ACPI, BIOS or other configuration for HSIC2?

allsey87 New Member Posts: 33
edited July 2020 in UP Core Carrier boards

Hi there, I have a custom PCB with the exact same circuit (a USB3503 hub) attached to HSIC1 as to HSIC2. The hub connected to HSIC1 is detected and I can connect devices to it without any problems. The hub connected to HSIC2 however is not detected. lsusb gives the following output with only one of the USB3503 hubs listed:

[email protected]:~# lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 0424:3503 Standard Microsystems Corp.
Bus 001 Device 002: ID 18a5:0302 Verbatim, Ltd Flash Drive
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

I have attached the schematics of my carrier board (carrier-board.pdf) if you would like to confirm that the two circuits are indeed the same.

Is there some custom configuration required to enable the second HSIC port? There is very little mentioned in the carrier board design guide and only HSIC1 is used in the UP-CRST01 carrier board.