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03-linux-kernel.zybo.md

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

Adrian Remonda 2016

Prerequisites

  • Linaro toolchain installed
  • Zybo with Linux running
  • If using Debian setup the tool chain as next [ Setup Toolchain in debian] (02-toolchain.md)
  • If using Ubuntu install the next packages:
~$ sudo apt-get install -y device-tree-compiler lzma lzop u-boot-tools 
~$ sudo apt-get install -y gcc-arm-linux-gnueabihf

Download kernel sources

~$ LINUX_TAG=xilinx-v2016.4
~$ 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_xilinx_kernel.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_zynq_defconfig

Configure the kernel (works with the default configuration)

~$ make menuconfig

Device tree

Copy the device tree from /zybo/zynq-zybo.dts to /arch/arm/boot/dts/zynq-zed.dts

~$ gedit arch/arm/boot/dts/zynq-zybo.dts

Change the line "chosen" parameters as next:

chosen {
	bootargs = "console=ttyPS0,115200 root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait earlyprintk";
	linux,stdout-path = "/amba/serial@e0001000";
};

To add new perhiperals edit the next file:

arch/arm/boot/dts/zynq-7000.dtsi

Compile kernel modules and device tree

~$ make zynq-zybo.dtb
~$ make uImage -j4
~$ make modules -j4
~$ make modules_install INSTALL_MOD_PATH=./modules

Deploy in the board

Install remotely over SSH

~$ scp arch/arm/boot/dts/zynq-zybo.dtb root@${ip}:${boot}/devicetree.dtb
~$ scp arch/arm/boot/uImage 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 arch/arm/boot/dts/zynb-zybo.dtb /media/$USER/BOOT/devicetree.dtb
~$ cp -v arch/arm/boot/uImage /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

TODO

  • Increase ram to 1G (0x40000000) arch/arm/boot/dts/zynq-zed.dts