Make this driver work a whole lot better.

- Get the initial mode from the prom settings and don't clobber the mode
  on open.
- Copy output into an internal ring buffer instead of accessing the tty
  outq directly in the interrupt handler.  This fixes a problem where
  garbage would show up in the output stream.
- Reset the console port completely and reprogram all the parameters
  before enabling it.  This fixes seemingly random hangs on startup
  when using a fast interrupt handler.
- Add minimal locking in place of spls.
- Remove dead code and minor cleanups.

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/kern/subr_witness.c b/sys/kern/subr_witness.c
index b29265a..43198c0 100644
--- a/sys/kern/subr_witness.c
+++ b/sys/kern/subr_witness.c
@@ -211,6 +211,7 @@ static struct witness_order_list_entry order_lists[] = {
 #ifdef __i386__
 	{ "cy", &lock_class_mtx_spin },
 #endif
+	{ "sabtty", &lock_class_mtx_spin },
 	{ "ng_node", &lock_class_mtx_spin },
 	{ "ng_worklist", &lock_class_mtx_spin },
 	{ "ithread table lock", &lock_class_mtx_spin },