DragonFly bugs List (threaded) for 2004-08
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Re: Problem with CUPS?
:Has anyone had any issues with their machines locking up soon after
:cups starts up? :-) Nothing shows up on the console (ie. no debugger),
:but my entire machine locks solid.
:
:Adam
Adam (and anyone with the freeze-on-serial-port or freeze-on-CUPS-start
problem), do me a favor and try some things:
(1) rename /dev/ttyd0, ttyd1, ttyd2, and ttyd3 to something else, e.g.
/dev/ttyd0.x, /dev/ttyd1.x, ... Then see if CUPS starts up.
(2) Restore the original namings and try to run a getty on ttyd0 by
editing /etc/ttys and HUPing init. See if that crashes the machine.
(3) If it does crash the machine, reboot (single user) and fix ttys back,
remove the last modification I had made to the serial port code
(see patch below), and try running a getty on ttyd0 again to see if
it still crashes.
Matthew Dillon
<dillon@xxxxxxxxxxxxx>
Index: sio.c
===================================================================
RCS file: /cvs/src/sys/dev/serial/sio/sio.c,v
retrieving revision 1.17
retrieving revision 1.16
diff -u -r1.17 -r1.16
--- sio.c 3 Jul 2004 21:23:37 -0000 1.17
+++ sio.c 19 May 2004 22:52:49 -0000 1.16
@@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* $FreeBSD: src/sys/isa/sio.c,v 1.291.2.35 2003/05/18 08:51:15 murray Exp $
- * $DragonFly: src/sys/dev/serial/sio/sio.c,v 1.17 2004/07/03 21:23:37 dillon Exp $
+ * $DragonFly: src/sys/dev/serial/sio/sio.c,v 1.16 2004/05/19 22:52:49 dillon Exp $
* from: @(#)com.c 7.5 (Berkeley) 5/16/91
* from: i386/isa sio.c,v 1.234
*/
@@ -733,21 +733,6 @@
}
/*
- * Make sure we can drain the receiver. If we can't, the serial
- * port may not exist.
- */
- for (fn = 0; fn < 256; ++fn) {
- if ((sio_getreg(com, com_lsr) & LSR_RXRDY) == 0)
- break;
- (void)sio_getreg(com, com_data);
- }
- if (fn == 256) {
- printf("sio%d: can't drain, serial port might "
- "not exist, disabling\n", device_get_unit(dev));
- return (ENXIO);
- }
-
- /*
* Enable the interrupt gate and disable device interupts. This
* should leave the device driving the interrupt line low and
* guarantee an edge trigger if an interrupt can be generated.
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