I propose this patch, which solves my issue. Comments?
$ cvs diff -U3 sio.c
Index: sio.c
===================================================================
RCS file: /usr/cvs/src/sys/isa/Attic/sio.c,v
retrieving revision 1.291.2.33.1000.4
diff -U3 -r1.291.2.33.1000.4 sio.c
--- sio.c 13 May 2003 23:51:23 -0000 1.291.2.33.1000.4
+++ sio.c 10 Aug 2003 18:11:37 -0000
@@ -274,6 +274,7 @@
struct termios lt_in; /* should be in struct tty */
struct termios lt_out;
+ bool_t in_polled_mode;
bool_t do_timestamp;
bool_t do_dcd_timestamp;
struct timeval timestamp;
@@ -1985,6 +1986,10 @@
struct timecounter *tc;
u_int count;
+ if (com->in_polled_mode) {
+ return;
+ }
+
int_ctl = inb(com->intr_ctl_port);
int_ctl_new = int_ctl;
@@ -3085,6 +3090,9 @@
sp->ier = inb(iobase + com_ier);
outb(iobase + com_ier, 0); /* spltty() doesn't stop siointr()
*/
siocntxwait(iobase);
+ if (com_addr(comconsole)) {
+ (com_addr(comconsole))->in_polled_mode = TRUE;
+ }
sp->cfcr = inb(iobase + com_cfcr);
outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS);
sp->dlbl = inb(iobase + com_dlbl);
@@ -3132,6 +3140,9 @@
*/
outb(iobase + com_mcr, sp->mcr | MCR_DTR | MCR_RTS);
outb(iobase + com_ier, sp->ier);
+ if (com_addr(comconsole)) {
+ (com_addr(comconsole))->in_polled_mode = FALSE;
+ }
}
static void
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