AGP: document boot options

Add documentation for AGP boot options.

Signed-off-by: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index fb80e9f..1156653 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -30,6 +30,7 @@
 parameter is applicable:
 
 	ACPI	ACPI support is enabled.
+	AGP	AGP (Accelerated Graphics Port) is enabled.
 	ALSA	ALSA sound support is enabled.
 	APIC	APIC support is enabled.
 	APM	Advanced Power Management support is enabled.
@@ -227,6 +228,12 @@
 			to assume that this machine's pmtimer latches its value
 			and always returns good values.
 
+	agp=		[AGP]
+			{ off | try_unsupported }
+			off: disable AGP support
+			try_unsupported: try to drive unsupported chipsets
+				(may crash computer or cause data corruption)
+
 	enable_timer_pin_1 [i386,x86-64]
 			Enable PIN 1 of APIC timer
 			Can be useful to work around chipset bugs