enhanced real time clock support; how to say 'y'

enhanced real time clock support; how to say 'y'

Post by John Hunte » Sat, 24 Mar 2001 23:45:52



In the kernel config for 2.4.2 I have said 'y' to symmetric
multiprocessor support since I have two processors.  The 'Help' button
says to also say yes to enhanced real time clock support.  How do I
find/do this with 'make xconfig'.  I can't find the setting.

When I try to boot the kernel built as it is (ie no enhanced clock
support), the boot freezes very early on (just after the CPU
detection) on the line 'activating NMI watchdog' and never recovers.
I don't know if this is related to the clock feature or is another
problem.

Thanks,
John Hunter

 
 
 

enhanced real time clock support; how to say 'y'

Post by Tony Curti » Sat, 24 Mar 2001 23:52:58


>> On 23 Mar 2001 08:45:52 -0600,

> In the kernel config for 2.4.2 I have said 'y' to
> symmetric multiprocessor support since I have two
> processors.  The 'Help' button says to also say yes to
> enhanced real time clock support.  How do I find/do this
> with 'make xconfig'.  I can't find the setting.

"Character Devices", about 3/4 of the way down.

hth
t
--
Just reach into these holes.  I use a carrot.

 
 
 

enhanced real time clock support; how to say 'y'

Post by John Hunte » Sun, 25 Mar 2001 00:10:56


    Tony> "Character Devices", about 3/4 of the way down.

Thanks, I plowed ahead and did it manually in .config but I'll
remember this one for next time.

Incidentally, my system did not freeze on the NMI Watchdog after this
change.

JDH

 
 
 

enhanced real time clock support; how to say 'y'

Post by bill davids » Thu, 29 Mar 2001 03:49:31





|
|     Tony> "Character Devices", about 3/4 of the way down.
|
|
| Thanks, I plowed ahead and did it manually in .config but I'll
| remember this one for next time.
|
| Incidentally, my system did not freeze on the NMI Watchdog after this
| change.

  Gklad you got it going. I generally use menuconfig for kernels.

  Question for guru attention: why is this an option? Is there any time
when you don't want enhanced real time clock? I've been saying yes for
ages out of habit (I have many SMP systems), but even on decades-old
386SX16 systems it works fine. I assume there's a reason to "not want"
the feature.

--

At LinuxExpo Sun was showing Linux applications running on Solaris.
They don't get it, the arrow points the other way. There's a reason why
there's no SolarisExpo, Solaris is a tool; Linux is a philosophy, a
religion, a way of life, and only incidentally an operating system.

 
 
 

1. [RESEND] Don't ask about "Enhanced Real Time Clock Support" on some archs

The following patch adds an explicit no list of arches who do not want
to have the "Enhanced Real Time Clock Support" RTC driver asked.  This
adds PPC32 (who for a long time had their own 'generic' RTC driver, and
then have adopted the genrtc driver) and PARISC (who have always used
the genrtc driver).

The problem is that on some archs there is no hope of this driver
working, and having it compiled into the kernel can cause many different
problems.  On the other hand, there are some arches for whom that driver
does work, on some platforms.  So having an explicit yes list would
result in some rather ugly statements.

--
Tom Rini (TR1265)
http://gate.crashing.org/~trini/

===== drivers/char/Kconfig 1.1 vs edited =====
--- 1.1/drivers/char/Kconfig    Tue Oct 29 18:16:55 2002

 config RTC
        tristate "Enhanced Real Time Clock Support"
+       depends on PPC32 != y && PARISC != y
        ---help---
          If you say Y here and create a character special file /dev/rtc with
          major number 10 and minor number 135 using mknod ("man mknod"), you
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