[BUG] PlutoSDR mode: USB gadget not enumerating with adalm-pluto firmware

[arcps2024]

Environment

• SignalSDR Pro hardware
• Raspberry Pi 5 host
• Firmware: adalm-pluto from https://github.com/signalens/signalsdrpro/tree/main/bin/adalm-pluto

Problem

Device boots to U-Boot prompt SIGNALSDR> but does not auto-boot Linux. When manually examining SD card from U-Boot, files are present but Linux does not start automatically.

Even when Linux boots (tested with tezuka_fw), the USB gadget network interface (eth1) never appears on the host.

Steps to Reproduce

1. Format SD card as FAT32
2. Copy adalm-pluto firmware files (BOOT.bin, devicetree.dtb, uEnv.txt, uImage, uramdisk.image.gz)
3. Set boot jumper to LEFT (SD card boot)
4. Connect USB-C (power/console) + Micro USB port 2 (data)
5. Power on

Expected

• Device auto-boots to Linux
• USB gadget creates eth1 network interface on host
• Device responds at 192.168.2.1

Actual

• Device stops at U-Boot SIGNALSDR> prompt
• No USB gadget enumeration from Micro USB port 2
• No eth1 interface created

Serial Console Output

SIGNALSDR> ls mmc 0
            system volume information/
  2544076   boot.bin 
    24036   devicetree.dtb 
     7061   uenv.txt 
  4596960   uimage 
  5760674   uramdisk.image.gz 

Related

• Issue How can community help #18 mentions Ethernet not supported
• Is USB gadget mode supposed to work with this firmware?

Question

What is the correct procedure to get PlutoSDR/libiio mode working with USB data transfer?

[arcps2024]

Additional Testing Results

Test 1: Manual Boot from U-Boot

After importing uEnv.txt and running sdboot:

• Kernel loads and starts: Starting kernel ...
• Console output stops immediately after kernel handoff
• No USB gadget appears on host

USB Port Testing

Both micro USB ports enumerate as serial chips, not USB gadget:

• Bottom Micro USB: FT232H (ttyUSB2) - serial only
• Top Micro USB: Nothing enumerates

Neither port creates a USB gadget (RNDIS/CDC-ECM network device).

Ethernet Testing

• Physical link up at 1Gbps
• No response to ping on 192.168.2.1 or any IP in 192.168.2.x range
• Device doesn't appear to have network stack running

Serial Console

All three serial ports (CP2105 ttyUSB0/1, FT232H ttyUSB2) show no output after kernel starts.

Conclusion

The adalm-pluto firmware boots but the Linux system doesn't initialize properly:

1. USB gadget driver not working
2. Network stack not running
3. Console not accessible after boot

Is there a different firmware version or configuration required for SignalSDR Pro hardware?

[xwings]

updated documents,

https://github.com/signalens/signalsdrpro/blob/main/transform.md

can you check what is missing ?