Subject: Re: proposal for changes to todr interface
To: None <>
From: Izumi Tsutsui <>
List: tech-kern
Date: 09/07/2006 02:13:40 wrote:

> On Thu, Sep 07, 2006 at 01:40:53AM +0900, Izumi Tsutsui wrote:
> > I don't think any driver requires rtc_offset adjustment,
> > but the machine itself (or maybe other OSes on it) needs
> > adjustment on reading/storing time regardless of its rtc chip.
> Does the i8254 used e.g. in PCs have a DST flag? That should be
> supported by the common infrastructure.

Note i8254 is a interval timer chip, not a todclock chip.
As you can see x86/isa/clock.c, tod is stored in mc146818

Anyway, our old code didn't seem to handle the DSE bit on it.
(and I don't know if DOS or Windows uses it)
Izumi Tsutsui