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Date: Thu, 11 Mar 2010 21:21:37 +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 03/11/10 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. > > Datasheet: > http://www.penguin.cz/~utx/zaurus/datasheets/power/Xscale/ISL6271.pdf Unless there's more to it in the way the zaurus using it that regulator isn't programmable digitally. Reading about your CF Card WLAN related issues they suck down a good amount of power when their radio is up, I would definitely suggest monitoring with a 'scope the various rails (Vcore, RAM and whatever it is the CF Card is powered by) while putting it under load. -Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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