* System clock systems to be twice as fast as RTC
@ 2009-06-11 15:13 Subodh Nijsure
2009-06-11 16:07 ` Nate Case
2009-06-11 21:41 ` Grant Likely
0 siblings, 2 replies; 3+ messages in thread
From: Subodh Nijsure @ 2009-06-11 15:13 UTC (permalink / raw)
To: linuxppc-dev
I am running system with kernel 2.6.10 with following cpuinfo
sh-2.05b# cat /proc/cpuinfo
processor : 0
cpu : 440 in Virtex-5 FXT
clock : 200MHz
revision : 25.18 (pvr 7ff2 1912)
bogomips : 296.96
machine : Xilinx ML507 PPC440 evaluation board
plb bus clock : 100MHz
The system clock seems to be running twice as as fast as RTC,
sh-2.05b# date ; sleep 60 ; date
Fri Sep 11 01:37:11 UTC 1970
Fri Sep 11 01:37:41 UTC 1970
sh-2.05b# date ; sleep 60 ; date
Fri Sep 11 01:38:21 UTC 1970
Fri Sep 11 01:38:51 UTC 1970
sh-2.05b# date ; sleep 60 ; date
Fri Sep 11 01:38:59 UTC 1970
Fri Sep 11 01:39:29 UTC 1970
I have tried various values of CONFIG_HZ and that didn't help. Google
searches has shown up this issue on X86 system but not on PPC. Any hints as
to what I should be looking for? I have included relevant portion of config
file..
/Subodh
CONFIG_MMU=y
CONFIG_GENERIC_HARDIRQS=y
CONFIG_RWSEM_GENERIC_SPINLOCK=y
CONFIG_ASM_SEMAPHORES=y
CONFIG_HAVE_DEC_LOCK=y
CONFIG_PPC=y
CONFIG_PPC32=y
CONFIG_GENERIC_NVRAM=y
CONFIG_EXPERIMENTAL=y
CONFIG_CLEAN_COMPILE=y
CONFIG_BROKEN_ON_SMP=y
CONFIG_LOCK_KERNEL=y
CONFIG_LOCALVERSION=""
CONFIG_SWAP=y
CONFIG_SYSVIPC=y
CONFIG_SYSVIPC_SEMMNI=128
CONFIG_SYSVIPC_SEMMSL=250
CONFIG_POSIX_MQUEUE=y
CONFIG_SYSCTL=y
CONFIG_LOG_BUF_SHIFT=14
CONFIG_HOTPLUG=y
CONFIG_KOBJECT_UEVENT=y
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_KALLSYMS=y
CONFIG_FUTEX=y
CONFIG_EPOLL=y
CONFIG_SHMEM=y
CONFIG_CC_ALIGN_FUNCTIONS=0
CONFIG_CC_ALIGN_LABELS=0
CONFIG_CC_ALIGN_LOOPS=0
CONFIG_CC_ALIGN_JUMPS=0
CONFIG_LTT_MAX_HANDLES=128
CONFIG_LOCKLESS=y
CONFIG_BOOT_FLIGHT_BUFFERS=4
CONFIG_BOOT_FLIGHT_SIZE=524288
CONFIG_FLIGHT_PROC_BUFFERS=8
CONFIG_FLIGHT_PROC_SIZE=8192
CONFIG_NEWEV=y
CONFIG_CSTM=y
CONFIG_CREATE_DEV_CONSOLE=y
CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
CONFIG_MODULE_FORCE_UNLOAD=y
CONFIG_OBSOLETE_MODPARM=y
CONFIG_KMOD=y
CONFIG_44x=y
CONFIG_BOOKE=y
CONFIG_PTE_64BIT=y
CONFIG_PHYS_64BIT=y
CONFIG_MATH_EMULATION=y
CONFIG_4xx=y
CONFIG_XILINX_ML507=y
CONFIG_XILINX_OCP=y
CONFIG_XILINX_VIRTEX_5_FX=y
CONFIG_XILINX_VIRTEX=y
CONFIG_EMBEDDEDBOOT=y
CONFIG_PPC_GEN550=y
CONFIG_UART0_TTYS0=y
CONFIG_NOT_COHERENT_CACHE=y
CONFIG_PREEMPT_DESKTOP=y
CONFIG_PREEMPT=y
CONFIG_PREEMPT_BKL=y
CONFIG_HIGH_RES_TIMERS=y
