KL730 EVM USB Detection Issue on Ubuntu 18.04 – Fastboot/DFUT Connection Failure

vijith@atlantasys.com

Dear Team,

We are currently working with the KL730 EVM Board to deploy and test AI models using Kneron PLUS/DFUT. However, our Ubuntu host PC is not detecting the KL730 board through USB, As a result, we are unable to establish USB communication with the board, which is required for firmware updates and AI model deployment.

1. Hardware & Software Setup

• Board: KL730 EVM
• Host OS: Ubuntu 18.04.6 LTS
• SDK: KL730 SDK 2.0.0
• USB: USB 2.0
• UART: /dev/ttyUSB0 (115200 baud) – Working
• Firmware: Leipzig v1.5.3
• Tools: Fastboot, Minicom, Kneron DFUT

2. Issue & Errors

A. USB Fastboot from Ubuntu:

fastboot --page-size 512 boot signed_4k_bl2_dq_swap_0_standard.bin

Output:

< waiting for any device >

B. USB Fastboot from U-Boot (UART):

setenv fastboot_bootcmd 'echo ok';fastboot -l 0xA00000 usb 1

Output:

No USB device found
USB init failed: -19

3. Troubleshooting Performed

We followed the official KL730 Development Environment User Guide and EVM Board User Manual:

• Configured USB 2.0 OTG mode (USBID_SEL1: OPEN, J65: pins 1–2 shorted).
• Configured SW1 for USB 2.0 Fastboot (SEL[5:3] = 000).
• Verified that Fastboot is installed on Ubuntu.
• Successfully booted the board through SPI NAND and accessed U-Boot via UART.
• Confirmed BL2, BL31, U-Boot, and Linux are loading successfully.
• Verified that the required firmware files, including fw_plus_nand_4k.ubifs, are available in SDK 2.0.0.

Despite these checks, USB communication is still not working.

4. Support Required

Could you please help us clarify the following?

1. USB Drivers: Does Ubuntu 18.04 require any additional USB drivers, kernel modules, or udev rules for KL730 detection?
2. USB Error: What causes USB init failed: -19, and how can we resolve it?
3. Firmware: Is Leipzig v1.5.3 compatible with Kneron PLUS/DFUT? Do we need to flash fw_plus_nand_4k.ubifs or update other firmware components?

Kindly provide the recommended step-by-step procedure to resolve USB detection, install any required drivers, and prepare the KL730 EVM for AI model deployment.

Thank you for your support.

Ethon Lin

Hello,

We checked your status and found out 2 issues:

1. USB port: To execute the PLUS flow, you need to connect the port USB3 on the EVM Board instead.

2. Firmware version: The firmware version in your EVM board is a previous version, please update it before running PLUS development. You can update it via SD or other programming methods.

Please try to resolve these 2 items and connect the USB again.