[rtc-linux] Re: state of GEN_RTC vs rtc subsystem

[Alessandro Zummo]

On Wed, 20 Feb 2008 15:37:28 -0500
woodys <woodys at xandros.com> wrote:

> On ARM genrtc has been arbitrary disabled in Kconfig circa 2.6.19 and 
> the change to rtc_cmos it is not 100% transparent (ARM Netwinder, Debian).
> If I want to use a current (Etch) hwclock binary - I need genrtc with 
> /dev/rtc at 10,135, however new rtc_cmos creates /dev/rtc0 at 254,0.
> As a result on new kernels hwclock claims that it is not able to access 
> hardware.
> 
> However upgrading the util-linux package will (sometime in the 
> "unstable" future) solve it, so it is not completely broken... Still, at 
> the moment - genrtc seems to be a better solution...

 Strange that it has been disabled, I used to keep an eye to avoid touching
 anything outside of drivers/rtc .

 the rtc subsystem creates the device dynamically, you shouldn't count
 on having 254,0. I would eventually ack a patch that adds
 /dev/rtc at 10,135 as an alias for /dev/rtc0.

 however the best solution would be to upgrade hwclock.


-- 

 Best regards,

 Alessandro Zummo,
  Tower Technologies - Torino, Italy

  http://www.towertech.it