I have MYD-YA157C-V3 Development Board with MYC-YA157C-V3-4E-512D-65-I SOM module.

I want to create an embedded linux application which uses Modbus RS485, Modbus TCP, MQTT etc. . I have started to get familiar with modbus on WSL with USB-RS485 adapter, but I want to implement (in C or C++) this on the above mentioned development board. There is a factory linux on the board but there are a lot of applications which I don’t use. The used space in flash is already 96%, and there is no gcc on the board…

I think I need to create an own linux kernel and operation system (with Yocto) and cross compile my application to it, but I don’t know how to get started.

Have anyone already used this board, and can explain me how to make my project?

Some more information about current linux OS on the board ( cat /etc/os-release ):

ID=”openstlinux-eglfs”

NAME=”ST OpenSTLinux – EGLfs – (A Yocto Project Based Distro)”

VERSION=”3.1-snapshot-20211108 (dunfell)”

VERSION_ID=”3.1-snapshot-20211108″

PRETTY_NAME=”ST OpenSTLinux – EGLfs – (A Yocto Project Based Distro) 3.1-snapshot-20211108 (dunfell)”

Thank you.