x86: add force_hpet boot option

add force_hpet boot option.

(this will be useful to make the forced-enable quirks depend on.)

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 2 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 189df0bcab99..c6859b94aaa7 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -431,8 +431,10 @@ and is between 256 and 4096 characters. It is defined in the file
                         over the 8254 in addition to over the IO-APIC. The
                         kernel tries to set a sensible default.
 
-        hpet=           [X86-32,HPET] option to disable HPET and use PIT.
-                        Format: disable
+        hpet=           [X86-32,HPET] option to control HPET usage
+                        Format: { enable (default) | disable | force }
+                        disable: disable HPET and use PIT instead
+                        force: allow force enabled of undocumented chips (ICH4, VIA)
 
         com20020=       [HW,NET] ARCnet - COM20020 chipset
                         Format: