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Setting up eMMC usually is the last step at development stage after the development work is done at your SD card or NFS environments. From software point of view, eMMC is nothing but a non-removable SD card on board. For SMARC-iMX8MP, the SD card is always emulated as /dev/mmcblk1 and on-module eMMC is always emulated as /dev/mmcblk2. Setting up eMMC now is nothing but changing the device descriptor. 

This section gives a step-by-step procedure to setup eMMC flash. Users can write a shell script your own at production to simplify the steps.

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$ sudo mkdir -p /media/boot/
$ sudo mkdir -p /media/rootfs/
 
for: DISK=/dev/mmcblk0
$ sudo mount ${DISK}p1 /media/boot/
$ sudo mount ${DISK}p2 /media/rootfs/
 
for: DISK=/dev/sdX
$ sudo mount ${DISK}1 /media/boot/
$ sudo mount ${DISK}2 /media/rootfs/

 

Copy Image to Image to rootfs partition:

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$ sudo cp -v /media/boot/Image /media/rootfs/home/root

Note
titleNote
  1. If your rootfs is Debian BullseyeUbuntu 18.04, copy to /media/rootfs/roothome/ubuntu instead of /media/rootfs/home/root


Copy uEnv.txt to rootfs partition:

Copy and paste the following contents to to /media/rootfs/home/root ($ $ sudo vim /media/rootfs/home/root/uEnv.txt)

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optargs="video=HDMI-A-1:1920x1080-32@60 consoleblank=0"
#optargs="video=HDMI-A-1:3840x2160-32@30 consoleblank=0"
#optargs="video=HDMI-A-1:3840x2160-32@60 consoleblank=0"
#console port SER3
console=ttymxc1,115200 earlycon=ec_imx6q,0x30890000,115200
#console port SER2
#console=ttymxc2,115200 earlycon=ec_imx6q,0x30880000,115200
#console port SER1
#console=ttymxc3,115200 earlycon=ec_imx6q,0x30a60000,115200
#console port SER0
#console=ttymxc0,115200 earlycon=ec_imx6q,0x30860000,115200
mmcdev=2
mmcpart=1
image=Image
loadaddr=0x40480000
fdt_addr=0x43000000
mmcroot=/dev/mmcblk2p2 rw
usbroot=/dev/sda2 rw
mmcrootfstype=ext4 rootwait fixrtc
netdev=eth0
ethact=FEC0
ipaddr=192.168.1.150
serverip=192.168.1.53
gatewayip=192.168.1.254
mmcargs=setenv bootargs console=${console} root=${mmcroot} rootfstype=${mmcrootfstype} ${optargs}
uenvcmd=run loadimage; run loadfdt; run mmcboot
# USB Boot
#usbargs=setenv bootargs console=${console} root=${usbroot} rootfstype=${mmcrootfstype} ${optargs}
#uenvcmd=run loadusbimage; run loadusbfdt; run usbboot

 

Copy device tree blob to rootfs partition:

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$ sudo cp -v /media/boot/dtbs/<device tree name> /media/rootfs/home/root/imx8mp-smarc.dtb


Copy boot file to rootfs partition:

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title~/imx-mkimage

$ sudo cp -v iMX8M/flash.bin /media/rootfs/home/root/imx8mp-smarcflash.dtbbin


Copy real rootfs to rootfs partition:

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$ pushd /media/rootfs

$ sudo tar cvfz ~/smarcimx8mp-emmc-rootfs.tar.gz .

$ sudo mv ~/smarcimx8mp-emmc-rootfs.tar.gz /media/rootfs/home/root

$ popd

Debian 11 Bullseye Bulleyes Root File Systems

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$ sudo vim /media/rootfs/etc/udev/rules.d/70-persistent-net.rules

Delete all contents starting with "SUBSYSTEM=="

$ pushd /media/rootfs

$ sudo tar cvfz ~/smarcimx8mp-emmc-rootfs.tar.gz .

$ sudo mv ~/smarcimx8mp-emmc-rootfs.tar.gz /media/rootfs/home/root/

$ popd


Remove Unmount SD card:.

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$ sync
$ sudo umount /media/boot
$ sudo umount /media/rootfs

It is safe to remove SD card now.

Copy Binaries to eMMC from SD card:

Insert this SD card into your SMARC-iMX8M device iMX8MP device and boot into SD card.

Now it will be almost the same as you did when setup your SD card, but the eMMC device descriptor is /dev/mmcblk2 now.

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$ export DISK=/dev/mmcblk2

Erase eMMCSD card:

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$ sudo dd if=/dev/zero of=${DISK} bs=2M 1M count=16160

Create Partition Layout:

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$ sudo sfdisk ${DISK} <<-__EOF__

 
2M,48M,0x83,*
 
50M,,,
__EOF__

Format Partitions:

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$ sudo mkfs.vfat -F 16 ${DISK}p1 -n boot
$ sudo mkfs.ext4 ${DISK}p2 -L rootfs

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Install binaries for partition 1

Copy Copy uEnv.txt/Image/*.dtb to dtb to the boot partition

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$ sudo cp -v Image uEnv.txt /media/boot/

...

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$ sudo mkdir -p /media/boot/dtbs

$ sudo cp -v imx8mp-smarc.dtb /media/boot/dtbs/

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Install Root File System

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$ sudo tar -zxvf smarcimx8mp-emmc-rootfs.tar.gz -C /media/rootfs

 

Unmount eMMC:

 

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$ sync
$ sudo umount /media/boot
$ sudo umount /media/rootfs

 

Flash boot file

 

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$ sudo dd if=flash.bin of=${DISK} bs=1024 seek=32

Switch your Boot Select to eMMC (OFF ON ON) and you will be able to boot up from eMMC now.

version 1.0a, 1008/25/2021

Last updated 2022-06-13