Shared SDRAM via FMC with dual core stm32h745

I am seeing the same issue as this question here :

I can configure SDRAM access on the STM32H745 for the M7, but when running two cores I cannot get access from the M4 to work at all.

I note that the thread was never resolved.

Is there any guidance documentation on how to configure this, or any sample projects that show both cores accessing SDRAM?

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