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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 mainline U-Boot and authors of the source can be obtained from the git repository at
git://git.denx.de/u-boot.git
SMARC-sAMX8X 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 SMARC-
sAMX8X: https://github.com/kontron/u-boot-smarc-sAMX8X
7.2. Bootloader Quickstart
The SMARC-sAMX8X 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 Kontron SMARC 2.0 carrier 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
.
U-Boot <Version> (<Date-code>)
CPU: Freescale i.MX8XD rev1.2 at 996MHz
CPU: Extended Commercial temperature grade (-20C to 105C) at 54C
Reset cause: POR
Board: Kontron SMX8X SMARC 2.0 Module
I2C: ready
DRAM: 2 GiB
MMC: FSL_SDHC: 0, FSL_SDHC: 1
SF: Detected w25q16dw with page size 256 Bytes, erase size 4 KiB, total 2 MiB
In: serial
Out: serial
Err: serial
Net: FEC0, FEC1
Hit any key to stop autoboot: 0
=>
www.kontron.com
SMARC-sAMX8X User Guide. Rev. 1.1
// 38
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