Pull up following revision(s) (requested by martin in ticket #338):
sys/arch/sparc64/dev/sab.c: revision 1.55
sys/dev/ic/com.c: revision 1.345
sys/dev/ic/z8530tty.c: revision 1.132
sys/dev/sun/sunkbd.c: revision 1.30
sys/dev/sun/sunms.c: revision 1.33
sys/sys/tty.h: revision 1.94
As discussed on tech-kern: define a new tty internal state flag: TS_KERN_ONLY
Implement it in a few tty drivers. If this flag is set, the underlying
hardware is used by another driver and userland has no right to open
it. A few uses will appear soon in sys/dev/sun/sun{kbd,ms}.c.
--
PR port-sparc64/52622: mark the parent device as TS_KERN_ONLY,
so userland will not touch it (and change serial params w/o our
control).

(snj)