The ConnectCore 6UL platform uses U-Boot (Universal Bootloader) as primary bootloader. U-Boot is an open-source project. You can find standard documentation about commands, environment variables, Flattened Device Tree support, and more at www.denx.de/wiki/U-Boot/Documentation.

About this guide

This guide only describes specific changes made to the standard U-Boot by Digi International.

Version

U-Boot for ConnectCore 6UL is based on standard U-Boot v2017.03 plus NXP patches at https://github.com/nxp-imx/uboot-imx.

Supported interfaces

The U-Boot for ConnectCore 6UL supports the following interfaces:

  • UART5 for console (115200/8/N/1)

  • DDR3L

  • NAND

  • microSD card

  • 10/100Mbps Ethernet on SMSC LAN8720 PHY (RMII)

  • I2C multi-port

  • One-Time-Programmable (OTP) bits

Carrier board version and ID

Digi uses non-volatile media to store the carrier board version and ID. See Carrier board version and ID.