hi all,
I'm using STM32L562VETQ.
I'm new to such topics but i want to implement OTA firmware update in which i want to divide the flash into 2 sections (ota0 and ota1).
*The process in short is as following:
1- The MCU image/firmware (.bin file) will be uploaded to a server
2- A modem will download that image (.bin file) and send it over UART to the MCU (piece by piece)
3- The MCU will receive those pieces and will flash them -using the "HAL_FLASH_Program()" function- to the target OTA section (if the current running ota section is ota0 then the target will be ota1 and vice versa)
*The question is:
1- What should i do in the linker-script file to divide the memory into two sections? and should i do that? or it's okay to leave the flash as one block and just determine the starting address of the new-image when flashing it?
2- After flashing, How can i transfer the control-flow to the new flashed-image ? should i use pointer-to-function and manually call the reset-handler of the flashed image ? or is there any built-in function to do so ?
*Additional info:
1- here is the linker-script
/* Entry Point */
ENTRY(Reset_Handler)
/* Highest address of the user mode stack */
_estack = ORIGIN(RAM) + LENGTH(RAM); /* end of "RAM" Ram type memory */
_Min_Heap_Size = 0x200 ; /* required amount of heap */
_Min_Stack_Size = 0x400 ; /* required amount of stack */
/* Memories definition */
MEMORY
{
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 192K
ROM (rx) : ORIGIN = 0x8000000, LENGTH = 512K
}and here's what i have done (not sure if it's correct to do that but i have changed the size of the flash to 256k and its origin will varies based on the image that i want to compile -either ota0 image or ota1- )
/* Entry Point */
ENTRY(Reset_Handler)
/* OTA sections addresses */
_OTA0_ADDRESS = 0x8000000;
_OTA1_ADDRESS = 0x8040000;
/* Highest address of the user mode stack */
_estack = ORIGIN(RAM) + LENGTH(RAM); /* end of "RAM" Ram type memory */
_Min_Heap_Size = 0x200 ; /* required amount of heap */
_Min_Stack_Size = 0x400 ; /* required amount of stack */
/* Memories definition */
MEMORY
{
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 192K
ROM (rx) : ORIGIN = _OTA0_ADDRESS, LENGTH = 256K
}2- Also here's an image of the flash memory for the MCU that i'm using (ota0 in bank1 and ota1 in bank2):
