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05-linux-kernel.ultraZed.md

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Guide How to compile and install the Xilinx Linux Kernel in the ultraZed board

Hochmüller Stephan 2017

Prerequisites

  • Linaro toolchain 64bit installed
  • ultraZed with Linux running
  • arm 64bit compiler:
    • If using Debian or Ubuntu setup the tool chain as next [ Setup Toolchain in debian] (02-toolchain.md) or
    • Directly Linaro toolchain 64bit

Note: with Debian Jessie the Kernel doesn't compile, test with Debian Stretch

Download kernel sources

~$ LINUX_TAG=xilinx-v2017.1
~$ wget https://github.com/Xilinx/linux-xlnx/archive/${LINUX_TAG}.zip && unzip ${LINUX_TAG}.zip && cd linux-xlnx-${LINUX_TAG}
~$ git init
~$ git add .
~$ git commit -m "Linux vanilla"

Set the compiler and add variables

~$ . ./export_me_ultraZed.sh

To check the that the compiler was setup correctly:

~$ ${CC}gcc --version

Get the config file

This file contains the linux configuration. Get the default

~$ make xilinx_zynqmp_defconfig

Configure the kernel

~$ make menuconfig
to configure OpenAMP ensure that the following module is enabled:
	Device Driver
	|
	---> Remoteproc drivers
		|
		--->ZynqMP_r5 remoteproc support

Note: The Rpmsg driver is also needed. If the drivers are enabled in kernel configuration an error gets obtained at branch 2017.1. To still get the module compiled the rpmsg_user_dev_driver from https://github.com/Xilinx/meta-openamp/blob/rel-v2017.1/recipes-kernel/rpmsg-user-module/files/rpmsg_user_dev_driver.c can be used. The module and a makefile is given in /ultrazed/rpmsg_user_dev_driver.

Device tree

use the device tree source file provided in /ultrZed/device_tree and build it with the build_dts.sh script

Compile kernel modules and device tree

~$ make Image -j4
~$ make modules -j4
~$ make modules_install INSTALL_MOD_PATH=./modules

Deploy in the board

Install remotely over SSH

~$ scp <repo path>/ultrazed/system.dtb root@${ip}:${boot}/devicetree.dtb
~$ scp arch/arm64/boot/Image root@$ip:${boot}
~$ ssh root@$ip 'unlock'
~$ rsync -avc modules/lib/. root@$ip:/lib/. && ssh root@$ip 'sync'

Local with an SD card reader

~$ cp -v scp <repo path>/ultrazed/system.dtb /media/$USER/BOOT/devicetree.dtb
~$ cp -v arch/arm64/boot/Image /media/$USER/BOOT
~$ sudo rsync -avc modules/lib/. /media/$USER/rootfs/lib/.
~$ sync

After the first boot

At the first access to the board command line update the module dependencies by typing this command:

~# depmod -a

Misc

How to Create parches

~$ git commit

~$ git format-patch -1 -o ../patches/

Apply patches

~$ patch -p1 < ../patches/ check patches