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# FAQs

How do you flash the configuration data table (CDT)?

CDT provides platform or device-dependent data such as platform ID, subtype, and version. Various software (drivers/firmware) modules can use this information to dynamically detect and initialize the platform.

Ensure that the device is in EDL mode. For more information, see Force device into emergency download mode.

Download the CDT binary.

Based on the required development kit, download the respective CDT from the Flash CDT table in the Release Notes.

mkdir <cdt_download_path>

cd <cdt_download_path>

wget https://artifacts.codelinaro.org/artifactory/codelinaro-le/Qualcomm_Linux/QCS6490/cdt/rb3gen2-vision-kit.zip
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Note

The download link provided is for the Vision Kit. For information on other development kit CDTs, see Release Notes.

unzip rb3gen2-vision-kit.zip

To flash the CDT, run the following commands:

cd <cdt_download_path>

<qdl_tool_path>/QDL_2.3.9_Linux_x64/qdl prog_firehose_ddr.elf rawprogram3.xml patch3.xml
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How do you provision universal flash storage (UFS)?

UFS provisioning helps divide the storage into several logical unit numbers (LUNs), allowing you to store different types of data separately. This improves access efficiency and system organization.

Note

To download the provision XML file and check the applicability of UFS provisioning for different SoCs, see the UFS Provisioning table in the Release Notes.
Ensure that the device is in EDL mode. For more information, see Force device into emergency download mode.

To download the provision file, do the following:

Based on the required SoC, download the respective provision from the UFS Provisioning table in the Release Notes.

mkdir <provision_download_path>

cd <provision_download_path>

wget https://artifacts.codelinaro.org/artifactory/codelinaro-le/Qualcomm_Linux/QCS6490/provision.zip
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unzip provision.zip

To provision UFS, run the following commands:

cd <provision_download_path>

<qdl_tool_path>/QDL_2.3.9_Linux_x64/qdl --storage ufs prog_firehose_ddr.elf <Provision file>
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Example

<qdl_tool_path>/QDL_2.3.9_Linux_x64/qdl --storage ufs prog_firehose_ddr.elf provision_1_2.xml

How do you update the USB and Ethernet controller firmware?

A firmware update to the USB controller may solve USB or Ethernet connectivity issues on the Dragonwing RB3 Gen 2 device.

Prerequisites

Ensure that you upgrade the software as described in Update the software before updating the Renesas firmware.
Ensure that you install the ADB tool. Fastboot comes installed along with it.
Connect the device to the Ubuntu host computer using a USB Type-C cable.

Procedure

Note

This procedure is applicable only to an Ubuntu 22.04 host computer. If you’re using a Windows or macOS host computer, set up an Ubuntu virtual machine by following the instructions described in the Virtual Machine Setup Guide.

To download the firmware, register and sign in to the Renesas website. After signing in, you can access the firmware from the following link.
To create the usb_fw.img image and copy the USB firmware, run the following commands on the Linux host computer:

dd if=/dev/zero of=usb_fw.img bs=4k count=240

mkfs -t ext4 usb_fw.img

mkdir usb_fw

sudo mount -o loop usb_fw.img usb_fw/

Note

Rename the downloaded firmware file as renesas_usb_fw.mem and then run the following commands.

sudo cp -rf renesas_usb_fw.mem usb_fw

sudo umount usb_fw

To start the device in Fastboot mode, run the following commands:

adb root

adb shell

reboot bootloader

When the device is in Fastboot mode, run the following command:

fastboot devices

Sample output

7dc85f5e fastboot

To flash the usb_fw.img image to the device, run the following commands:

fastboot erase usb_fw

fastboot flash usb_fw usb_fw.img

fastboot reboot

To confirm that the firmware update was successful, run the following command:

adb shell dmesg

Sample output

[ 6.589462] usbcore: registered new device driver onboard-usb-hub [ 6.653277] usb 2-1: new SuperSpeed USB device number 2 using xhci_hcd [ 7.013061] usb 2-1.1: new SuperSpeed USB device number 3 using xhci_hcd [ 7.120657] ax88179_178a 2-1.1:1.0 eth0: register ‘ax88179_178a’ at usb-0001:04:00.0-1.1, ASIX AX88179 USB 3.0 Gigabit Ethernet, 3e:9e:5e:ff:d3:fb [ 7.120767] usbcore: registered new interface driver ax88179_178a

To confirm that the firmware is available at the required location, run the following command:

#ls -la /var/usbfw

If you are unable to update the Renesas USB firmware with the preceding steps, do the following:

Rename the K2026090.mem file as renesas_usb_fw.mem.

Push the renesas_usb_fw.mem file to /var/usbfw.

For example, adb push renesas_usb_fw.mem /var/usbfw.

How do you install the Qualcomm USB driver (QUD) on the host computer?

Install QUD on the host computer to detect the Dragonwing RB3 Gen 2 device.

