[PATCH] VT binding: Update documentation
Update Documentation/fb/fbcon.txt and Documentatin/console/console.txt to
reflect the following changes:
1. sysfs attributes are relocated to /sys/class/vtconsole
2. feature is selectable in Kconfig
3. add sample scripts to fbcon.txt
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/Documentation/fb/fbcon.txt b/Documentation/fb/fbcon.txt
index b91aea5..f373df1 100644
--- a/Documentation/fb/fbcon.txt
+++ b/Documentation/fb/fbcon.txt
@@ -180,10 +180,13 @@
So, how do we unbind fbcon from the console? Part of the answer is in
Documentation/console/console.txt. To summarize:
-Echo the ID number of the 'frame buffer driver' to:
+Echo a value to the bind file that represents the framebuffer console
+driver. So assuming vtcon1 represents fbcon, then:
-sys/class/tty/console/bind - attach framebuffer console to console layer
-sys/class/tty/console/unbind - detach framebuffer console from console layer
+echo 1 > sys/class/vtconsole/vtcon1/bind - attach framebuffer console to
+ console layer
+echo 0 > sys/class/vtconsole/vtcon1/bind - detach framebuffer console from
+ console layer
If fbcon is detached from the console layer, your boot console driver (which is
usually VGA text mode) will take over. A few drivers (rivafb and i810fb) will
@@ -211,19 +214,15 @@
5. Now to detach fbcon:
- 'cat /sys/class/tty/console/backend' and take note of the ID
-
-The above is probably needed only once. Then:
-
vbetool vbestate restore < <vga state file> && \
- echo <ID> > /sys/class/tty/console/unbind
+ echo 0 > /sys/class/vtconsole/vtcon1/bind
6. That's it, you're back to VGA mode. And if you compiled fbcon as a module,
you can unload it by 'rmmod fbcon'
7. To reattach fbcon:
- echo <ID> > /sys/class/tty/console/bind
+ echo 1 > /sys/class/vtconsole/vtcon1/bind
8. Once fbcon is unbound, all drivers registered to the system will also
become unbound. This means that fbcon and individual framebuffer drivers
@@ -254,6 +253,8 @@
c. Attach fbcon
vbetool vbestate restore < <vesa state file> && \
+ echo 1 > /sys/class/vtconsole/vtcon1/bind
+
Variation 2:
a. Before detaching fbcon, do:
@@ -269,7 +270,55 @@
c. Attach fbcon:
vbetool vbemode set <mode number> && \
- echo <ID> > /sys/class/tty/console/bind
+ echo 1 > /sys/class/vtconsole/vtcon1/bind
+
+Samples:
+========
+
+Here are 2 sample bash scripts that you can use to bind or unbind the
+framebuffer console driver if you are in an X86 box:
+
+---------------------------------------------------------------------------
+#!/bin/bash
+# Unbind fbcon
+
+# Change this to where your actual vgastate file is located
+# Or Use VGASTATE=$1 to indicate the state file at runtime
+VGASTATE=/tmp/vgastate
+
+# path to vbetool
+VBETOOL=/usr/local/bin
+
+
+for (( i = 0; i < 16; i++))
+do
+ if test -x /sys/class/vtconsole/vtcon$i; then
+ if [ `cat /sys/class/vtconsole/vtcon$i/name | grep -c "frame buffer"` \
+ = 1 ]; then
+ if test -x $VBETOOL/vbetool; then
+ echo Unbinding vtcon$i
+ $VBETOOL/vbetool vbestate restore < $VGASTATE
+ echo 0 > /sys/class/vtconsole/vtcon$i/bind
+ fi
+ fi
+ fi
+done
+
+---------------------------------------------------------------------------
+#!/bin/bash
+# Bind fbcon
+
+for (( i = 0; i < 16; i++))
+do
+ if test -x /sys/class/vtconsole/vtcon$i; then
+ if [ `cat /sys/class/vtconsole/vtcon$i/name | grep -c "frame buffer"` \
+ = 1 ]; then
+ echo Unbinding vtcon$i
+ echo 1 > /sys/class/vtconsole/vtcon$i/bind
+ fi
+ fi
+done
+---------------------------------------------------------------------------
--
Antonino Daplas <adaplas@pol.net>