Quoting another A.org member who owns a Kylwalda:
"From the motherboard a floppy a cable goes to Kylwalda boot adapter, then this adapter chains to Catweasel. Without Kylwalda I would not have a bootable DF0:, as you cannot boot directly from a Catweasel connected floppy, at cold boot (that's why Individual Computers released this boot adapter)."
It is my understanding that this arrangement will work with the Catweasle installed in an Amiga, or in a PC where the Catweasle is used under emulation. Amiga Hardware Database site states:
"Can also integrate an ISA Catweasel with a PC floppy controller."
I also had seen a similar statement on Jens site, but can't find it now.
Since the Mk4 and the Mk3/Flipper versions of the Catweasle both have PCI connectors, I would think that the same holds true for them in a PC.
The addition of the Kylwalda to a Catweasle is the only way to boot from a Catweasle controlled floppy drive.
As I do not own a Kylwalda, I can't test this assumption through WinUAE/Amiga Forever/AmiKit/etc.
If anyone else has both the Kylwalda and Catweasle Mk3, or Mk4 combination, can you please try to boot from it using WinUAE, or Amiga Forever, or AmiKit? That way I will know if I should pursue finding a Kylwalda used somewhere, or begging Jens to make one last production run of them for those of us that want one.
Edit: If anyone that owns a Kylwalda will be attending either the CommVEx4 event, or AmiWest this year, please bring it with you and I will bring a PC with one of my Catweasle cards installed in it to test out this functionality. I am trying to make arrangements to attend both of those events.