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Configure SD Card for Flashing

The images to be flashed SD card image "fsl-image-gui-imx7d-phyboard-zeta.sdcard" can be flashed to eMMC. This image will need to be copied to the /Boot imx7-p/boot partition of a properly formatted SD card as described in the Creating a Bootable SD Card section of the Quickstart. Additionally, the root filesystem fsl-image-gui-imx7d-phyboard-zeta.ext4 image and u-boot.imx will need to be copied over to the SD card.

Copy u-boot.imx to the boot partition of the SD card: 

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1. Due to the size of the root file system image, a new partition is required on the SD card to hold it. To create an additional partition that extends to the rest of the SD card, execute the following from your host machine:

   Code Block

   sudo fdisk /dev/sd<X> p print partition table. *Note end of partition /dev/sd<x>2* n new partition p primary 3 partition number 1581056 (start at<start> enter value after end of partition 2 (from partition table). This is the first sector of partition 3 <enter> Use default value for last sector t Change partition system id 3 Partition number c FAT32 w write table to disk and exit sudo mkfs.vfat -n "data" /dev/sd<X>3

2. Copy the root file system sdcard image to the new "data" partition:

   Code Block
   cp fsl-image-gui-imx7d-phyboard-zeta.ext4sdcard /media/data/; sync

Partition eMMC from

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U-Boot

1. Configure the boot switch to boot from SD Card as described in Selecting Boot Modes. Power on the board and boot fully into Linux.

2. Format eMMC (mmcblk2):

   Code Block

   fdisk /dev/mmcblk2 u Change display/entry units to sectors instead of cylinders o Create a new empty DOS partition table n Create new partition p Create a primary partition 1 partition number 1 4096 First sector 20479 Last sector n Create new partition p Create a primary partition 2 Partition number 2 20480 First sector <enter> Using the default value will create a partition that extends to the last sector of the media w write partition table to eMMC and exit fdisk mkfs.vfat /dev/mmcblk2p1

U-Boot

Flash u-boot to eMMC. The i.MX7 expects an Image Vector Table offset of 0x400 bytes for SD boot device type.

dd if=/run/media/mmcblk0p1/u-boot.imx of=/dev/mmcblk2 bs=512 seek=2

Linux/DTB

Copy the kernel and device tree file to eMMC:

# The eMMC partitions will mount to /run/media/ on boot. If you just partitioned eMMC, you may manually mount the partition:
mkdir /run/media/mmcblk2p1
mount /dev/mmcblk2p1 /run/media/mmcblk2p1
 
cp /run/media/mmcblk0p1/zImage /run/media/mmcblk2p1/
cp /run/media/mmcblk0p1/imx7d-phyboard-zeta.dtb /run/media/mmcblk2p1/

Root Filesystem

Flash the root filesystem to eMMC, partition 2.

1. stop in U-Boot.

2. Flash fsl-image-gui-imx7d-phyboard-zeta.sdcard from the SD card to eMMC. This will partition the card and copy u-boot, zImage, dtb, and root filesystem to eMMC.

   Code Block
   => fatload mmc 0:3 ${loadaddr} fsl-image-gui-imx7d-phyboard-zeta.sdcard reading fsl-image-gui-imx7d-phyboard-zeta.sdcard 935329792 bytes read in 41164 ms (21.7 MiB/s) => mmc dev 1 switch to partitions #0, OK mmc1(part 0) is current device => mmc write ${loadaddr} 0x0 <number of blocks to write. In this case 0x1BF000> MMC write: dev # 1, block # 0, count 1830912 ... 1830912 blocks written: OK

    

    

3. Reset the board. Stop in U-Boot again and check that the partition table for eMMC is as expected.

   Code Block
   => reset   ...   => mmc dev 1 switch to partitions #0, OK mmc1(part 0) is current device => mmc part Partition Map for MMC device 1 -- Partition Type: DOS Part Start Sector Num Sectors UUID Type 1 8192 16384 ef3963c1-01 0c 2 24576 1794048 ef3963c1-02 83