====== VIM3/VIM3L USB3/PCIe Switch ======

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''.

===== Switch port mode using KBI =====

You need to setup the [[ products:sbc:common:development:setup-serial-tool| serial debug tool ]] and enter the u-boot command line.

Initialize the KBI:

```shell
kvim3#kbi init
```

Check current port mode:

```shell
kvim3#kbi portmode r
port mode is USB3.0
```
The default mode is USB-3.0.

Change mode to PCIe:
```shell
kvim3#kbi portmode  w 1
set port mode to :PCIE
```

Change mode to USB 3.0:
```shell
kvim3#kbi portmode w 0
set port mode to :USB3.0
```

Poweroff the system to bring changes into effect:
```shell
kvim3#kbi poweroff 
do_kbi_poweroff
```

Then press the ''POWER KEY'' to boot the system

===== Switch port mode using linux =====

Check current port mode:
```shell
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:
```shell
khadas@Khadas:~$ echo 0 > /sys/class/mcu/usb_pcie_switch_mode
```

Change mode to PCIe:
```shell
khadas@Khadas:~$ echo 1 > /sys/class/mcu/usb_pcie_switch_mode
```shell

Poweroff the system to bring changes into effect:

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

Then press the ''POWER KEY'' to boot the system.