If you are specifically looking for 32-bit AROS cross compiler, here are instructions how to build it:

https://github.com/deadwood2/AROS/blob/alt-abiv0/INSTALL.md

I eventually partially solved my problem by a brute force method. I abandoned the idea of making a JH0 Amiga partition on the PC hard drive and instead I fitted an IDE68K into the A1000. This now works as DH0 for the A1000.

The XT-IDE card is now only handling a single PC partition for use by the Sidecar only. As before, this configuration works well as long as I use a very old version of Janus.library. Anything newer than 32.2, and the XTIDE boot menu fails to appear, even though the Sidecar is otherwise working well. If I examine the system's memory map using 'checkit', the XTIDE ROM appears in the expected place. I can even access the XTIDE using the configuration utility from a floppy drive. It just won't start up during boot.

Has anyone else tried using a later version of Janus.Library in a sidecar with XTIDE?

This is the last snapshot i got.

https://drive.google.com/file/d/1WhzK4iFhfXs_Dkyt_HxVrXRapCKFMnjC/view?usp=sharing

- Bluetooth sound is pain in the a**, either not working at all or laggy and choppy, even changing quality every 3 seconds (tested with 2 pairs of speakers and a (not cheap) headset)
- the memory overflow workaround (white dot) is really annoyng while working with/on mainly dark screens

Absolutely concur with these two, particularly the bluetooth sound as I often use AirPods in the evening. It's easy to tell when there's an issue, as I often get sound through only one bud, before experiencing lag/choppiness.

Ok, it’s been a while since I had time to really deep dive into my A600GS and there were some updates, so here are some things I’ve found and that I think need to be adressed. 

- CTRL-A-A quits out of Amibench instead of doing a reset after AmiBrowser has been used
- Bluetooth sound is pain in the a**, either not working at all or laggy and choppy, even changing quality every 3 seconds (tested with 2 pairs of speakers and a (not cheap) headset)
- the memory overflow workaround (white dot) is really annoyng while working with/on mainly dark screens
- while using a wb window and list the files as names you get artifacts of the outlined white font (see screenshot)



- the System Monitor is constantly triggering infos in the background, which causes slowdowns while file transfer, not very high but noticable, maybe change the update interval ?



- after using AmiBrowser for downloading, sometimes I get an error about not getting a response from server even if the internet connection is ok, causing Amibench to lock up and/or not showing mouse pointer any more
- will there be an update to Amiberry in the near future since at 5.8.10, we already get a performance boost for some problematic games like Jim Powers ? We already got 5.9.x out there and A600GS is still on 5.8.7