Another intersting behaviour of the SD, USB and SSD also is the write deadlocks : see few attempts to get explain at my fastbench page [1].
Regards, [1] https://doukki.net/doku.php?id=wiki:tutoriels:fastbench Le 24/08/2012 14:42, Laurent Lesage a écrit : > Thank you all for your opinion and experiences. > > I confirm that I got nearly all the problems described by some of you : > -some SD card work, some don't. > -when they work, they have slower access than USB sticks. > -when they works, it happens that they suddenly become "read-only". The > system continue to work but with lots of delays (of course, when the > "disk" is RO, processes accessing the disk are "waiting" and the CPU > uses more than 90% "waiting") - I don't know how it can continue worling > but it does! > -The sd card I could'nt restart finally works (I used another PC to > write on it - it seems that the SD slot of my netbook is not that > good.... I used an usb multifunction docking station for SATA/SD/MS, TF > cards, and it seems to get better results when wirintg to SD cards). > -I got a (not cheap) USB stick burned with the sheeva plug after a power > outage. I got another one (a cheap one, not surprising) burned and > terribly hot after a few days. > > I also read that there was a patch for the kernel to use the SD cards, > but, as said, using the new DENX uboot, didn't make the things better - > and this seems to mean that this "driver" is not good enough to rely on. > > As my sheeva is used as pbx, I must be able to rely on it. So I've > bought a SATA SSD 32Go NAND flash disk and a box to connect it to USB. > It is 2x the price but for 30 euros more, I should gain a few hours of > time and have a really reliable system. I have systems running in Africa > and it would be difficult for me to get the usb console from there... I > will test the solution and I think I will change the usb keys on all the > sheeva's running... > > I'll keep the list informed ... > > thanks again > > -- > Laurent Lesage > > > > DrEagle a écrit : >> Le 23/08/2012 21:00, mick a écrit : >> >>> On Wed, 22 Aug 2012 16:10:14 -0700 >>> Rick Thomas <rbtho...@pobox.com> allegedly wrote: >>> >>> >>>> There have been persistent reports of flaky results with SD cards on >>>> Sheeva (and other) Plug devices. The best theory I've heard so far >>>> is that the SD interface hardware/software in the Plugs is vey picky >>>> about the specs and timing of the SD card interface. Many people >>>> have no problems for years, but if you happen to pick a card from a >>>> slightly out-of-spec batch, you will have no end of intermittent >>>> problems. >>>> >>>> Why not just go back to using a USB flash stick? >>>> >>>> Rick >>>> >>>> >>> I had persistent problems with SD cards when I first bought a >>> sheevaplug back in 2010. (See http://baldric.net/2010/03/30/unplugged/ >>> for example). My problems only disappeared when I moved to using a >>> (powered) USB disk as boot and filesystem. >>> >>> Mick >>> >> >> The master problem about SDHC/MMC is that the driver is a quick >> adaptation of the Marvell U-Boot for denx u-boot. >> It's not ported, nor maintained and not very tested by Marvell and >> community. >> >> I wrote it a few time ago to get the basic SDHC/MMC support into denx >> u-boot, but the code is still buggy. >> >> In my opinion, the mvsdio driver from Linux kernel might be ported to >> denx to be mainline. I do not get it working for now... >> >> The code for sdio driver from marvell u-boot was buggy and was just >> ported without debugging. >> >> It might work, might not. >> >> The best method is to use NAND, USB stick are not fast enough and may be >> broken also (I have a USB key drop unwritable after using it with a >> sheevaplugs). >> May be it is bug free now, with the latest git denx u-boot. >> >> The IDE (SATA) for kirkwood from the git denx u-boot is now bugless and >> fast enough to use in production with eSATA Sheevaplug and Kirkwood NAS >> base. >> --- >> DrEagle >> -- To UNSUBSCRIBE, email to debian-arm-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/50378101.8070...@doukki.net
