[Linux-ia64] RTC config option doesn't work for IA64 ?

[Linux-ia64] RTC config option doesn't work for IA64 ?

[Gerrit Huizenga]

Is it just me, or does the RTC config option not generate a
working kernel for the IA64 test4 kernel + david's 0714 patches?

It appears that at least a header file is missing, I don't know
what goes in it as yet:  asm-ia64/mc146818rtc.h

Basically compilation fails if the config option is turned on.

gerrit

Re: [Linux-ia64] RTC config option doesn't work for IA64 ?

[Stephane Eranian]

Hi,

> Is it just me, or does the RTC config option not generate a
> working kernel for the IA64 test4 kernel + david's 0714 patches?
> 
> It appears that at least a header file is missing, I don't know
> what goes in it as yet:  asm-ia64/mc146818rtc.h
> 
> Basically compilation fails if the config option is turned on.
> 
Normally you don't need to enable the CONFIG_RTC. You should enable
the CONFIG_EFI_RTC. Also in /dev you must have something like this:

crw-r--r--   1 root     root      10, 136 Apr  5 15:38 efirtc
lrwxrwxrwx   1 root     root            6 May  5 15:29 rtc -> efirtc

You can keep the legacy RTC under another name. With this in place,
the hwclock program should work seamlessly.

On the machines that we have, if I recall correctly, the legacy RTC is still
present but the code has never been tested. Anyway, DiG does not
guarantee the existence of such a timer. The only portable way is via EFI
runtime services.


-Stephane