says:

 * I have also chosen a physical memory limit of 128 MB.  The 4c is
 * architecturally limited to 256 MB, but 128 MB is more than will
 * fit on present hardware.
[ ... ]
#define MAXMEM  (128 * 1024 * 1024)     /* no more than 128 MB phys mem */

this comment is rather dated, and only specific to some of the
sun4c's anyway.  shouldn't this MAXMEM be changed to something
else now?   or preferably removed all together...?

.mrg.