ClearFog GTR L8 Quick Start Guide


Revision and Notes






The following quick start guide provides background information about the ClearFog GTR L8 product.

The guide will give a technical overview about the product and by the end of it you should be able to boot an operating system and begin testing your application.



1 x USB 3.0


8 x 1GbE switched LAN supporting 802.3at/af/bt* (up to type 4) PSE PoE
1 x 1GbE WAN supporting up to 802.3bt type 4 PD PoE
1 x SFP (up to 2.5GbE)


Marvell ARMADA based A385 Dual core Arm Cortex A9 up to 1.3 GHz

Memory & Storage

Up to 2GB DDR3
2 x 7 pin SATA




GPIO header
Indication LEDs
User Push Buttons

Development and Debug interfaces

Micro USB


10V – 54V when not enabling PoE PSE *
48V – 54V when enabling PoE PSE *

Expansion card I/Os

3 x mPCIe (1 x mPCIe supports LTE with SIM holder)


Industrial: -40°C to 85°C


PCBA: 238 x 130mm
Enclosure : 253 x 132 x 32mm


Extruded aluminum


(*) 802.3bt supported only on 4 x RJ45 ports (90W each), 802.3at/af is supported on all 8 ports (30W each).

Block Diagram

The following figure describes the ClearFog GTR L8 Block Diagram.

Visual features overview

Please see below the features overview of the connector side of the ClearFog GTR L8.


Print side connector overview of the ClearFog GTR L8.

Software Setup

Cable setup and prerequisites

Here is what you will need to power up the board:

  • Linux or Windows PC

  • ClearFog GTR L8

  • 48V Power Supply (ClearFog GTR L8 has wide range input of 10V-54V, it is recommended to use 48V)

  • Micro USB to USB for console, the ClearFog Pro has an onboard FTDI chip.

  • IP router or IP switch

The ClearFog GTR L8 has a wide range of 10V-54V input power supplies:

  • 10V – 54V when not enabling PoE PSE

  • 48V – 54V when enabling PoE PSE

The following is a list of industry-standard cables, sorted by type, with the necessary compliance requirements that have been proven to work well with the ClearFog product family (ClearFog Base / Pro).

These examples are the cables which SolidRun uses for testing, and should provide enough information to source products from your preferred cable vendor.

  • Ethernet cable: Monoprice 24AWG Cat6A 500MHz STP

  • USB Cable: SuperSpeed USB 3.0 Type A Male to Female Extension Cable in Black

  • SFP connector: GigaLite GE-GB-P1RT-E SFP module with Monoprice 24AWG Cat6A 500MHz STP cable

Boot Select

Before powering up the board for the first time it is recommended to select the boot media. In order to configure the boot media, please refer to ClearFog GTR Boot Select .

Booting from an eMMC card

The switches on the boot source selector must be set as follows:

Switch 1

Switch 2

Switch 3

Switch 4

Switch 5






The following shows how to set the switches on the boot source selector:

The ClearFog GTR including U-Boot into eMMC by default.

Note: Here can find the U-Boot Binaries - SolidRun Images

Once you set the switches, you can apply the following for booting from an eMMC card.

1. Downloading the Debian image

1 wget

2. Writing the image to the USB Disk card

Use the following commands for writing the image to an USB Disk:

1 xz -dc sr-a38x-debian-buster-20200114.img.xz | dd of=/dev/sdX bs=4k conv=fdatasync

Note: Plug a USB Disk into your Linux PC, the following assumes that the USB is added as /dev/sdX and all it’s partitions are unmounted.

3. USB Disk insertion

Please Insert the USB Disk into your device.

4. Power connection

Connect your power adapter to the DC jack, and then connect the adapter to mains supply.

5. Serial Connection

Please insert the micro USB into your device, then you can refer to Serial Connection for installing necessary serial connection software in Linux/Windows.

Once you installed the necessary serial connection software, you should be able to see the following:

  • In order to be able to log in , please insert “debian” as a username and password as follows:

SFP Modules

For some SFP modules that work on SolidRun networking hardware platforms, please refer to SFP Modules .

SIM Card Slot

It is possible to utilize a Cellular connection by inserting a SIM card into the SIM card slot. Please observe that a GSM Cellular modem needs to be installed utilizing the mini PCIe connection in order to exploit the cellular connection.

List Of Supported OS





A38X Buildroot




Build U-Boot & kernel from sources