buildroot running on stm32mp157c-dk2

Env: Ubuntu 22.04 + kernel 5.15.43

Download

$ git clone https://github.com/bootlin/buildroot.git

STM32MP15x,MP13x

$ git clone https://github.com/bootlin/buildroot-external-st.git

$ cd buildroot/

$ $ make BR2_EXTERNAL=../buildroot-external-st st_stm32mp157c_dk2_defconfig 

Glibc

BR2_TOOLCHAIN_BUILDROOT=y
BR2_TOOLCHAIN_BUILDROOT_VENDOR="buildroot"
BR2_TOOLCHAIN_BUILDROOT_GLIBC=y
BR2_TOOLCHAIN_BUILDROOT_LIBC="glibc"
其它的用 menuconfig 選出來,在ToolChain裡

regarding the QT5 functions config such as qml, refer to it
qt5declarative //Qt Declarative提供了Qt QML和Qt Quick，用於QML開發UI


Compile

$ sudo make

rebuild package, rebuild kernel

$ sudo make  pacakge_name-rebuild

ex: after modifing source code from output/build/package_name
$ sudo make uboot-rebuild

if want to rebuild kernel, pkgname is linux.
$ sudo make linux-rebuild

modify Kernel config
$ sudo make linux-menuconfig

or

delete output/build/package_name
$ sudo make linux-dirclean
$ sudo make

Cross-compile for the applicant:

Use gcc 7.5 to compile, so install Docker of Ubuntu 18.04

Build QT5 basic library

BR2_TOOLCHAIN_BUILDROOT_CXX=y //kernel要選，才能選QT5相關config

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/ubuntu/STMicroelectronics/buildroot/output/target/usr/lib:/home/ubuntu/STMicroelectronics/buildroot/output/host/lib

export PATH=$PATH:/home/ubuntu/STMicroelectronics/buildroot/output/host/bin:/home/ubuntu/STMicroelectronics/buildroot/output/host/opt/ext-toolchain/bin