Date: Fri, 27 Sep 2013 19:11:43 +0200 From: Bernd Walter <ticso@cicely7.cicely.de> To: Martin Laabs <mailinglists@martinlaabs.de> Cc: freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: Raspberry PI sporadically fails to mount mmc card Message-ID: <20130927171142.GB82284@cicely7.cicely.de> In-Reply-To: <20130927170246.GA82284@cicely7.cicely.de> References: <521D92CA.8050008@martinlaabs.de> <20130927170246.GA82284@cicely7.cicely.de>
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On Fri, Sep 27, 2013 at 07:02:47PM +0200, Bernd Walter wrote: > On Wed, Aug 28, 2013 at 08:03:54AM +0200, Martin Laabs wrote: > > Hi, > > > > Sporadically the raspberry pi fails to mount its root mmc card. After power > > off and power on again it works most of the time. However there seem to be > > also configurations that fail permanently. Unfortunately I have no image of > > a sd card that fails on every boot. > > I see a similar very strange thing. > > 6 Raspi (256MB Eth Version) bought at the same time from same batch. > 6 identic 8GB Transcent SD cards bought at the same time and likely > also same batch. > > Used one card to copy crochet build image from r255729 source. > Booting fine, but identified as 1bit: > mmcsd0: 8GB <SDHC 00000 1.0 SN 16361806 MFG 06/2012 by 27 SM> at mmc0 25.0MHz/1bit/65535-block > On reboot it fails, but works on next boot without power down. > > I'd tuned the installation and copy'ed the card to the 5 others. > None of the others were booting in the other raspi boards, but the > original card still worked in the original raspi. > All systems are running with power from same USB-hub. > Then I'd placed the working card in anther raspi and it failed as > well: > mmcsd0: 8GB <SDHC 00000 1.0 SN 16361806 MFG 06/2012 by 27 SM> at mmc0 50.0MHz/4bit/65535-block > mmcsd0: Error indicated: 1 Timeout > However it is probed with 4bit and higher bitrate. > This must be a very marginal problem when identic systems either > work or not. > Since the working condition is probed as 1 bit I wonder if there > is a generel 4 bit problem and addtional this single combo probes > wrong as 1 bit? Another combo is working. This time with 4bit and 25MHz: mmcsd0: 8GB <SDHC 00000 1.0 SN 30365657 MFG 06/2012 by 27 SM> at mmc0 25.0MHz/4bit/65535-block -- B.Walter <bernd@bwct.de> http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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