>Number:         2030
>Category:       port-sparc
>Synopsis:       cgthree video not enabled if not console
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    gnats-admin (GNATS administrator)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Feb  5 07:35:04 1996
>Last-Modified:
>Originator:     Juergen Hannken-Illjes
>Organization:
Juergen Hannken-Illjes - hannken@eis.cs.tu-bs.de - TU Braunschweig (W Germany)
>Release:        Sun Feb  4 14:41:25 1996<NetBSD-current source date>
>Environment:
	
System: NetBSD watcher 1.1A NetBSD 1.1A (CUSTOM) #0: Sun Feb 4 14:16:34 MET 1996 hannken@watcher:/usr/src/sys/arch/sparc/compile/CUSTOM sparc


>Description:
	
I'm running a dual headed Sun. bwtwo is the console. The second adapter is
a cgthree. The cgthree video doesn't get enabled.
At least the cgthree's btreg is followed by sixteen byte registers. The
control register's video-enable-bit must be set on the first open.
The same may hold for other frame buffers using btreg.
>How-To-Repeat:
	
>Fix:
	
--- sys/arch/sparc/dev/btreg.h.orig	Sat Oct 14 03:19:52 1995
+++ sys/arch/sparc/dev/btreg.h	Fri Feb  2 11:16:47 1996
@@ -78,3 +78,7 @@
 	u_int	bt_ctrl;		/* control register */
 	u_int	bt_omap;		/* overlay (cursor) map register */
+	u_char	fb_control;		/* fb control register */
+	u_char	fb_status;		/* fb status register */
 };
+
+#define FB_VIDEO_ENABLE	0x40
--- sys/arch/sparc/dev/cgthree.c.orig	Mon Dec 11 21:37:46 1995
+++ sys/arch/sparc/dev/cgthree.c	Fri Feb  2 11:28:11 1996
@@ -236,8 +236,15 @@
 	struct proc *p;
 {
+	register volatile struct bt_regs *bt;
 	int unit = minor(dev);
 
 	if (unit >= cgthreecd.cd_ndevs || cgthreecd.cd_devs[unit] == NULL)
 		return (ENXIO);
+
+	/* enable video if currently disabled */
+	bt = ((struct cgthree_softc *) cgthreecd.cd_devs[unit])->sc_bt;
+	if ((bt->fb_control & FB_VIDEO_ENABLE) == 0)
+		bt->fb_control |= FB_VIDEO_ENABLE;
+
 	return (0);
 }
>Audit-Trail:
>Unformatted: