There are two ways to allow XFree86 to access linear memory:

    1. Disable the kernel security feature by initializing the
    ``securelevel'' variable to -1 in /sys/kern/kern_sysctl.c, line
    205 and building a new kernel. For more informations, see the
    comments in /usr/include/sys/systm.h.

there is also roland mcgrath's defeat-securelevel loadable
module that he posted here many many months ago.  check the
archives.  it used to work a long time ago, but it might
need porting now (i don't think so, but i haven't any idea
if it will or not).

.mrg.