hwclock --systohc locks machine up, RTC conflict problems

hwclock --systohc locks machine up, RTC conflict problems

[kinesis]

Issuing the command hwclock --systohc and sometimes at boot --hctosys causes
my machine to freeze.

The reason is there is a problem loading rtc-cmos. I will say that my
machine also runs Windows, and it detects the device fine as a Real Time
Clock/CMOS driver at io range 0070-0071. According to /proc/ioports rtc is
probed at 0070-0077.

During boot we get the following when attempting to modprobe rtc-cmos:


root@excalibur:/usr/src/linux-2.6# dmesg|grep rtc

drivers/rtc/hctosys.c: unable to open rtc device (rtc0)

rtc_cmos 00:09: i/o registers already in use

rtc_cmos: probe of 00:09 failed with error -16

root@excalibur:/usr/src/linux-2.6#



this has happened with the stock kernel that came with my distribution, as
well.

Apparently you can only use 0070-0071 for my rtc? how can I get the device
to work?

here is /proc/interrupts:

          CPU0       CPU1
  0:      23106   13272660   IO-APIC-edge      timer
  1:         49       5781   IO-APIC-edge      i8042
  8:          0          1   IO-APIC-edge      rtc
  9:        159       9301   IO-APIC-fasteoi   acpi
 12:       1818     190257   IO-APIC-edge      i8042
 14:          0         35   IO-APIC-edge      ide0
 17:       2174     312677   IO-APIC-fasteoi   nvidia
 18:        363      27432   IO-APIC-fasteoi   HDA Intel
 19:       1914     283347   IO-APIC-fasteoi   ndiswrapper
 20:       6434    1328206   IO-APIC-fasteoi   eth0
 21:          0          0   IO-APIC-fasteoi   ohci_hcd:usb2
 22:          0          0   IO-APIC-fasteoi   ehci_hcd:usb1
 23:        209      19944   IO-APIC-fasteoi   sata_nv
NMI:          0          0   Non-maskable interrupts
LOC:   13272488      22989   Local timer interrupts
RES:     105913      91197   Rescheduling interrupts
CAL:        151        134   function call interrupts
TLB:      18445      19521   TLB shootdowns
TRM:          0          0   Thermal event interrupts
THR:          0          0   Threshold APIC interrupts
SPU:          0          0   Spurious interrupts
ERR:          0


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Re: hwclock --systohc locks machine up, RTC conflict problems

[Ingo Molnar]

* kinesis <jriley1337@yahoo.com> wrote:

> my machine is 64bit running SLAMD64 v12 (slackware) Linux excalibur 
> 2.6.24-rc4-kinesis-g94545bad #8 SMP Sun Dec 9 10:47:29 PST 2007 x86_64 
> x86_64 x86_64 GNU/Linux
> 
> Issuing the command hwclock --systohc and sometimes at boot --hctosys 
> causes my machine to freeze.

could you try the "x86: IO delay quirk" patch attached to this bugzilla:

  http://bugzilla.kernel.org/show_bug.cgi?id=6307

please boot with io_delay=0xed [or io_delay=udelay or io_delay=none].

does that fix the lockups?

	Ingo