7/ Bootloader Operation; Copyrights And Licensing Of U-Boot; Bootloader Quickstart - Kontron PITX-IMX8M User Manual

7/ Bootloader Operation

7.1. Copyrights and Licensing of U-Boot

U-Boot is free Software. It is copyrighted by Wolfgang Denk and many others who contributed code. U-Boot can be
redistributed and modified under the terms of version 2 of the GNU General Public (GPL V2) License as published by
the Free Software Foundation.
Actual source code of mainline U-Boot and authors of the source can be obtained from the git repository at
 https://kdp.kontron.local/git/pitx-imx8m-uboot/uboot_imx8m.git
PITX-iMX8M bootloader sources are derived work from a dedicated version of mainline U-Boot, e.g v2017.03. As
bootloader evolves, the root of the derived work might change to a later version.
The source code of U-Boot will be delivered with the standard software package.
Additionally the software can be downloaded from Kontron GitHub repository for PITX-
iMX8M: https://kdp.kontron.local/git/pitx-imx8m-uboot/uboot_imx8m.git

7.2. Bootloader Quickstart

The PITX-iMX8M board comes with U-Boot preinstalled on the QSPI flash device. Follow the steps below to gain
access to the bootloader command line (CLI) on your host PC.
 Connect your host machine to the carrier port connected with the edge connector SER0 port of the module.
On pITX-iMX8M this port is named SER_0.
 Start a suitable terminal program on your host and attach it to the port connected with the board's serial
interface. Configure the serial line using 115200 baud, 8 data bits, 1 stop bit, no parity.
 Connect power supply to the carrier and power up.
 When boot messages appear, press any key to stop automatic boot sequence.
After power on, bootloader boot messages will appear as shown below. There is a 3 second boot delay counter that
will try to boot linux OS automatically after expiration. Pressing any key will stop the boot delay counter and enter
the bootloader CLI.
pITX-iMX8M – Rev. 0.7 Preliminary
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