2.6.27.7 built for Geode: Clock drift

[Harald Dunkel]

Hi folks,

If I build a kernel for AMD Geode, then I see a clock drift of appr.
30 min. to 1 hour per day. If I build the same kernel for i486, then
the clock drift is gone. Running ntp makes no difference.

Hardware is a Linutop PC. /proc/cpuinfo says

processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 5
model           : 10
model name      : Geode(TM) Integrated Processor by AMD PCS
stepping        : 2
cpu MHz         : 0.000
cache size      : 128 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu de pse tsc msr cx8 sep pge cmov clflush mmx mmxext 3dnowext 3dnow
bogomips        : 429.05
clflush size    : 32
power management:

BTW, the CPU is running with 500 MHz (AFAIK). 0.000 MHz is surely not
correct. /proc/cpuinfo reports the same for both kernels.

Attached is the diff of the config files. Please mail if you are
interested in the complete config files, or if I can help to track
this down.


Regards

Harri
--- config-2.6.27.7-486	2008-12-02 03:36:11.000000000 +0100
+++ config-2.6.27.7-geode	2008-11-23 10:46:54.000000000 +0100
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
 # Linux kernel version: 2.6.27.7
-# Mon Dec  1 22:42:26 2008
+# Sun Nov 23 05:01:04 2008
 #
 # CONFIG_64BIT is not set
 CONFIG_X86_32=y
@@ -56,7 +56,7 @@
 CONFIG_EXPERIMENTAL=y
 CONFIG_BROKEN_ON_SMP=y
 CONFIG_INIT_ENV_ARG_LIMIT=32
-CONFIG_LOCALVERSION="-486"
+CONFIG_LOCALVERSION="-geode"
 # CONFIG_LOCALVERSION_AUTO is not set
 CONFIG_SWAP=y
 CONFIG_SYSVIPC=y
@@ -197,7 +197,7 @@
 # CONFIG_PARAVIRT_DEBUG is not set
 # CONFIG_MEMTEST is not set
 # CONFIG_M386 is not set
-CONFIG_M486=y
+# CONFIG_M486 is not set
 # CONFIG_M586 is not set
 # CONFIG_M586TSC is not set
 # CONFIG_M586MMX is not set
@@ -215,7 +215,7 @@
 # CONFIG_MWINCHIP2 is not set
 # CONFIG_MWINCHIP3D is not set
 # CONFIG_MGEODEGX1 is not set
-# CONFIG_MGEODE_LX is not set
+CONFIG_MGEODE_LX=y
 # CONFIG_MCYRIXIII is not set
 # CONFIG_MVIAC3_2 is not set
 # CONFIG_MVIAC7 is not set
@@ -227,15 +227,16 @@
 CONFIG_X86_CMPXCHG=y
 CONFIG_X86_L1_CACHE_SHIFT=7
 CONFIG_X86_XADD=y
-# CONFIG_X86_PPRO_FENCE is not set
-CONFIG_X86_F00F_BUG=y
 CONFIG_X86_WP_WORKS_OK=y
 CONFIG_X86_INVLPG=y
 CONFIG_X86_BSWAP=y
 CONFIG_X86_POPAD_OK=y
-CONFIG_X86_ALIGNMENT_16=y
 CONFIG_X86_INTEL_USERCOPY=y
+CONFIG_X86_USE_PPRO_CHECKSUM=y
+CONFIG_X86_USE_3DNOW=y
+CONFIG_X86_TSC=y
 CONFIG_X86_MINIMUM_CPU_FAMILY=4
+CONFIG_X86_DEBUGCTLMSR=y
 CONFIG_HPET_TIMER=y
 CONFIG_HPET_EMULATE_RTC=y
 CONFIG_DMI=y
@@ -423,6 +424,7 @@
 # CONFIG_MCA_PROC_FS is not set
 CONFIG_SCx200=m
 CONFIG_SCx200HR_TIMER=m
+CONFIG_GEODE_MFGPT_TIMER=y
 # CONFIG_OLPC is not set
 CONFIG_K8_NB=y
 # CONFIG_PCCARD is not set
@@ -1919,6 +1921,7 @@
 CONFIG_ADVANTECH_WDT=m
 CONFIG_ALIM1535_WDT=m
 CONFIG_ALIM7101_WDT=m
+CONFIG_GEODE_WDT=m
 CONFIG_SC520_WDT=m
 CONFIG_EUROTECH_WDT=m
 CONFIG_IB700_WDT=m