> Unfortunately after entering the command the system hangs. Prior hanging it
> quickly displays a message about the available memory than it switched the
> monitor to gray letters on a gray background :-)

 Which might still be OK, because the Amiga may have switched into a mode
your Monitor is not able to display.

 Please try out the -A (AGA) mode of loadbsd.

> PS. Booting from the swap partition is not possible, because the Amiga can't
> see it in the boot-menu from the startup-screen (Although its visible for
> rdbinfo and hdtoolbox)

 Just for the records: You did configure the partition as "bootable", did
you?

 Good luck.

Markus Illenseer