How to compile the device tree with the Developer Package

1. Purpose

This article explains how to compile a devicetree in a Windows^® environment, and how to deploy the compiled devicetree.

2. Rationale

By using cubeMX or for any reason, a new device could be needed and should be flashed on running software.

3. Pre-requisites

1. Install a cross-compiler
   • A cross compiler is needed to parse/prepare the dts file.

     System Workbench for STM32 is a good candidate

     The zip file with the gcc could be find in C:\Ac6\SystemWorkbench\plugins\fr.ac6.mcu.externaltools.arm-none.win32_1.16.0.201807130628\tools

     mingw64 is also is good alternative

2. Install a devicetree compiler
   • Install the dtc.exe and mkimage.exe from the zip file dt4win-0.2.0.zip

6. updating devicetree of Kernel

1. Get the source code of Linux
2. Apply patch on the source code of Linux
3. Create a workdir directory

   mkdir workdir

4. Copy from source code of Linux the dt-bindings and dt files

   cp <KernelSources>/include/dt-bindinds workdir

   cp <KernelSources>/arch/arm/boot/dts/* workdir/

5. Copy your dts into workdir

   cp <Your/dts/file.dts> workdir/

6. Prepare dts

   cd workdir

   arm-none-eabi-gcc.exe -E -nostdinc -I . -undef -D__DTS__ -x assembler-with-cpp -o <yourDTS.dts>.tmp <yourDTS.dts>

7. compile dts.tmp with dtc.exe

   dtc.exe -I dts -O dtb -o <DTBresult.dtb> <yourDTS.dts>.tmp

Trusted firmware for Arm^® Cortex^®-A

Das U-Boot -- the universal boot loader (see U-Boot)

Linux^® is a registered trademark of Linus Torvalds.

Device tree source (in software context) or digital temperature sensor (in peripheral context)