We are using the Apalis module on a custom carrier board and are facing an issue with the USB Host on the module. USBH3 and USBH4 are routed to connectors on the carrier and in around 90% of the occasions when I insert an USB-Stick the system restarts.
In U-Boot it only happens after I did a “usb start”. If I insert the stick before and do “usb start” afterwards I can read the stick just fine. Also if I insert the stick before powerup and boot into linux the stick can be read. If I insert afterwards a restarts happens.
There are no messages. I’ve checked VCC3.3 and there is no voltage drop. Also USBH_OC# is not activated. I’m looking for pointers how to debug this issue.