Added more comments to the sum-example

Fix for bilby verification (partly reverting 4c2d7f0)

This possibly breaks stuff: this change certainly had
a purpose?

ITP 2021 artefact

[impl]serial: Fix UART initialisation.

Deleted some initialisation code during cleanup, rewrite that.

bilby fixes for kernel version 4.3.1

bump version to 2.0.5

* update maintainer and email
* update project homepage

readme: fix a broken link

more decription of the homepage