[U-Boot] Some issues with the python tests

[Stefan Bruens]

Hi,

I have started diving into the u-boot python tests. Now I have come accross 
two problems:

1. I would like to access the config, specifically the paths to e.g. 
build_dir, result_dir, ...
2. I would like to run and log system commands

Now while I can do this via the u_boot_console fixture, I would like to issue 
some of my fixture setup on the session/module level. Unfortunately, the 
u_boot_console fixture has "function" scope, and thus my fixtures are limited 
to function scope as well.

Although for the u_boot_console (i.e. the sandbox instance or the SoC 
terminal) function scope is likely correct, the runner/logger and the config 
should be accessible independent of u_boot_console.

Any ideas how to solve this issue?

Kind regards,

Stefan

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