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Linux/AM4379: Can't boot from eMMC

Part Number: AM4379

Tool/software: Linux

Dear Friends 

I have purchased EVM - AM4379 Board from EMA-tech company   www.ema-tech.com/en_product

I am having a strange problem in AM4379 EVM Board. I cant boot EVM from eMMC But I successfully boot my EVM Board in SD card booting method. 

I followed the procedure from user manual here i have attached the user manual PDF.

I can see u-boot console in Linux Host system in minicom terminal by using SD card boot

But I cant see u-boot console in Linux host system in minicom. 

What I done before is following 

Step 1 :

I can successfully partition the eMMC memory  mkcard_ext4.sh partion script that i got from my vendor.

Step 2 :

Burn the Linux yocto OS in eMMC as per the user manual 

Step 3 :

Short the boot jumper using cap on SOM4379 and power on the EVM but nothing is showed in Linux host system in Serial terminal (minicom). so in that case I cant see u-boot  log in console.

Help me out to fix this problem. 

Thanks & Regards  

VIVEK R

EVM437x-User's Manual(1).pdf