How To Setup PCIe/USB3.0 Port

Khadas VIM3 contains a data switch to switch the “combo interface” between PCIe and USB 3.0. The default mode is USB 3.0.
You can find the block below.

VIM3 PCIe/USB3.0 Block

There are three ways to setup the PCIe/USB3.0 port:

  • Setup the port using the KBI
  • Setup the port using the Android UI
  • Setup the port using the Android/Ubuntu command line

Setup the PCIe/USB3.0 port using the KBI

You need to setup the serial debug tool and enter the u-boot command line.

  • Initialize the KBI:
kvim3#kbi init
  • Check current port mode:
kvim3#kbi portmode r
port mode is USB3.0

The default mode is USB-3.0.

  • Change mode to PCIe:
kvim3#kbi portmode  w 1
set port mode to :PCIE
  • Change mode to USB 3.0:
kvim3#kbi portmode w 0
set port mode to :USB3.0

Poweroff the system to bring changes into effect:

kvim3#kbi poweroff 
do_kbi_poweroff

Then press the POWER KEY to boot the system.

Setup the PCIe/USB3.0 port using the Android UI

You’ll need to navigate to “Device Preferences” using an IR remote, mouse or attached keyboard.

Android Device Preferences
Mode Switch UI

Reboot the system to bring changes into effect.

Setup the PCIe/USB3.0 port using the Android/Ubuntu command line

  • Check current port mode:
khadas@Khadas:~$ cat /sys/class/mcu/usb_pcie_switch_mode
1

0 - USB 3.0 mode
1 - PCIe mode

  • Change mode to USB 3.0:
khadas@Khadas:~$ echo 0 > /sys/class/mcu/usb_pcie_switch_mode
  • Change mode to PCIe:
khadas@Khadas:~$ echo 1 > /sys/class/mcu/usb_pcie_switch_mode

Poweroff the system to bring changes into effect:

khadas@Khadas:~$ echo 1 > /sys/class/mcu/poweroff

Then press the POWER KEY to boot the system.

See Also

KBI Guide