Modify, rebuild and reload the Linux® kernel

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1. Overview

This stage will explain you how modify, rebuild and reload the Linux® kernel.
You will first be guide to install the Linux® kernel source code in the Developer Package directory. Then step by step you will execute procedures to modify, rebuild and reload the Linux® kernel.

2. Download the the Linux® kernel source

Download the STM32MP15-Ecosystem-v1.0.0 Developer Package Sources in your $HOME/STM32MPU_workspace/STM32MP15-Ecosystem-v1.0.0/Developer-Package directory
Uncompress the tarball file to get the Linux® kernel tarball, the ST patches and the ST configuration fragments

 cd $HOME/STM32MPU_workspace/STM32MP15-Ecosystem-v1.0.0/Developer-Package
 tar xvf SOURCES-stm32mp1-openstlinux-4.19-thud-mp1-19-02-20.tar.xz

3. Prepare the Linux® kernel source

Extract the Linux® kernel source

 cd stm32mp1-openstlinux-4.19-thud-mp1-19-02-20/sources/arm-openstlinux_weston-linux-gnueabi/linux-stm32mp-4.19-r0
 tar xvf linux-4.19.9.tar.xz

Apply the ST patches

 cd linux-4.19.9/
 for p in `ls -1 ../*.patch`; do patch -p1 < $p; done

Apply fragments

 make multi_v7_defconfig fragment*.config
 for f in `ls -1 ../fragment*.config`; do scripts/kconfig/merge_config.sh -m -r .config $f; done
 yes '' | make oldconfig