G4 (7447A) CPU and dynamic frequency scaling

["Joel Carnat" <joel%carnat.net@localhost>]

Hello,

I read here
(http://en.wikipedia.org/wiki/PowerPC_G4#PowerPC_7447.2F7457_.22Apollo_7.22)
that my MacMini G4 should support "dynamic frequency scaling". From what I
understood this should enable to CPU frequency to be modified by software
(like Intel Speedstep does).

NetBSD 4.99.72/macppc says:
cpu0 at mainbus0: 7447A (Revision 1.5), ID 0 (primary)
cpu0: HID0 8450c0bc<EMCP,EICE,NAP,DPM,ICE,DCE,SGE,BTIC,FBIOB,ABE,BHT>,
powersave: 1
cpu0: 1500.00 MHz, 512KB L2 cache no parity parity enabled

On /i386 and /amd64, I use "sysctl machdep" to check/set to speed settings
but there's nothing on my Mini/macppc.

My questions are :
- do the 7447A really support CPU frequency scaling (at software level) ?
- do NetBSD support this ?
- what does "powersave: 1" mean ?

TIA,
     Jo