Deploy the kernel on your target

This topic shows how to deploy a customized kernel and/or device tree to your target device.

After customizing the kernel source code, you may either have built a full Digi Embedded Yocto image recipe or just the kernel recipe.

Program image files (full partition update)

If you built a full image recipe (core-image-base, for example), Digi Embedded Yocto generates an image file for the linux partition, such as:

core-image-base—ccimx91-dvk.boot.vfat or similar on the ConnectCore 93 Development Kit.

The most straightforward way to program image files is from U-Boot console, using the update command. For example, to program via Ethernet:

Save the image file to your TFTP exposed folder.
Boot the target and press any key to stop the automatic U-Boot boot process.
Run the update command to update the entire linux partition:
```
=> update linux tftp <image-filename>
```

See Program images from U-Boot for additional information on updating from U-Boot.

Program single files

If you built only the kernel recipe, you can find the kernel binary and device tree blobs in the tmp/deploy/images/ folder of your project. You can deploy these single files to your linux partition, which is formatted in FAT file system.

Update files from U-Boot

Power on your target and press any key to stop automatic U-Boot boot process.
List the contents of the linux partition:
Run the updatefile command to update a file from the U-Boot console, for example via TFTP:
```
=> updatefile linux tftp <filename>
```

See Update files within partition, for additional information.

Update files from Linux

The linux partition is automatically mounted to /mnt/linux, but as a read-only file system.

Remount the linux partition with read/write permissions:
```
$ mount -o remount,rw /dev/mmcblk0p1 /mnt/linux
```

List the contents of the linux partition:

# ls -l /mnt/linux/
-rwxr-xr-x    1 root     root      14094849 Apr  5  2011 Image.gz-ccimx91-dvk.bin
-rwxr-xr-x    1 root     root           776 Apr  5  2011 _ov_board_enet2_ccimx9-dvk.dtbo
-rwxr-xr-x    1 root     root           804 Apr  5  2011 _ov_board_mikroe-accel2-click_ccimx9-dvk.dtbo
-rwxr-xr-x    1 root     root           792 Apr  5  2011 _ov_board_mikroe-gyro-click_ccimx9-dvk.dtbo
-rwxr-xr-x    1 root     root           421 Apr  5  2011 _ov_som_bt_ccimx9.dtbo
-rwxr-xr-x    1 root     root           481 Apr  5  2011 _ov_som_wifi_ccimx9.dtbo
-rwxr-xr-x    1 root     root          3082 Apr  5  2011 boot.scr
-rwxr-xr-x    1 root     root         61017 Apr  5  2011 ccimx91-dvk.dtb

Copy the file you want to the target, for example via SSH:

$ scp Image.gz root@<cc91-ip>:/mnt/linux/Image.gz-ccimx91-dvk.bin