Re: [linuxsh-dev] [PATCH:] Enhanced RTC Support

[M. R. B. <mrb...@0x...>]

* SUGIOKA Toshinobu <su...@it...> on Mon, Apr 23, 2001:

> At 15:28 01/04/23 +0900, NIIBE Yutaka wrote:
> >I know that this is the way of handling SH's RTC in the manual, but we
> >could implement rtc_is_updating, such as checking R64CNT is near 0 or
> >not (with some safety).  Errr... well, the implementation depends on
> >architecture, SH-3 or SH-4.
> 
> OK, I removed the change of drivers/char/rtc.c ,
> and added RTC_UIP (RTC updating) bit emulation
> as your suggestion.
> 
> I tested RTC_RD_TIME ioctl function several hundred million times,
> and found no errors. It seems that RTC_UIP bit works fine on SH7709A.
>

There is a problem from my standpoint - this has no hope of working on the
Dreamcast, which is a SH7750 (mostly) *without* a working RTC.  This was the
reason Philip Rumpf and NIIBE added the mv_rtc_{get,set}timeofday functions
to the machvec.  Actually from the LinuxDC side, I have implemented the DC
RTC routines (there on the sound chip) and there in the merge that I can
hopefully finish and commit this afternoon.

What I'm saying is it'd be infinitely cooler to implement this using the
machvec routines, where you would never have a problem with compatibility.
I had actually starting thinking a bit about this, if you give me a day or so
I can try to get a patch for review.

M. R.