How to boot from emmc with SD data

STEP 1. boot from SD

1a. bpi-copy xxx.img.zip #burn to emmc ;

1b. bpi-bootsel BPI_M2U_720P-emmc.img.gz /dev/mmcblk1 #auto download from github and burn to emmc;

1c. bpi-bootsel BPI-cleanboot-8k.img.gz /dev/mmcblk0 #auto download from github and burn to SD;

STEP 2. boot from emmc

2a. poweroff

2b, remove SD card

2c. poweron

2d. insert SD card

2e. fdisk /dev/mmcblk1 and mkfs -t ext4 /dev/mmcblk1p1

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