Additional Information - Congatec conga-QMX8-X Quick Start Manual

The following environment variables are predefined for conga-QMX8-X
(Revision Y.1):
Name Default value Description
bootcmd Defines the startup command of the bootloader, i.e.
how the system performs the boot process
fdt_file imx8qxp-cgtqx8x.dtb The device tree blob, might be exchanged in order to
enhance functionality
image Image The name of the kernel image file that is loaded
during boot process
ipaddr not specified Address of the system (used for network boot)
serverip not specified Address of the remote host (used for network boot)
netmask not specified Netmask of the network (used for network boot)
nfsroot not specified The location where the NFS root filesystem is stored
(used for network boot)
mmcdev "1" (onboard microSD card) The boot device number (used for mmcboot)
mmcpart "1" (first partition) The number of the bootpartiton on the bootdevice
(used for mmcboot)
mmcroot "/dev/mmcblk1p2 rootwait The root filesystem (used for mmcboot), might also
rw" (2nd partition on device 1) be used to extend the kernel command line
Following, some frequently used scripts:
Name Description
mmcboot Boots the system from mmc (with the specified parameters for mmcboot), i.e.
eMMC, SD card, microSD card
mmcargs Configures the bootargs for mmcboot
netboot Boots the system from network (with the specified parameters for network boot)
netargs Configures the bootargs for network boot
loadbootscript Used during boot, loads an eventually existing boot script
loadimage Used during boot, loads the kernel
loadfdt Used during boot, loads the device tree blob file
There are several commands to change the behavior of the bootloader and
to customize the boot process. The help command can be used to display
a list of all available commands.
Copyright © 2019 congatec AG
2.4 Linux
By default, the bootloader loads the Linux operating system stored on the
microSD card. The operating system image is built by Yocto.
Booting to the Linux desktop may take some time. To speed up the boot
process significantly, install the root filesystem onto the onboard eMMC
device.
Note
In order to maintain the integrity of the file system, it is recommended to
always shut down the system by issuing the command "poweroff" in the
console terminal.
2.5

Additional Information

The software provided on the included microSD card is based on the Yocto
Project (www.yoctoproject.org) and i.MX 8QuadXPlus specific add-on layers
provided by NXP and congatec.
The conga-QMX8-X software documentation is available at:
https://wiki.congatec.com
The conga-QMX8-X sources required to build the root filesystem image,
kernel and bootloader are available at:
https://git.congatec.com/imx8x_early_access
Caution
Using the wrong source can cause damage to the hardware and/or loss of
data. For the conga-QMX8-X Revision Y.1, only use sources from branches
ending with "_cgtqx8x-Y1".
Note
Contact congatec technical support to get access to the sources on git.
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