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Kontron K393-Nx

Board Identification

Identifier: K393-Nx

Yocto MACHINE: k393x-mini-x86

Documentation:

Features:

  • CPU: : Intel Processor N50
  • RAM: DDR5 4800 SDRAM (1x SO DIMM socket)
  • Storage: 1x SATA + 3x M.2 PCIe
  • AMI BIOS Aptio 5.x
  • 2x RJ45 Ethernet
  • 5x USB ports
  • Video & sound:
    • Intel UHD Gen12 Gfx
    • DisplayPort
    • Stereo Audio
  • 8-34V DC-In Power
  • 1x RS232,422,485 - 8 Bit GPIO

Boot Sequence

  • The UEFI loads the Comboapp and starts the Kernel
  • The kernel mounts the initial ram file system (initramfs) and starts Init
  • The Init check the UEFI environment and synchronize the UEFI variables with Bootflags (A reboot may occurr in this step to update the UEFI environment)
  • The Init mount the active partitions and runs the init system (systemd)

First Installation

  1. On your PC:
    • Install the .wic file in the boot device/disk 
      WELMADEV=/dev/sdb
WICIMG=tmp/deploy/images/$MACHINE/welma-image-minimal-dev-$MACHINE.wic
zstd -f -d $WICIMG.zst
sudo dd if="$WICIMG" of="$WELMADEV" bs=1M
    • Plug the peripheral into the target machine

Warning

Make sure that the WELMADEV variable is correct before running the commands, dd will irreversibly override the targeted device and any data it contains.

  1. On the target machine:

    • Power on the target machine
    • Enter the UEFI menu

    • In the Save & Exit menu, select the first partition of your disk (usually displayed with the manufacturer's name). As in the following image:

    • The UEFI will load and execute the selected boot entry

    • Welma checks the UEFI environment at each boot, in the case of the first boot, the UEFI environment will be updated and the system will reboot.
    • After this boot, UEFI will launch the comboapp contained in the first partition of the Welma disk (the boot order has been updated).

Changing the boot device

It's always possible to start Welma from another device. To do this:

  1. Plug the new device into the target machine
  2. In the Save & Exit and select the first partition of the new disk as in the following image:
  3. Welma checks the UEFI environment at each boot, in the case of the first boot, the UEFI environment will be updated and the system will reboot

Appendix

Connections

  • Power and Serial ports

Hardware Watchdog

The K393-Nx machine uses the Intel iTCO hardware watchdog. To support this functionality, the system requires BIOS version 1.4.0 or later, as earlier versions do not properly expose the iTCO watchdog interface to the operating system.

The BIOS versions can be found here: FTP-Link: BIOS & BIOS-Release Notes K393x-N