linux-kernel - Re: bit errors on spitz

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Message-ID: <1268322155.3990.114.camel@hammer.suse.cz>
Date:	Thu, 11 Mar 2010 16:42:35 +0100
From:	Stanislav Brabec <utx@...guin.cz>
To:	Andy Green <andy@...mcat.com>
Cc:	Cyril Hrubis <metan@....cz>, Pavel Machek <pavel@....cz>,
	Eric Miao <eric.y.miao@...il.com>, dbaryshkov@...il.com,
	arminlitzel@....de, kernel list <linux-kernel@...r.kernel.org>,
	Dirk@...er-online.de, lenz@...wisc.edu, rpurdie@...ys.net,
	omegamoon@...il.com, thommycheck@...il.com,
	zaurus-devel@...ts.linuxtogo.org,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: bit errors on spitz

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.

Datasheet:
http://www.penguin.cz/~utx/zaurus/datasheets/power/Xscale/ISL6271.pdf

-- 
Stanislav Brabec
http://www.penguin.cz/~utx/zaurus

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