CONFIG_BINFMT_ELF=y
CONFIG_CMDLINE_BOOL=y
CONFIG_CMDLINE="console=ttyS0,9600n8 initrd=0x1800000,32M rw root=/dev/ram
ip=$(ipaddr)::(gatewayip):$(subnetmask)::eth0:none eth=$(ethaddr)"
<snip>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: System clock systems to be twice as fast as RTC
2009-06-11 15:13 System clock systems to be twice as fast as RTC Subodh Nijsure
@ 2009-06-11 16:07 ` Nate Case
2009-06-11 21:41 ` Grant Likely
1 sibling, 0 replies; 3+ messages in thread
From: Nate Case @ 2009-06-11 16:07 UTC (permalink / raw)
To: Subodh Nijsure; +Cc: linuxppc-dev
On Thu, 2009-06-11 at 08:13 -0700, Subodh Nijsure wrote:
> The system clock seems to be running twice as as fast as RTC,
>
> sh-2.05b# date ; sleep 60 ; date
> Fri Sep 11 01:37:11 UTC 1970
> Fri Sep 11 01:37:41 UTC 1970
That's strange, but note that "date" reads the system clock and not the
RTC. Use "hwclock" for the RTC.
--
Nate Case <ncase@xes-inc.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: System clock systems to be twice as fast as RTC
2009-06-11 15:13 System clock systems to be twice as fast as RTC Subodh Nijsure
2009-06-11 16:07 ` Nate Case
@ 2009-06-11 21:41 ` Grant Likely
1 sibling, 0 replies; 3+ messages in thread
From: Grant Likely @ 2009-06-11 21:41 UTC (permalink / raw)
To: Subodh Nijsure; +Cc: linuxppc-dev
On Thu, Jun 11, 2009 at 9:13 AM, Subodh Nijsure<sunijsur@cisco.com> wrote:
>
>
> I am running system with kernel 2.6.10 with following cpuinfo
Wow, that's an old kernel version. 2.6.10 was released in 2004. Can
you move up to something more recent?
g.
> sh-2.05b# cat /proc/cpuinfo
> processor =A0 =A0 =A0 : 0
> cpu =A0 =A0 =A0 =A0 =A0 =A0 : 440 in Virtex-5 FXT
> clock =A0 =A0 =A0 =A0 =A0 : 200MHz
> revision =A0 =A0 =A0 =A0: 25.18 (pvr 7ff2 1912)
> bogomips =A0 =A0 =A0 =A0: 296.96
> machine =A0 =A0 =A0 =A0 : Xilinx ML507 PPC440 evaluation board
> plb bus clock =A0 : 100MHz
>
> The system clock seems to be running twice as as fast as RTC,
>
> sh-2.05b# date ; sleep 60 ; date
> Fri Sep 11 01:37:11 UTC 1970
> Fri Sep 11 01:37:41 UTC 1970
> sh-2.05b# date ; sleep 60 ; date
> Fri Sep 11 01:38:21 UTC 1970
> Fri Sep 11 01:38:51 UTC 1970
> sh-2.05b# date ; sleep 60 ; date
> Fri Sep 11 01:38:59 UTC 1970
> Fri Sep 11 01:39:29 UTC 1970
>
> I have tried various values of CONFIG_HZ and that didn't help. Google
> searches has shown up this issue on X86 system but not on PPC. Any hints =
as
> to what I should be looking for? I have included relevant portion of conf=
ig
> file..
