[PCIe/USB3.0 Port] usb_pcie_switch_mode does not exist

VIM3
1

Hi all,

I set up a Khadas VIM3 board with the newest kernel image (5.16.0-rc2).

The system has been installed (successfully) on the eMMC.

I want to use the PCIe port (instead of the USB 3.0). To do so, I am follow this guide:

But on my board, the /sys/class/mcu/usb_pcie_switch_mode file does not exist.

How can I switch from using the USB 3.0 to the PCIe port?

Thank you for your time and help in advance :slight_smile:
Arthur

2

Hey there,
if you are having issues with switching the usb/PCIe mux, you can try switching the port using kbi
you can do so with the recovery system called krescue

hope it helps,
cheers

3

Hey,

general question. Does this file not exist for all the mainline kernels and if it does not is Krescue the intended way to switch or are there other options?

Bruno

4

Use the minicom terminal option on the host (ubuntu box), use a CP2102 USB adapter and set the dip switches for TTL. You need 3 dupont wires with females on both ends to connect to GPIO pins.

FYI, if you use a CP2102 on a windows box you MUST install the correct driver that comes directly from their website or it will not work properly. No special driver is needed on Ubuntu 20 & 21

Instructions in the VIM manual are correct for the minicom setup.

5

@brunovollmer You can use i2c command

Set to PCIe

$ i2cset -f -y 4 0x18 0x33 0x1

Check

$ i2cget -f -y 4 0x18 0x33

0 is USB3.0, 1 is PCIe

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