linux-kernel - Re: bit errors on spitz

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Message-ID: <20100321204335.GM1933@elf.ucw.cz>
Date:	Sun, 21 Mar 2010 21:43:36 +0100
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 Fri 2010-03-12 10:07:04, Stanislav Brabec wrote:
> Andy Green wrote: 
> > On 03/11/10 15:42, Somebody in the thread at some point said:
> > > Andy Green wrote:
> > >
> > >> I saw very similar failures for a long time on our iMX31 based device.
> > >> Eventually I found a Freescale errata where the RAM inside the USB2
> > >> macrocell started to make single bit errors below 1.38V Vcore; ours was
> > >> 1.4V at that time but dipped on CPU load.
> > >
> > > 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?

								Pavel

-- 
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