Indigo 2 - "NESTED EXCEPTION" at boot.

The following error is sent via serial port #1 during Indigo 2 boot, just after boot tune: Exception: <vector=Normal> Status register: 0x30044803<CU1,CU0,CH,IM7,IM4,IPL=???,MODE=KERNEL,EXL,IE> Cause register: 0x8000c000<BD,CE=0,IP8,IP7,EXC=INT> Exception PC: 0x9fc368f8, Exception RA: 0x9fc368d8 Interrupt exception Bus Error ? Local I/O interrupt register 0: 0x4 <SCSI1> Local I/O interrupt register 2: 0xc8 <EISA,SLOT0,SLOT1> Saved user regs in hex (&gpda 0xa8740e48, &_regs 0xa8741048): arg: a8740000 20 20 12 tmp: a8740000 1f a8000000 8000000 a8746f78 0 ffffffff 4 sve: a8740000 c12dc13a 0 c0f9138a 0 c0edd9c9 0 bf077b8a t8 a8740000 t9 c0dcea58 at 0 NESTED EXCEPTION #1 at EPC: 9fc24020; first exception at PC: 9fc368f8 Any idea what to do about this? What can be the reason, bad memory, bad planar or CPU? -- If you cut off my head, what would I say? Me and my head, or me and my body?