I recognized the failure on boot for the rage128 ...firmware not loaded or something... I could not take a picture of that message. But that indicates me that getting 3D hw-acc will possible be problematic on Debian10 PPC too.
Now I see the partition map. What do you think about this?
Is N12 (1MB) the yaboot partion that would be bootet at start and let me choose between "linux, OS9, OSX" ?
How am I supposed to do this on Debian10 which should have no "yaboot" but "grub" instead.
On PC I always use xfdisk partitioner and bootmanager. On PC I always place grub at the start on the first linux partition so that the bootloader (xfdik) starts grub and grub boots linux. How could this be done on Debian 10PPC with grub?
This is very high risk...perhaps I should make a copy of the software already installed on the machine if something goes wrong and debian kills my actual setup.