Using Zephyr for third party custom Microcontroller[SoC not supported by zephyr]

[Vid609]

Hello zephyr community,

I am trying to add the Zephyr ecosystem to a third party board which is not previously supported by Zephyr. The board is a Cortex M0 chipset. The architecture is supported but the SoC is not supported. I have added the board(used plank as a board here for e.g) files as below .

ncs/v2.1.1/zephyr/boards/arm$ tree plank_control_box/
plank_control_box/
├── Kconfig.board
├── Kconfig.defconfig
├── plank_control_box.dts
├── plank_control_box.dtsi
├── plank_control_box.yaml
└── plank_control_box_defconfig

The tree structure for files modified in soc

├── plank
│   ├── CMakeLists.txt
│   ├── Kconfig.defconfig.plank
│   ├── Kconfig.defconfig.series
│   ├── Kconfig.series
│   ├── Kconfig.soc
│   ├── linker.ld
│   └── startup_plank.S
├── CMakeLists.txt
├── Kconfig
├── Kconfig.defconfig
└── Kconfig.soc

Yaml file added for serial driver in bindings : pl,plankcontrolbox-uart.yaml

Further .dtsi files been included in plank

ncs/v2.1.1/zephyr/dts/arm$ tree plank/
plank
├── plank.dtsi
└── plank.dtsi

We have added SoC Vendor hals to the drivers directory and written driver api for uart.

We tried using sample program zephyr/samples/hello_word/ but we are unable to get any output.

Could you please help us with any information to make progress.

Thanks