Note

For Ubuntu 22.04, you may face an issue while installing QUD. To ensure a successful installation, you may need to enroll the public key on your Linux host computer. For more details, follow the steps provided in the README file available in the /opt/QUIC/sign/signReadme.txt directory.

To clone the GitHub repository, run the following commands:

sudo apt install git

sudo git clone https://github.com/quic/quic-usb-drivers.git

cd quic-usb-drivers

To provide executable permissions to the file, run the following command:

sudo chmod +x QcDevDriver.sh

To install the QUD driver, run the following command:

sudo ./QcDevDriver.sh install

To detect the device, run the following command:

lsusb

Sample output

Bus 002 Device 099: ID 05c6:901d Qualcomm, Inc. QCM6490_e05d8b80

How do you install and connect the android debug bridge (ADB) on the host computer?

Some Qualcomm proprietary tools require an ADB. ADB is a command-line tool that allows communication with the Dragonwing RB3 Gen 2 device. The adb command facilitates various device actions, such as debugging, capturing kernel logs, and pushing applications and files to the device.

Install ADB

Install QUD.
Run the following command on the Linux host computer:

sudo apt install git android-tools-adb android-tools-fastboot wget

To verify the ADB version on the Linux host computer, run the following command:

adb --version

Sample output

Android Debug Bridge version 1.0.39 Version 1:8.1.0+r23-5ubuntu2

Connect to ADB

Side view of the Dragonwing RB3 Gen 2 Development Kit showing the USB Type-C port.

Figure: Location of the USB Type-C port

Using the USB Type-C cable, connect the Dragonwing RB3 Gen 2 device with the host computer. Ensure that the device displays as an ADB device.

adb devices

Sample output

List of devices attached 68f592a device

To enter the shell, run the following command:

adb shell

Sample output

How do you troubleshoot flashing-related issues?

Note

Ensure that the host computer isn’t running the ModemManager tool, as it interferes with QDL flashing.

If you’re using a Linux distribution with systemd, stop the ModemManager tool using the following command:

sudo systemctl stop ModemManager

If you need ModemManager, restart it after the flashing is complete.

If flashing fails, do the following and retry the flashing procedure:

Power off the device.
Disconnect the device from the host computer.
Restart the host computer.

How do you reconnect to a different network when you’re already connected to one?

To disconnect from the current network, run the following command:
nmcli c down QualcommWiFi
Connection ‘QualcommWiFi’ successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/1)
To verify the disconnect status, run the following command:
nmcli -p device
To connect to a different Wi-Fi network, run the following command:
nmcli dev wifi connect QualcommAP password XXXXXXXXX
Device ‘wlan0’ successfully activated with ‘6159ac7c-58c2-44fa-938f-45dcb544fac3’.

How do you set up debug UART using Minicom?

Minicom is a serial communication program that allows an admin user to interact with the Dragonwing RB3 Gen 2 device through the serial port.

To install Minicom on the Linux host computer, run the following commands:

sudo apt update

sudo apt install minicom

To verify the USB port, run the following command:

ls /dev/ttyUSB*

Sample output

/dev/ttyUSB0

To open Minicom, run the following command:

sudo minicom -s

Select the Down arrow key to select the Serial port setup option.

To set up the serial device configuration, do the following:
1. Select A on your keyboard to set up the serial device name such as /dev/ttyUSB0.
2. Select Enter to save the changes.
3. Select E on your keyboard to set the baud rate. If the baud rate isn’t set to 115200, select the E key again. Select Q on your keyboard to set the configuration to 8N1.
4. Select Enter to save the changes.
5. Select F on your keyboard to set the Hardware Flow Control to No.
  
  Note
  
  Ensure that the letters A, E, Q, and F are in uppercase.
6. Select Enter to save the changes.
Select the Save setup as dfl option and select Enter.

Select Exit to open the UART console.
Open the serial device and select ENTER to bring up the authentication prompt.
To sign in to the UART console, specify the following:

Sign in: root
Password: oelinux123

Note

If the authentication console doesn’t display as expected, verify the USB connection. If necessary, disconnect and then reconnect the Micro-USB cable.

How do you change the default root password?

By default, root users can sign in using the oelinux123 password.

Sign in as a root user.
To change the root password, run the following command:
```
passwd
```

Note

This command prompts you to enter a new password.

Sign out using the exit command.
Sign in as root using your new password.

How do you create a non-root user account?

Note

By default, you can sign in as the root user.

To create a non-root user account, run the following command in the shell.
```
adduser guest
```

Note

This command prompts you to enter a new password.

Sign out using the exit command.
Sign in to the shell using your new user account credentials.

## Further support Ask your questions on the [Qualcomm support forum](https://mysupport.qualcomm.com/supportforums/s/). Last Published: Jul 20, 2026 [Previous Topic Update the software](https://docs.qualcomm.com/bundle/publicresource/80-70030-251/topics/upgrade-rb3gen2-software.md) [Next Topic References](https://docs.qualcomm.com/bundle/publicresource/80-70030-251/topics/references.md)