Example USB ports¶

Objective¶

The goal of this wiki page is to verify that the USB ports on the Devkit are working. There are several USB ports.

• There are 4 USB-2.0 ports
• There is one USB-3.0 port with a USB-C connector.

Prerequisites¶

• This test verifies the ports by using a USB-stick and a USB-3.0 SSD drive with a USB-C interface

Steps¶

USB-2.0 Ports¶

• List the usb devices when nothing is plugged in.
  

  root@mitysom-am57x:~# lsusb
  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 001 Device 002: ID 0451:8142 Texas Instruments, Inc. TUSB8041 4-Port Hub
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  root@mitysom-am57x:~#
  

• Plug a USB-stick into one of the 4 USB-2.0 ports. Use lsusb to verify that an additional device is now present.
  

  root@mitysom-am57x:~# lsusb
  Bus 001 Device 006: ID 058f:6387 Alcor Micro Corp. Flash Drive
  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 001 Device 002: ID 0451:8142 Texas Instruments, Inc. TUSB8041 4-Port Hub
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  root@mitysom-am57x:~#
  

• for a USB stick, you can list the files on the drive by using the following command:
  

  ls /run/media/sda1
  

• Before removing the USB stick you should do the following:
  

  eject /dev/sda1
  

• After doing the eject, you can remove the USB stick and insert it into another port.
  • The lsusb will list the USB stick with a different Device
  • The file system will likely be mounted on the same /dev/sda1 and be available at /run/media/sda1
  • Again, do an eject /dev/sda1 before removing the USB stick.
• You can try each port to verify that the USB stick is usable regardless of which port is used.

USB-3.0 Port¶

• Plug in a SSD drive using a USB-C cable.
• Use lsusb to verify the drive is present
  

  root@mitysom-am57x:~# lsusb
  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 004 Device 002: ID 0781:5595 SanDisk Corp.
  Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 001 Device 002: ID 0451:8142 Texas Instruments, Inc. TUSB8041 4-Port Hub
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  root@mitysom-am57x:~#
  

  
  Note the SanDisk line for Bus 004 Device 002.

• Use lsusb -t to see what speeds are supported.
  

  root@mitysom-am57x:~# lsusb -t
  /:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
      |__ Port 1: Dev 2, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
  /:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
  /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
  /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
      |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
  root@mitysom-am57x:~#
  

  
  Note that the second line indicates the Mass Storage device supports a speed of 5000M. This is what is expected of a USB 3.0 SuperSpeed device. 480M indicates the device only supports USB 2.0 speeds.
• The disk should be mounted at something like /run/media/sda1
• Before removing the USB stick you should do the following:
  

  eject /dev/sda1
  

• The USB-C port can look like a USB peripheral to another host in addition to having devices like a disk plugged into it.
  • See the RNDIS wiki page for an example of this. Example_RNDIS

See the Software FAQ for usb 3.0 nvme benchmark speeds

Conclusion¶

The steps needed to verify the USB-2.0 and USB-3.0 ports have been described.