[gentoo-user] RTC, is it needed?

[gentoo-user] RTC, is it needed?

[Mick]

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Hi All,

Not sure if I need RTC built in my kernel.  This is the error I get when I 
boot up:
=======================================================
# dmesg | grep -i RTC
Using IPI Shortcut mode
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
=======================================================

This is what I have in the kernel:
=======================================================
# cat /usr/src/linux/.config | grep RTC
CONFIG_HPET_EMULATE_RTC=y
CONFIG_RTC=y
CONFIG_SND_RTCTIMER=m
CONFIG_SND_SEQ_RTCTIMER_DEFAULT=y
CONFIG_RTC_LIB=y
CONFIG_RTC_CLASS=y
CONFIG_RTC_HCTOSYS=y
CONFIG_RTC_HCTOSYS_DEVICE="rtc0"
# RTC interfaces
CONFIG_RTC_INTF_SYSFS=y
CONFIG_RTC_INTF_PROC=y
CONFIG_RTC_INTF_DEV=y
# RTC drivers
# CONFIG_RTC_DRV_X1205 is not set
# CONFIG_RTC_DRV_DS1672 is not set
# CONFIG_RTC_DRV_PCF8563 is not set
# CONFIG_RTC_DRV_RS5C372 is not set
# CONFIG_RTC_DRV_M48T86 is not set
# CONFIG_RTC_DRV_TEST is not set
=======================================================

How should I change it?  What's the point (from a laptop user's point of 
view)?
-- 
Regards,
Mick

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Re: [gentoo-user] RTC, is it needed?

[Richard Fish]

On 9/25/06, Mick <michaelkintzios@gmail.com> wrote:
> Hi All,
>
> Not sure if I need RTC built in my kernel.  This is the error I get when I
> boot up:

The PC rtc is used by some applications (fex: vmware) to provide a
timer interval greater than the system timer interval.  If your system
has an rtc, it is generally a good idea to enable it...

> =======================================================
> # dmesg | grep -i RTC
> Using IPI Shortcut mode
> drivers/rtc/hctosys.c: unable to open rtc device (rtc0)

Hmm, looks like you enabled RTC class and the "Set system time from
RTC on startup" options.  This you almost certainly do not need, as it
is really for external real-time clocks that plug in....so unless you
are running a stratum 1 timeserver, you don't need this.

> CONFIG_HPET_EMULATE_RTC=y
> CONFIG_RTC=y
> CONFIG_SND_RTCTIMER=m
> CONFIG_SND_SEQ_RTCTIMER_DEFAULT=y

All ok...

> CONFIG_RTC_LIB=y
> CONFIG_RTC_CLASS=y
> CONFIG_RTC_HCTOSYS=y
> CONFIG_RTC_HCTOSYS_DEVICE="rtc0"

But these are not needed.

-Richard
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] RTC, is it needed?

[Mick]

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On Tuesday 26 September 2006 04:55, Richard Fish wrote:

> > CONFIG_RTC_LIB=y
> > CONFIG_RTC_CLASS=y
> > CONFIG_RTC_HCTOSYS=y
> > CONFIG_RTC_HCTOSYS_DEVICE="rtc0"
>
> But these are not needed.

Thank you Richard!  Grateful as always.  :)
-- 
Regards,
Mick

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