Merge branch '139-outdated-kernel-building-docs' into 'master'

Resolve "Outdated kernel building docs"

Closes #139

See merge request Librem5/developer.puri.sm!330

Development_Environment/Boards/HowTo/Rebuilding_the_Kernel.rst

@@ -26,9 +26,9 @@ Installing the Toolchain
 Install the necessary packages for your system. On Debian-based systems, you
 can do this with the ``apt`` tool::
 
-   sudo apt install crossbuild-essential-arm64 build-essential gcc-aarch64-linux-gnu bison
+   sudo apt install crossbuild-essential-arm64 build-essential gcc-aarch64-linux-gnu bison flex libssl-dev bc kmod
 
-On Fedora, use the ``dnf`` tool::
+On Fedora, use the ``dnf`` tool to install the extra packages. For example::
 
    sudo dnf install gcc-aarch64-linux-gnu binutils-aarch64-linux-gnu
 
@@ -39,8 +39,8 @@ Building the Kernel
 
 Clone the `linux-emcraft repository`_ and enter the working directory::
 
-   git clone https://source.puri.sm/Librem5/linux-emcraft.git
-   cd linux-emcraft
+   git clone -b imx8-5.2-devkit https://source.puri.sm/Librem5/linux-next.git linux-next-5.2
+   cd linux-next-5.2
 
 For simplicity, we create a directory to hold the modules that will be built::
 
@@ -51,12 +51,12 @@ Compile the kernel, optionally using ``ccache`` if installed::
    # With ccache:
    CROSS_COMPILE='ccache aarch64-linux-gnu-' \
    INSTALL_MOD_STRIP=1 INSTALL_MOD_PATH=_modules \
-   make ARCH=arm64 librem5-evk_defconfig all modules_install
+   make ARCH=arm64 librem5-devkit_defconfig all modules_install
 
    # Without ccache:
    CROSS_COMPILE=aarch64-linux-gnu- \
    INSTALL_MOD_STRIP=1 INSTALL_MOD_PATH=_modules \
-   make ARCH=arm64 librem5-evk_defconfig all modules_install
+   make ARCH=arm64 librem5-devkit_defconfig all modules_install
 
 You can also pass the ``-j`` command line option to ``make`` if you want to
 compile many files in parallel, specifying the number of parallel builds as an
@@ -75,7 +75,7 @@ From the workstation, copy the kernel and device tree binary to the board,
 replacing ``pureos`` with the IP address of the development board::
 
    scp arch/arm64/boot/Image root@pureos:/boot/boot2/
-   scp arch/arm64/boot/dts/freescale/librem5-evk.dtb  root@pureos:/boot/boot2/dtbs/
+   scp arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dtb  root@pureos:/boot/boot2/dtbs/
 
 Remove the ``source`` and ``build`` symlinks from the modules directory and
 copy the directory for the corresponding kernel version to the correct location