Date: Thu, 15 Nov 2012 20:10:10 +0100 From: Matthias Apitz <guru@unixarea.de> To: Fernando =?iso-8859-1?Q?Apestegu=EDa?= <fernando.apesteguia@gmail.com> Cc: Mike Clarke <jmc-freebsd2@milibyte.co.uk>, freebsd-questions@freebsd.org Subject: Re: Mounting SD card. Message-ID: <20121115191009.GA1191@tiny.Sisis.de> In-Reply-To: <CAGwOe2Y1FhCWM7=3EFj%2BLOYt2o1eDFMY0_yaBJbod6grTovV1A@mail.gmail.com> References: <CAGwOe2bDa2rYpVie3L_E-6=d%2B9uKkoeOHJE9bboAivM5X5rWhw@mail.gmail.com> <201211142058.18913.jmc-freebsd2@milibyte.co.uk> <alpine.BSF.2.00.1211141904580.57127@wonkity.com> <CAGwOe2Y1FhCWM7=3EFj%2BLOYt2o1eDFMY0_yaBJbod6grTovV1A@mail.gmail.com>
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El día Thursday, November 15, 2012 a las 05:57:45PM +0100, Fernando Apesteguía escribió: > On Thu, Nov 15, 2012 at 3:06 AM, Warren Block <wblock@wonkity.com> wrote: > > On Wed, 14 Nov 2012, Mike Clarke wrote: > > > >> On Wednesday 14 November 2012 19:43:30 Fernando Apesteguía wrote: > >> > >>> If I boot the system and plug the SD card in, the green led > >>> doesn't even switch on and there is only a /dev/da0 that I can not > >>> mount. If I boot the system with the card plugged in, the green led is > >>> on and there is a /dev/da0s1 device that I can't still mount because > >>> mount_msdosfs returns an Input/Output error after some time. > >> > >> > >> I think that's pretty much standard behaviour. The solution appears to be > >> to "wake" it up with the following incantation: > >> > >> dd if=/dev/null of=/dev/da0 count=0 > >> > >> That's what works here. See the thread starting with > >> > >> <http://lists.freebsd.org/pipermail/freebsd-questions/2010-February/212109.html>; > > > > > > true > /dev/da0 > > That doesn't work for me, but the dd operation does. What can be the difference? Both commands open the file /dev/da0 for: open("/dev/da0",O_WRONLY|O_CREAT|O_TRUNC,0666) = 3 without writing any myte to it; you can proof this with: # truss dd if=/dev/null of=/dev/da0 count=0 and # truss sh <<EOF true > /dev/da0 EOF matthias -- Sent from my FreeBSD netbook Matthias Apitz | - No system with backdoors like Apple/Android E-mail: guru@unixarea.de | - No HTML/RTF in E-mail WWW: http://www.unixarea.de/ | - No proprietary attachments phone: +49-170-4527211 | - Respect for open standards
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