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How to use SD card as flash

Hi everyone,

I have implemented ARM M4 to a SoC, but it's unfortunate that there's no memory.

Is there any chance that I can use MicroSD card as memory?

If it's possible, can someone show me how?

To be specific, I have QUAD-SPI (ARM - Flash memeroy) pins on PCB connected to a MicroSD Memory Card Connector attached with an SD Card that I am intend to use as Flash for ARM.

What should I write to the SD card? and how?

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