About the .atari800.cfg File

[CommodoreOS]

I am running Retroarch on a Arm System that has a roofs thats read only(Rockchip SoC) and Retroarch keeps looking for it on its rootfs root or in /etc folder and even tries to make it but on the rootfs root, need a way of editing its location so it can be read on a different partition, you should be able to edit it in the retroarch.cfg file and change it but you can't.
It can not find it bios rom files without the .atari800.cfg, and I have pointed Retroarch to system folder and it still does not find them.
You could make it look on /mnt as well as the other locations, if you do not want to add to Retroarch.cfg, that would be better.

[jfroco]

In the current version, you do not need to have the .atari800.cfg configuration file. However, if it is present, it will be loaded, which may conflict with the pure RetroArch configuration. So, you may want to delete it.

If you run the core without the .atari800.cfg configuration file, the core will try to load the ROM files from the system directory.

You should this log:

User config file '.atari800.cfg' not found.
Trying system wide config file: /etc/atari800.cfg
No configuration file found, will create fresh one from scratch:
Cannot write to config file: .atari800.cfg

Hope this helps.