Re: RTC bug?

[William C. <wc...@nc...>]

No, commenting out the modprobe will not fix the problem. The problem is 
the OProfile driver is not being started. The "nortc" option needs to be 
passed to the kernel when the kernel starts up for the OProfile driver 
to work; this is a change in the /boot/grub/grub.conf file. The OProfile 
driver is not a module, commenting out the module loading section does 
not solve the basic problem with the RTC driver/OProfile driver 
conflict. Commenting the modprobe out will just move the problem a 
little later in the process.

When I get in to the office Tuesday morning I will generate the patch to 
fix the problem. I don't have Red Hat 8.0 running on a P4 system at home.

-Will



Ian Ollmann wrote:
> On Mon, 21 Oct 2002, William Cohen wrote:
> 
> 
>>I see that you have filed a bugzilla report on oprofile, 76455. The
>>problem is the default RH Linux 8.0 kernel has the RTC support compiled
>>into the kernel and this RTC support conflicts with the OProfile RTC
>>support (P4 only supported via RTC mode).  You can pass a kernel option
>>"nortc" in the grub.conf file to allow OProfile in RTC mode to be used
>>on Pentium 4 (and other processors with unsupported performance
>>monitoring hardware).
>>
>>In the RH Linux kernel 8.0, OProfile is not a module. The OProfile
>>support is compiled into the kernel. It shouldn't attempt to load a
>>module. The error message you are seeing is a side effect of
>>/proc/devices/oprofile not being there because the RTC conflict.
> 
> 
> Is it sufficient for me to just comment out the module loading segments of
> op_start?
> 
> Ian
> 
> 
> ---------------------------------------------------
>    Ian Ollmann, Ph.D.       ia...@cc...
> ---------------------------------------------------
> 
>