Amiga OS4 on old (PPC) Macs

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Hi.

I reading something about it in anothe amiga forum and i cant believe the poor explanations or docs of this loader for macmini ppc, its true or hoax?

If its true, why make a loader only for a certain model of macmini ppc?

I own a macmini g4 1,42ghz 32mb radeon and this loader dont work here.

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Ok i trust you, but why this secretism?

1,5ghz 64mb radeon or the openfirmware are a minor update just for not run another OS, exist another version of this loader for different versions of openfirmware?

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Im trying on my macmini g4 (again)...

Booting with alt+left apple key+O+F
Then typing:
     setenv boota-device cd:
     boot cd:\\slb
Then some text and 6 options
 1 mm_full_silent
 2 mm_videodeb_nop96
 3 mm_videodeb_nop96_usb
 4 mm_full_video
 5 mm_full_silent_usb
 6 mm_full_silent_usb_debug

What option may use? Using option 1 i only have a black screen.

My mini g4 is openfirmware 4.8.9f1

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Still black screen with 5 and both mouse buttons pressed

This is a 1,42mhz one

edited: Using 4 option obtain an error screen with something like a debug error, anyway, its needed 512mb of ram? mine is 256mb