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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-sAMX8 bootloader sources are derived work from a dedicated version of mainline U-Boot, e.g v2018.03. 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.
7.2. Bootloader Quickstart
The SMARC-sAMX8 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.MX8QM revB A53 at 1200 MHz at 18C
Model: Kontron SMARC-sAMX8 QuadMax
Board: Kontron sMX8 SMARC 2.0 Module
Boot: FLEXSPI
DRAM: 6 GiB
start sata init
TX PLL is not locked.
MMC:
FSL_SDHC: 0, FSL_SDHC: 1
Loading Environment from SPI Flash... SF: Detected mt35xu512g with page size 256 Bytes, erase size 128 KiB,
total 64 MiB
OK
TX PLL is not locked.
In:
serial
Out:
serial
Err:
serial
BuildInfo:
- SCFW f0226b37, SECO-FW 5ea79733, IMX-MKIMAGE 2cf091c0, ATF d6451cc
- U-Boot 2018.03-imx_v2018.03_4.14.78_1.0.0_ga+g7ade5b4
www.kontron.com
Kontron SMARC-sAMX8 - Rev. 1.2
// 48
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