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External Memory Loader STM32H7S7 EXTMEM_MemCopy DMA Issue

neset
Associate II

Hello there, 

I'm trying to create an external loader for my stm32h7s7-dk board via MCE.

I followed this https://www.youtube.com/watch?v=JxhKmVUB2Ws&list=PLnMKNibPkDnFQXYK0ztHV9iMVS6EAtKpD&index=10 tutorial series and i check the github repo of this project. But the repo and the video series can be different. The instructor might add some new things. But the methodlogy cant work. Its really stupidly. 

The loader writes only 0x00 to flash for app size.

Screenshot from 2026-01-23 17-03-14.png



Im adding my ss of the mem_copy, mem_write and mpu init codes here.

Screenshot from 2026-01-23 17-01-23.png

Screenshot from 2026-01-23 17-01-31.png

Screenshot from 2026-01-23 17-01-41.png

  Please help me.

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