X-Recipient: archive-cygwin@delorie.com X-Spam-Check-By: sourceware.org Date: Thu, 5 Mar 2009 17:34:55 +0100 From: Corinna Vinschen To: cygwin@cygwin.com Subject: Re: Raw device access to an SD card Message-ID: <20090305163455.GA14059@calimero.vinschen.de> Reply-To: cygwin@cygwin.com Mail-Followup-To: cygwin@cygwin.com References: <83zlg0otp4.fsf@kalahari.s2.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <83zlg0otp4.fsf@kalahari.s2.org> User-Agent: Mutt/1.5.19 (2009-02-20) Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com On Mar 5 17:49, Hannu Koivisto wrote: > Greetings, > > The goal is to create a bootable Linux installation on an SD card > by writing an existing image using dd in Cygwin. The card is > inserted to an SD card slot of a laptop and apparently appears as > \\.\physicaldrive2 to the OS. > > Now, "dd if=\\\\.\\physicaldrive2" reads something (hopefully from > that card, hard to say for sure) but an attempt to write with "dd > if=image of=\\\\.\\physicaldrive2" fails with "Invalid argument" > error. Should this work? Not really. Don't use Windows device names. You can find the mappings from POSIX device names to Windows device names here: http://cygwin.com/1.7/cygwin-ug-net/using-specialnames.html#pathnames-posixdevices In your case that would be /dev/sdc. But that probably won't work. I don't remember the exact details, but you shoudl rather access the first partition on the device, rather than the entire device. like this: /dev/sdc1 > first? I tried "mount -f -b //./physicaldrive2 /dev/foo" as > suggested by someone but according to the Cygwin user's guide that > is deprecated and besides, /dev/foo behaved just like > \\\\.\\physicaldrive2 directly. FWIW, I tried to find if the card Yep. > device gets mapped to some /dev/sd? but that didn't seem to be the > case. Only /dev/sda was available (hard drive). Is it possible to > list that kind of mappings somehow? cat /proc/partitions Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/