Hi,
We have a custom board based on STM32H755. We have two configuration of this SoC. In the normal operation we run a Bare-metal application on M7 and Zephyr OS application on M4 in a dual core mode. When requiring firmware update, we run a Zephyr application on M7 alone.
1) In the dual core mode, M4 Zephyr OS sees two flash partitions
image2 - read only - 896KiB
bootloader - read/write - 128KiB
2) In the firmware update application
M7 sees both banks and following partitions
Bank 0
image1 - read-write- 896KiB
configuration read/write - 128KiB
Bank 1
image 2 - read-write- 896KiB
bootloader - read only - 128KiB
I am able to update bootloader partition in 1) without IWDG1/WWDG1 enabled. Similarly I am able to update image1, configuration and image 2 partitions without IWDG1/WWDG1 enabled.
But when I enable IWDG1/WWDG1, firmware update doesn't work on Bank 1 partitions (bootloader partition in case 1) and image 2 partition on Bank 1. It either get hung or board reset reset cause Watchdog reset.
So there is some interaction between Flash erase/write on bank 1 with watchdog. Need your help to understand this issue and for a potential solution.
