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Subject: Re: [2.5.63 PATCH][TRIVIAL]Change rtc.c ioport extend from 10h to 8h
From: Rusty Lynch <rusty@linux.co.intel.com>
To: root@chaos.analogic.com
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, p_gortmaker@yahoo.com,
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Date: 26 Feb 2003 11:42:30 -0800
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On Wed, 2003-02-26 at 11:35, Richard B. Johnson wrote:
> On 26 Feb 2003, Rusty Lynch wrote:
> 
> > The real time clock only needs 8 bytes, but rtc.c is reserving 10h bytes.
> [SNIPPED...]
> 
> It only needs two bytes port 0x70 and port 0x71 in ix86. Since the Sparc
> gets addressed differently and can only read/write words, it needs 8
> bytes.  Please, if you are going to fix it, please fix it only once by
> setting a different length for the different machines!
> Cheers,
> Dick Johnson

Actually, it's finer grain then x86, it's a chipset issue.  As Randy
pointed out in the original thread ==>
> Some Intel chipset specs list RTC as using 0x70 - 0x77, probably with
> some aliasing in there, so it looks to me like an EXTENT of 8 would be
> safer and still allow you access to 0x79.
> 
> I'm looking at 82801BA-ICH2, 82801-ICH3, and 82801AA-ICH0 specs.
> 
> -- 
> ~Randy
> 

Any suggestions on the right way of doing this?

   --rustyl

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