1.3 MPU UART Bootloader

This example application shows how to use the Harmony Bootloader to bootload an application from SD/eMMC/NAND/Serial Flash memory and receives new application image using UART protocol and write it to SD/eMMC/NAND/Serial Flash memory.

Bootloader Application

• This is a bootloader application which resides from:

  • Bootloader stored into SD/eMMC/NAND/Serial Flash memory

  • Bootloader executes from DDR memory. AT91Bootstrap loads bootloader from SD/eMMC/NAND/Serial Flash memory to DDR memory and executes it.

• It uses the DBGU Com port of the device to receive application binary from host PC

• It calls the bootloader_Tasks() function which receives application to be programmed into SD/eMMC/NAND/Serial Flash memory over UART channel. And it loads application image from SD/eMMC/NAND/Serial Flash memory to DDR memory and executes it.

• It turns on an LED

• Trigger methods:

  • It uses the On board Switch as bootloader trigger pin to force enter the bootloader at reset of device

Test Application

• This is a test application which resides from:

  • Application stored into SD/eMMC/NAND/Serial Flash memory

• It will be loaded from SD/eMMC/NAND/Serial Flash memory to DDR memory by bootloader application and starts application execution

• It blinks an LED and provides console output