linux-kernel - Re: bit errors on spitz

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Message-ID: <20100329182736.GA1373@ucw.cz>
Date:	Mon, 29 Mar 2010 20:27:36 +0200
From:	Pavel Machek <pavel@....cz>
To:	Stanislav Brabec <utx@...guin.cz>
Cc:	Andy Green <andy@...mcat.com>, Eric Miao <eric.y.miao@...il.com>,
	dbaryshkov@...il.com, Cyril Hrubis <metan@....cz>,
	arminlitzel@....de, kernel list <linux-kernel@...r.kernel.org>,
	Dirk@...er-online.de, lenz@...wisc.edu, rpurdie@...ys.net,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	thommycheck@...il.com, zaurus-devel@...ts.linuxtogo.org,
	omegamoon@...il.com
Subject: Re: bit errors on spitz

On Sun 2010-03-21 22:42:33, Stanislav Brabec wrote:
> Pavel Machek píše v Ne 21. 03. 2010 v 21:43 +0100:
> > On Fri 2010-03-12 10:07:04, Stanislav Brabec wrote:
> 
> > > > > Good tip. It seems that nobody ported driver for the voltage control
> > > > > chip ISL6271 from 2.4 kernel, and bootloader probably does not set
> > > > > correct values.
> > 
> > Are we sure about this one? If we have wrong voltages on various
> > parts, that kind-off explains it.
> > 
> > Would it be possible to measure (Voltmeter) difference between 2.4
> > kernel and 2.6 kernel?
> 
> If you are ready to run Zaurus in dismantled state, then yes. Measure on
> the upper pin of the large coil in the center of the
> http://www.penguin.cz/~utx/zaurus/pcbt_uc.jpg image or on the testpoint
> nearby (probably to the right).

I'm not comfortable dismantling it :-(.

> Alternatively, it is possible to write a driver. It is just one byte
> write and one byte read via I2C.

Do you know what byte it is? That sounds easy enough...

But I have small problem now -- zaurus seems to work mostly fine
now. Does it depend on temperature, or what? Tried mtest,
nothing. Tried compiling kernel, ok... Will try few more times...

								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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