:

    - Baud : 115200
    - Data : 8 Bits
    - Parity : None
    - Stop : 1 Bit
    - Flow Control : None

14. Reset or Power cycle the device

15. GREEN LED should start blinking and you should see below output on the console

16. Press and hold the Switch PB_USER and then press Reset button or Power cycle the device to force trigger bootloader at startup

17. Repeat Steps 9-15 once

    - This step is to verify whether bootloader is triggered by switch press at reset

Additional Steps (Optional)

- To bootload any other application refer to Configuring an application to be bootloaded for MPUs