>
>
> /Subodh
>
>
>
> CONFIG_MMU=3Dy
> CONFIG_GENERIC_HARDIRQS=3Dy
> CONFIG_RWSEM_GENERIC_SPINLOCK=3Dy
> CONFIG_ASM_SEMAPHORES=3Dy
> CONFIG_HAVE_DEC_LOCK=3Dy
> CONFIG_PPC=3Dy
> CONFIG_PPC32=3Dy
> CONFIG_GENERIC_NVRAM=3Dy
> CONFIG_EXPERIMENTAL=3Dy
> CONFIG_CLEAN_COMPILE=3Dy
> CONFIG_BROKEN_ON_SMP=3Dy
> CONFIG_LOCK_KERNEL=3Dy
> CONFIG_LOCALVERSION=3D""
> CONFIG_SWAP=3Dy
> CONFIG_SYSVIPC=3Dy
> CONFIG_SYSVIPC_SEMMNI=3D128
> CONFIG_SYSVIPC_SEMMSL=3D250
> CONFIG_POSIX_MQUEUE=3Dy
> CONFIG_SYSCTL=3Dy
> CONFIG_LOG_BUF_SHIFT=3D14
> CONFIG_HOTPLUG=3Dy
> CONFIG_KOBJECT_UEVENT=3Dy
> CONFIG_IKCONFIG=3Dy
> CONFIG_IKCONFIG_PROC=3Dy
> CONFIG_KALLSYMS=3Dy
> CONFIG_FUTEX=3Dy
> CONFIG_EPOLL=3Dy
> CONFIG_SHMEM=3Dy
> CONFIG_CC_ALIGN_FUNCTIONS=3D0
> CONFIG_CC_ALIGN_LABELS=3D0
> CONFIG_CC_ALIGN_LOOPS=3D0
> CONFIG_CC_ALIGN_JUMPS=3D0
> CONFIG_LTT_MAX_HANDLES=3D128
> CONFIG_LOCKLESS=3Dy
> CONFIG_BOOT_FLIGHT_BUFFERS=3D4
> CONFIG_BOOT_FLIGHT_SIZE=3D524288
> CONFIG_FLIGHT_PROC_BUFFERS=3D8
> CONFIG_FLIGHT_PROC_SIZE=3D8192
> CONFIG_NEWEV=3Dy
> CONFIG_CSTM=3Dy
> CONFIG_CREATE_DEV_CONSOLE=3Dy
> CONFIG_MODULES=3Dy
> CONFIG_MODULE_UNLOAD=3Dy
> CONFIG_MODULE_FORCE_UNLOAD=3Dy
> CONFIG_OBSOLETE_MODPARM=3Dy
> CONFIG_KMOD=3Dy
> CONFIG_44x=3Dy
> CONFIG_BOOKE=3Dy
> CONFIG_PTE_64BIT=3Dy
> CONFIG_PHYS_64BIT=3Dy
> CONFIG_MATH_EMULATION=3Dy
> CONFIG_4xx=3Dy
> CONFIG_XILINX_ML507=3Dy
> CONFIG_XILINX_OCP=3Dy
> CONFIG_XILINX_VIRTEX_5_FX=3Dy
> CONFIG_XILINX_VIRTEX=3Dy
> CONFIG_EMBEDDEDBOOT=3Dy
> CONFIG_PPC_GEN550=3Dy
> CONFIG_UART0_TTYS0=3Dy
> CONFIG_NOT_COHERENT_CACHE=3Dy
> CONFIG_PREEMPT_DESKTOP=3Dy
> CONFIG_PREEMPT=3Dy
> CONFIG_PREEMPT_BKL=3Dy
> CONFIG_HIGH_RES_TIMERS=3Dy
> CONFIG_BINFMT_ELF=3Dy
> CONFIG_CMDLINE_BOOL=3Dy
> CONFIG_CMDLINE=3D"console=3DttyS0,9600n8 initrd=3D0x1800000,32M rw root=
=3D/dev/ram
> ip=3D$(ipaddr)::(gatewayip):$(subnetmask)::eth0:none eth=3D$(ethaddr)"
> <snip>
>
>
>
>
>
>
>
>
>
>
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/linuxppc-dev
>
--=20
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2009-06-11 16:07 ` Nate Case
2009-06-11 21:41 ` Grant Likely
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