1.3.1 How the SPI Bootloader library works
The SPI Bootloader firmware communicates with the embedded host device by using a predefined communication protocol.
The SPI Bootloader works in two different modes
Basic Mode
This mode is supported for all the devices
Resides from
The starting location of the flash memory region for CORTEX-M based MCUs
The Bootloader performs flash erase/program/verify operations with the binary sent from host while in the firmware upgrade mode
The binary sent is only of the application to be programmed
Bootloader always performs flash operation from the address for (bootloader or application) binary sent from host
The application can use the entire flash memory region starting from the end of bootloader space
Jumps to the application once verification is completed
Fail Safe Update Mode
This mode is supported for the devices which have a Dual Bank flash memory
Resides from the starting location of the flash memory region of both the banks on CORTEX-M based MCUs
The Bootloader performs flash erase/program/verify operations with the binary sent from host while in the firmware upgrade mode
Bootloader can perform flash operation in either of the banks based on the address sent by the host application
The application can use only the flash memory region of one bank.
Performs a bank swap and reset to run the application programmed in opposite bank once verification is completed or a normal reset to run the application in current bank based on command sent from host