i.MX ProcessorsのトピックRe: Not Getting USB Device during Boot

Not Getting USB Device during Boot

VDevrari — Sat, 20 Jun 2026 11:29:20 GMT

I have IMX8M Plus Processor. I have set the Boot configuration as 0001 to download the firmware from USB.
This is a custom Board that we are powering up first time.

This is the log from uuu tool.

PS C:\NXP\UUU> .\uuu.exe -lsusb
uuu (Universal Update Utility) for nxp imx chips -- libuuu_1.5.243-0-g230f1b1

Connected Known USB Devices
Path Chip Pro Vid Pid BcdVersion Serial_no
====================================================================

Also we are unable to connect the JTAG
the TDO Pin is continuous High.
@support @ritesh

Re: Not Getting USB Device during Boot

Zhiming_Liu — Tue, 23 Jun 2026 00:26:11 GMT

Hi,

uuu -lsusb shows no “Known USB Device,” indicating that the i.MX8M Plus has not successfully entered ROM Serial Downloader or USB SDP mode, or that the USB OTG device has not been properly enumerated by the PC.

Combined with the inability to connect via JTAG and the TDO signal remaining high, this appears to be an early-stage board-level bring-up issue: the SoC may not have released the reset properly, there may be abnormalities in critical power supplies or clocks, the boot mode strap may not have been sampled correctly, or there may be issues with the connections or power supply to the JTAG/USB-related pins.

Best Regards,
Zhiming

Re: Not Getting USB Device during Boot

VDevrari — Tue, 23 Jun 2026 04:14:15 GMT

The issue is resolved.

I found that VDD_PLL_ANA_1V8 Net was not powered up.

Thanks @Zhiming_Liu for your response.