I've got a watch looking at /dev/mem
2011-11-30T14:02:42.624523-08:00 node/x.x.x.x audispd: node=node type=PATH msg=audit(1322690562.613:38): item=0 name="/dev/mem" inode=1358 dev=00:05 mode=020640 ouid=0 ogid=15 rdev=01:01
2011-11-30T14:02:42.624494-08:00 node/x.x.x.x audispd: node=node type=CWD msg=audit(1322690562.613:38): cwd="/"
2011-11-30T14:02:42.624480-08:00 node/x.x.x.x audispd: node=node type=SYSCALL msg=audit(1322690562.613:38): arch=40000003 syscall=5 per=400000 success=yes exit=3 a0=8048f6c a1=2 a2=180 a3=0 items=1 ppid=4132 pid=4199 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="IrqRouteTbl" exe="/opt/hp/hp-health/bin/IrqRouteTbl" key="kernel"