The PRIME Firmware Upgrade service library is configured to work in conjunction with the
MEMORY driver to easily add any non-volatile memory to store the downloaded images.
In the PIC32CX MT device, the SEFC0 driver is configured as the download area, although
other areas can be selected as long as the Bootloader application is also modified
accordingly (refer to its documentation in the smartenergy_prime_apps
repository).
Figure 1-31. PRIME Firmware Upgrade
configuration
The parameters to configure are:
Firmware Upgrade Region Size: It is in hexadecimal, the reserved space
in memory for file downloading. This size must be equal to or less than the
size of the chosen memory
Buffer to write in flash: The size of the write buffer must be at least
the size of the write block size of the chosen memory in bytes
Buffer to read in flash: The size of the read buffer must be at least the
size of the read block size of the chosen memory in bytes.
Figure 1-32. Configuration of SEFC0 in
PIC32CX MT
In the applications provided by Microchip for the PIC32CX MT device, SEFC0 is used as the
associated memory. However, the parameters to configure will be the same for all
memories.
NVM Media Start Address: Starting address of the memory area where the
downloaded files will be stored
NVM Media Size (KB): Length of the Firmware Upgrade Region size. the
value should be the same as the one specified in the Firmware Upgrade PRIME
service configuration.
To configure the cryptographic algorithms required for the signature verification, the
following must be selected in the wolfCrypt module:Figure 1-33. Crypto configuration
