AM3352: rootfs Boot USB hotplug Issue

Hi Vic,

Which SDK version do you use on AM3352?

Please describe how you use the USB hotplug?

Dear Bin 

I am using TI Kernel version 6.6, with Rootfs as Artix Linux. When I plug in a USB Disk, there is no response from the USB hotplug.

The udev-init-scripts and eudev are confirmed to be installed and running.

Here is a screenshot of the USB hotplug execution during boot (not an operation):

Hi Vic,

First of all, the latest SDK for AM335x has kernel v6.1, not v6.6 yet. But this is not important, the mainline kernel (v6.6) should work on AM335x in terms of USB functions.

Vic Chang said:

When I plug in a USB Disk, there is no response from the USB hotplug

When the USB disk is plugged, does Linux console print any other kernel message?

Dear Bin

The dmesg message after using the USB Disk is:

Please use a scope to probe the USBx_DRVVBUS, USBx_VBUS, USBx_DP and USBx_DM signals near AM335x when the USB device is plugged in.

Dear Bin

OK, I understand.

I will provide my USBx_DRVVBUS DTS settings.

The kernel message you provided above seems indicating the USB signals are not correct. So a waveform of the 4 USB signals during the USB device attach likely will give a hint about the problem.

Dear Bin

OK, I will ask the relevant circuit design colleagues to conduct verification.

Currently, it is already in the PCBA stage.

This will take some time.