Initialize the pins, peripheral and memory device.
Should then be able to access memory the same way as the other memory in the MCU, usually slower, and potentially Read Only, depending on what type of memory device you are talking about.
Try to frame your questions better.
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Actually i was trying to run mobilenetV2 on stm32h723zg using stm32cubeMx, After enabling external flash and external memory i was able to analyze and validate on desktop but while validating on target i am getting memory overflow error