linux-kernel - Re: bit errors on spitz

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Date:	Fri, 12 Mar 2010 09:33:37 +0000
From:	Andy Green <andy@...mcat.com>
To:	Stanislav Brabec <utx@...guin.cz>
CC:	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>,
	Pavel Machek <pavel@....cz>, thommycheck@...il.com,
	zaurus-devel@...ts.linuxtogo.org, omegamoon@...il.com
Subject: Re: bit errors on spitz

On 03/12/10 09:07, Somebody in the thread at some point said:

>> Unless there's more to it in the way the zaurus using it that regulator
>> isn't programmable digitally.
>
> OOPS, I made a mistake and linked ISL6721 instead of ISL6271 there.
> Now it is fixed:
> http://www.penguin.cz/~utx/zaurus/datasheets/power/XScale/ISL6271A.pdf
>
> This one has I2C. It is connected to GPIO 3 (PWR_SCL) and GPIO 4
> (PWR_SDA).

Thanks... that defaults to 1.3V on Vcore if you don't touch it.  I guess 
confirm on the CPU datasheet that it's OK for your selected CPU clock speed.

> I guess that Zaurus has a good power design and that voltage should be
> constant enough. CF has a dedicated step down (plus 2.8V power detector

In that case is the PXA CF driver PIO?  Then it can be the same load on 
Vcore issue in disguise.

-Andy
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