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From: Pavel Machek on 21 Mar 2010 16:50 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 -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Pavel Machek on 21 Mar 2010 16:50 On Mon 2010-03-08 12:48:36, Stanislav Brabec wrote: > Cyril Hrubis wrote: > > > Well I've seen empty lines when editing file with vim > > And I have seen: > > - Unreproducible SIGSEGV of gcc (while Wi-Fi connection over CF card was > running). > - Unreproducible SIGSEGV of opkg (downloading via Wi-Fi connection over > CF card). > - Unreproducible SIGSEGV of rm (called from find command launched via > ssh, networking via Wi-Fi connection over CF card). > (Hint: Tasks above are HDD-intensive.) > - Lost blocks while copying from CF to SD. > - Lost blocks while copying from HDD to SD. > - Lost blocks while copying from CF to USB flash stick. > - And I see display noise while CF Wi-Fi card is active. > > These problems appear in all kernels, at least since 2.6.26. > > There is no note in the syslog. Interesting, I get memory corruption leading to strange behaviour. Sometimes echo 3 > /proc/sys/vm/drop_caches helps... Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Stanislav Brabec on 21 Mar 2010 17:50 Pavel Machek p�e 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). Alternatively, it is possible to write a driver. It is just one byte write and one byte read via I2C. ________________________________________________________________________ Stanislav Brabec http://www.penguin.cz/~utx/zaurus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Pavel Machek on 29 Mar 2010 14:30 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Stanislav Brabec on 29 Mar 2010 14:50 Pavel Machek wrote: > > 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... Yes, it should be easy driver. One byte address and then one byte write or one byte read. See the datasheet: http://www.penguin.cz/~utx/zaurus/datasheets/power/XScale/ISL6271A.pdf Page 11: address Pages 8 and 9: Data interpretation -- Stanislav Brabec http://www.penguin.cz/~utx/zaurus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.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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