Date: Tue, 28 Dec 2010 01:26:44 +0100 From: Polytropon <freebsd@edvax.de> To: Adam Vande More <amvandemore@gmail.com> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: SD/CF card reader Message-ID: <20101228012644.03ded464.freebsd@edvax.de> In-Reply-To: <AANLkTi=O8KWOz-J85FzB7giDUtwtkDbhq-B8LKAiQP47@mail.gmail.com> References: <20101227004708.c2d02d15.freebsd@edvax.de> <AANLkTikQHoDsDxx30joFa3guNSCiJ_EJuEZV5zLhk=b1@mail.gmail.com> <20101227013359.434b743d.freebsd@edvax.de> <AANLkTik1SrAp_ySW3_GX_8rPQU4%2BWEJe=hHdJKgr6hVS@mail.gmail.com> <20101227020125.9ab1a07f.freebsd@edvax.de> <AANLkTi=O8KWOz-J85FzB7giDUtwtkDbhq-B8LKAiQP47@mail.gmail.com>
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On Sun, 26 Dec 2010 19:35:20 -0600, Adam Vande More <amvandemore@gmail.com> wrote: > My understanding is that USB devices can only respond to information > requests, not broadcast changes so that is why nothing is in dmesg > indicating new media has been inserted. Yes, polling instead of interrupt-driven announcements, this is what I understood, too. I did assume some kind of polling mechanism inside the kernel (or *by* the kernel) that would poll the "drive bays" of the SD/CF card reader to see when they contain media. Still the method of issuing something like # true > /dev/da1 looks wrong - even if it works. It looks like: "And now we are overwriting the whole memory card with... erm... with the truth, but at least we're overwriting it." This just gives me a scary impression. There should be something more "correct", such as resetting some bus via camcontrol or re-reading a structure via usbdevs, but no > access to the whole card. > > GEOM: da1: partition 1 does not start on a track boundary. > > GEOM: da1: partition 1 does not end on a track boundary. > > GEOM: da1: partition 1 does not start on a track boundary. > > GEOM: da1: partition 1 does not end on a track boundary. > > > Yeah I don't know about that. I think it's just a warning but maybe trying > using FreeBSD zero out device, partition(slice) and newfs_msdos it. Those messages seem to be uncritical as I've tried to access various media - without any problems. Those cards work well on my v7 system (where those messages aren't shown). I just continue as if those messages haven't been issued. > dd if=/dev/zero of=/dev/da0 bs=512k count=10 > fdisk -i /dev/da0 > newfs_msdos -F32 /dev/da0s1 But that will remove the content of the cards! :-) -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ...
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