Boot the system | ConnectCore 95

This topic explains how to boot Digi Embedded Yocto images without updating the firmware on the internal eMMC. This is helpful during the development phase, as it preserves the original firmware on the SOM.

Open a serial connection

You must open a serial connection to communicate with your device.

Open a serial connection using any terminal program such as Tera Term, Minicom, Coolterm, or HyperTerminal. This documentation demonstrates using Minicom to work with the device command line.

Use the following settings:

Parameter Value

Port

Serial port where the device is connected

Baud rate

115200

Data bits

8

Parity

None

Stop bits

1

Flow control

None

Parameter	Value
Port	Serial port where the device is connected
Baud rate	115200
Data bits	8
Parity	None
Stop bits	1
Flow control	None

Reset the device by pressing the reset button on the board. Then immediately press any key in the serial terminal to stop the auto-boot process. The U-Boot bootloader prompt displays:

U-Boot SPL dub-2024.04-r4.1+g31c334d1683+p0 (Dec 14 2025 - 19:00:06 +0000)
SOC: 0xb0009500
LC: 0x40010
SYS Boot reason: por, origin: -1, errid: -1
SYS shutdown reason: por, origin: -1, errid: -1
DDRMIX is powered UP
Normal Boot
Trying to boot from MMC1
Primary set selected
Load image from MMC/SD 0xda800
NOTICE:  BL31: v2.10.0  (release):lf-6.6.52-2.2.1-dirty
NOTICE:  BL31: Built : 21:05:58, Nov 30 2025


U-Boot dub-2024.04-r4.1+g31c334d1683+p0 (Dec 14 2025 - 19:00:06 +0000)

CPU:   i.MX95 rev2.0 at 1800MHz
CPU:   Extended Industrial temperature grade (-40C to 125C) at 41C
LM Boot reason: por, origin: -1, errid: -1
LM shutdown reason: por, origin: -1, errid: -1
Model: Digi ConnectCore 95 Development Kit
DRAM:  7.8 GiB
TCPC:  Vendor ID [0x1fc9], Product ID [0x5110], Addr [I2C2 0x53]
cfg name not match mx95alt:ccimx95dvk, ignore
Core:  268 devices, 34 uclasses, devicetree: separate
MMC:   FSL_SDHC: 0, FSL_SDHC: 1
Loading Environment from MMC... OK
Fail to setup video link
In:    serial
Out:   serial
Err:   serial

BuildInfo:
  - SM firmware Build 646, Commit 707569f4, Nov 30 2025 21:12:42
  - ELE firmware version 2.0.2-c110ba4b

   WARNING: Dummy default MAC in 'eth1addr'
flash target is MMC:0
Net:   WARNING: no MAC address assigned for MAC0
imx_get_mac_from_fuse: fuse read err: 0
eth0: enetc-0 [PRIME]Could not get PHY for emdio-0: addr 1

Fastboot: Normal
Normal Boot
Hit any key to stop autoboot:  0
=>

Boot the system from network

This shows how to transfer the images to the target via TFTP or NFS, and mount an NFS root file system.

This requires that you set up your PC workstation as explained in Set up native Linux PC.

1. Prepare the device artifacts

Get the Digi Embedded Yocto firmware images to boot from network:
- The kernel file: Image.gz.
- The device tree: ccimx95-dvk.dtb.
- Any device tree overlays files that apply to your hardware: <device-tree-overlay-file>.dtbo (see Pre-compiled device tree overlays).
- The compressed root file system: <rootfs-file>.tar.xz.
1. After building the Digi Embedded Yocto firmware, you can find the image files inside the project directory at <project_folder>/tmp/deploy/images/ccimx95-dvk.
2. You can download Digi-provided pre-built images from XWayland images.
Untar the root file system tarball (*.tar.xz) in the NFS exported directory of your development workstation. See Set up native Linux PC.
```
$ sudo tar xvfp image.tar.xz -C /exports/nfsroot-ccimx95_dvk
```
Copy the kernel *.bin file to the TFTP exported directory of your development workstation.
```
$ sudo cp <kernel-file>.bin /tftpboot
```
Copy the device tree *.dtb file to the TFTP exported directory of your development workstation.
$ sudo cp <device-tree-file>.dtb /tftpboot
(Optional) Copy any device tree overlay *.dtbo files that apply to your variant to the TFTP exported directory of your development workstation.
```
$ sudo cp <device-tree-overlay-file>.dtbo /tftpboot
```

2. Configure your device’s network settings

Get a dynamic IP for your target:

=> setenv autoload no
=> dhcp

or you can set a static IP:

=> setenv ipaddr 192.168.115.222

Configure the IP of the development workstation with TFTP and NFS servers installed. See Set up native Linux PC:
```
=> setenv serverip 192.168.115.1
```

3. Boot from network

Boot from TFTP+NFS

Set the directory with the rootfs to mount. This directory is the one exported via NFS in your development workstation. See Set up an NFS server.
```
=> setenv rootpath /exports/nfsroot-ccimx95_dvk
```
Specify the device tree (*.dtb) file name. This is the name of the *.dtb file you copied to the TFTP exported directory of your development workstation.
```
=> setenv fdt_file <device-tree-file>.dtb
```
(Optional) Use a comma-separated list to specify the device tree overlay (*.dtbo) files you want to apply. These are the names of the *.dtbo files you copied to the TFTP exported directory of your development workstation.
```
=> setenv overlays <overlay1>.dtbo,<overlay2>.dtbo
```
Establish the kernel file (*.bin) name. This is the name of the *.bin file you copied to the TFTP exported directory of your development workstation.
```
=> setenv imagegz <kernel-file>.bin
```
Save the changes.
```
=> saveenv
```
Boot from TFTP.
```
=> dboot linux tftp
```
You can make these changes persistent by writing the following command:

=> setenv bootcmd 'dboot linux tftp' => saveenv

The target now loads the kernel and device tree from the TFTP server and the root file system from the NFS server.

Boot entirely from NFS

To avoid using TFTP for kernel and device tree files and boot everything from NFS, copy the kernel *.bin and device tree *.dtb files to the NFS-exported directory of your development workstation (instead of to the TFTP directory). See Set up an NFS server.

=> dboot linux nfs

Boot from microSD card

U-Boot can start a complete Digi Embedded Yocto system from a microSD card. See Boot from microSD card for instructions on creating a bootable microSD card and booting from it.