Install PetaLinux 2020.2

Install required packages:

diffstat chrpath socat libtool libtool-bin libncurses5-dev libssl-dev zlib1g-dev

gcc net-tools make autoconf git

And ncurses:

libncurses5 libncursesw5

Set bash as default shell:
```
dpkg-reconfigure dash 
```
Download PetaLinux from Xilinx - PetaLinux version have to match the installed Vivado version:
https://www.xilinx.com/support/download/index.html/content/xilinx/en/downloadNav/embedded-design-tools.html
Run downloaded PetaLinux installer:
```
./petalinux-v2020.2-final-installer.run -d <path_to_PetaLinux_target_directory>
```
It seems to be better to install the PetaLinux as user in user-accessible directory, not as root in /opt/.
Create source script which will later set the PetaLinux environment. Assume example name settings_petalinux_2020.2.sh:
```
source <path_to_PetaLinux_target_directory>/settings.sh
```
In order to use the PetaLinux, source the settings_petalinux_2020.2.sh script.

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