Linux 4.14, Myon II

http://gitlab.keith-koep.com/imx/linux-imx

The Myon II is software-compatible with the Trizeps VIII Mini module.
Because Trizeps VIII, Trizeps VIII Mini, and Myon II share the same kernel source code, you may a look at Linux 4.14, Trizeps VIII (-/Mini/Nano) for instructions on how to build and deploy an image. The only difference is the Device-Tree-Binary (.dtb) file passed to the kernel on boot.

How to Build Linux Kernel for Myon II

This is only a quick-reference on how to build a Linux Kernel including Seco specific changes.
For details please view the Linux and NXP i.MX8M documentation.

Get the source code of linux-imx from the git repository:

Setup Cross-Build environment (View Software-Development-Kit on how to install.):

Build Linux-Kernel from source code:

This will generate linux kernel ('Image') and device-tree binary ('*.dtb') files.

After you generated the kernel, you might want to build the kernel-modules:

Note: When the kernel boots it loads kernel-modules from the root-filesystem at '/lib/modules/<kernel-build-number>' (i.e. /lib/modules/4.14.78-imx_4.14.78_1.0.0_ga+g66620c3). The kernel-build-number is derived from git.

Update Kernel

Updating the kernel involves to copy 'Image' and the kernel-module directory to the device.
If the kernel-build-version did not change, copy of the kernel-module directory can be omitted.

Update using USB and bootloader

Enter the bootloader command console and run:

This will configure the USB-OTG port to emulate a USB-Mass-Storage device.
Example:

After calling 'ums 0 mmc 0' a new device 'sdf' appears in the list of mounted devices.

Copy the kernel-'Image' and device-tree binary files to the first partition.

Copy the kernel-modules-directory to the second partition, which contains the root-filesystem.

Hints on using the Kernel

Device Tree

The Linux-kernel will use a Device-Tree-Binary file (.dtb) to determine how the Myon module is used in a system (i.e. which drivers to load). The device-tree files can be found at:

When building the Linux-kernel .dts source-files are converted to .dtb binary files.

When you open the u-boot command prompt and output the environment, you can determine which device-tree is used:

To change this you can call:

'env save' will store this setting for subsequent boots.

Root-Filesystem

To have a full running Linux-system you will need:

• Bootloader ( U-Boot, Myon II ), which loads the Device-Tree and Linux-Kernel.

• Linux Kernel

• Root-Filesystem, which contains applications, configuration files etc.

There are different approaches on how to create a root-filesystem.
Basicly its a linux-distribution like Debian, where the system is put together by packages or like Yocto, where recipes define what needs to be built and put inside the file-system:

• debiant8

• Android 9, Trizeps VIII Mini