why we want to boot second-level bootloader boot from mmc in U-Boot?

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why we want to boot second-level bootloader boot from mmc in U-Boot?

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Hariharan1
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Hi Experts,

I am running First level bootloader in i.MX8M Mini using TCM memory which is done by ddr initialization and so on. Second level bootloader creating based on DDR Memory. Is it mandatory to boot Second level bootloader using mmc in uboot? 

 

I tried without mmc boot. it doesn't execute second level boot binary. can anyone explain this problem. 

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