Re: RTC time difference Linux vs. WM5

Hi,

Wes wrote:
> Now that we have proper dual boot (thanks again Tamas!) someone might
> actually be willing to start a winCE flash filesystem driver for linux.
> The format of the winCE flash fs isn't overly complex. Indeed there are
> quite a few tools around (largely thanks to xda-developers and the like)
> already to pull apart and reconstruct the flash images CE uses. A while
> ago I suggested the possibility of a Wine workalike for CE (and got
> called insane, crazy, and worse) Perhaps you're just crazy enough to
> kick such a project off Tamas?

Unfortunately, I feel I have no enough knowledge to do this :-(

/sza2

>
> Wes
>
>
> On 9/6/07, *Tamas Szabo* <klt29_at_freemail.hu <mailto:klt29_at_freemail.hu>>
> wrote:
>
> See below.
>
> Matt Reimer wrote:
> > On 9/4/07, Tamas Szabo <klt29_at_freemail.hu
> <mailto:klt29_at_freemail.hu>> wrote:
> >> Hello,
> >>
> >> There is 10 years of difference between Linux and WM5 clock
> (everybody
> >> has this problem?). It seems Linux count time from 1970-01-01
> while WM5
> >> count it from 1980-01-01 (try to set 1970-01-01 in WM5...).
> >>
> >> It does not matter whether boot natively or by HaRET (at least
> for me).
> >>
> >> I made a patch to rtc-sa1100.c (/drivers/rtc) which add/subtract ten
> >> years to/from time. However I am absolutely not sure that this is an
> >> exact solution.
> >>
> >> I am using the constant (10*365+3)*24*60*60. It seems to be
> correct in
> >> many cases, but maybe not always. I also applied this for alarm
> register.
> >>
> >> Of course I think Linux's clock management is the right one, but I
> >> cannot modify WM5 internals, so I chosen this way.
> >>
> >> Please take a look at the patch and feedback to me.
> >
> > Better would be to write a script to detect that WM5 had booted
> > previously and adjust the time, so those that run linux "natively"
> > (using sdgboot) won't be affected.
>
> Matt, maybe I can understand you or you cannot understand how the system
> works.
>
> At first, scripts can execute only after Linux already booted. However
> you may need to know the time earlier. It may cause undesirable side
> effects if you simply jump 10 years during other programs running.
>
> Second, this means in WM5 you need to store something in the flash and
> reading in Linux. This can be very tricky. There is (still) no WM5
> flash
> filesystem driver for Linux (am I right?).
>
> I also use SDG's boot loader, and run Linux "natively" (thanks to my
> bootldr patch:-)))
>
> I think it is better to keep the time in RTC and add a constant to
> it if
> necessary, than changing the value in the RTC chip every time you reboot
> in different OS.
>
> /sza2
>
> >
> > Matt
> >
> >
>
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Received on Fri Sep 07 2007 - 14:59:00 EDT