Hello!
"make menuconfig" for x86_64 looks somewhat funky:
[ ] Provide RTC interrupt (NEW)
Code maturity level options --->
General setup --->
...I believe all x86_64 specific options for HPET timer should be moved to the "Processor type and features" menu. That's where they are located for i386. There are two such options - HPET_TIMER and HPET_EMULATE_RTC.
Also, there is no prompt for HPET_TIMER, so it's always set. However, the help text ends with "If unsure, say Y". Kind of pointless, isn't it? I enabled the prompt and deselected HPET_TIMER. The kernel compiled and booted just fine. Kernel messages don't indicate that HPET is used, but they said so when HPET_TIMER was enabled.
The patch does two things:
- HPET_TIMER and HPET_EMULATE_RTC are moved from the top-level to "Processor type and features" - HPET_TIMER can be deselected (just like on i386)
The patch is against current Linux snapshot (svn revision 26268).
-- Regards, Pavel Roskin
Index: arch/x86_64/Kconfig
===================================================================
--- arch/x86_64/Kconfig (revision 26268)
+++ arch/x86_64/Kconfig (working copy)
@@ -62,23 +62,6 @@
with klogd/syslogd or the X server. You should normally N here,
unless you want to debug such a crash.
-config HPET_TIMER
- bool
- default y
- help
- Use the IA-PC HPET (High Precision Event Timer) to manage
- time in preference to the PIT and RTC, if a HPET is
- present. The HPET provides a stable time base on SMP
- systems, unlike the RTC, but it is more expensive to access,
- as it is off-chip. You can find the HPET spec at
- <http://www.intel.com/labs/platcomp/hpet/hpetspec.htm>.
-
- If unsure, say Y.
-
-config HPET_EMULATE_RTC
- bool "Provide RTC interrupt"
- depends on HPET_TIMER && RTC=y
-
config GENERIC_ISA_DMA
bool
default y
@@ -193,6 +176,23 @@
bool
default y
+config HPET_TIMER
+ bool "HPET Timer Support"
+ default y
+ help
+ Use the IA-PC HPET (High Precision Event Timer) to manage
+ time in preference to the PIT and RTC, if a HPET is
+ present. The HPET provides a stable time base on SMP
+ systems, unlike the RTC, but it is more expensive to access,
+ as it is off-chip. You can find the HPET spec at
+ <http://www.intel.com/labs/platcomp/hpet/hpetspec.htm>.
+
+ If unsure, say Y.
+
+config HPET_EMULATE_RTC
+ bool "Provide RTC interrupt"
+ depends on HPET_TIMER && RTC=y
+
config MTRR
bool "MTRR (Memory Type Range Register) support"
---help---
