Invalid memory access at

[Peter Grehan]

> Hello people, I'm trying to boot freeBSD in a PowerMac G4, but after I
> holding "c", I got the OpenFirmware screen saying that occurred a
> invalid memory acces at "R$0..something...."... 

  Try breaking to the OpenFirmware prompt by holding down cmd-option-o-f 
at boot-time and then issuing:

   0 > boot cd:,\boot\loader cd:0

later,

Peter.