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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 pITX-iMX8M u-boot can be obtained from the git repository at
https://gitlab.kontron.com/imx/u-boot-imx
PITX-iMX8M bootloader sources are derived work from a dedicated version of NXP development branch which is
hosted at source.codeaurora.org
https://source.codeaurora.org/external/imx/uboot-imx.git
NXP work itself is based on mainline u-boot versions as hosted at denx:
git://git.denx.de/u-boot.git
As a result, any bootloader for the pITX-iMX8M is based on a mainline u-boot version (e.g. v2020.04) and a branch in
NXP's uboot-imx.git repository (e.g. imx_v2020.04_5.4.24_2.1.0) hosted at codeaurora.org.
7.2. Bootloader Quickstart
The PITX-iMX8M board comes with U-Boot preinstalled on the eMMC device. Follow the steps below to gain access
to the bootloader command line (CLI) on your host PC.
Connect your host machine to the modules serial connector J19 using a flat ribbon DB9 adapter cable.
Set the i.MX8M boot mode using the Boot Select DIP Switch SW1[1:2] to [Off:On] to select internal boot mode.
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 pITX-iMX8M 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.
www.kontron.com
pITX-iMX8M – Rev. 1.1
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