> FWIW /usr/include/mon/openprom.h in SunOS4 says:
> 
> #if     defined(sun4c) || defined(sun4m)
> #define MONSTART        (0xffd00000)
> #define MONEND          (0xfff00000)
> #endif

I noticed that in the NetBSD sources too.  bsd_openprom.h says:

#define OPENPROM_STARTVADDR     0xffd00000
#define OPENPROM_ENDVADDR       0xfff00000

I wrote a program to try and read those addresses in both /dev/mem
and /dev/kmem but the read just aborts with EFAULT.  Does anyone know
if that addresse range is mapped in the kernel virtual space?
				-mark