PCIe/USB3.0 Port

Khadas VIM3 contains a 2:1 data switch chipset to switch the “combo interface” between PCIe and USB 3.0, and the default mode is USB 3.0.
You can refer the block below for further details:

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

The default mode is USB-3.0.

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

Poweroff the system to bring changes into effect:

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kvim3#kbi poweroff 
do_kbi_poweroff

Then press the POWER KEY to boot the system.

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

  • Check current port mode:
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khadas@Khadas:~$ cat /sys/class/mcu/usb_pcie_switch_mode
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0 - USB 3.0 mode
1 - PCIe mode

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

Poweroff the system to bring changes into effect:

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

Then press the POWER KEY to boot the system.

See Also

KBI Guide