Date: Mon, 10 Oct 2011 09:45:03 +0000 From: Matthieu Kraus <matthieu.kraus@s2008.tu-chemnitz.de> To: Mattia Rossi <mrossi@swin.edu.au> Cc: freebsd-arm@freebsd.org Subject: Re: Create FAT partition/filesystem on the internal microSD flash of the Dreamplug Message-ID: <cone.1318239903.356917.1719.500@rlydontknow> References: <4E9290FF.7090306@swin.edu.au>
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Mattia Rossi writes: > Hi all again, > > I've now been on to this for quite a while, but just can't get it to work. > I've mistakenly blown away the partitioning scheme that the dreamplug > came with originally, therefore also the FAT boot partition. > > I've tried to recreate it using gpart and newfs_msdos, but can't create > any new FAT partition that mount_msdosfs would mount. > > See: > > dreamplug# gpart create -s mbr da0 > da0 created > dreamplug# gpart add -t fat32 -i 1 -s 32M da0 > da0s1 added > dreamplug# newfs_msdos da0s1 > /dev/da0s1: 65416 sectors in 8177 FAT16 clusters (4096 bytes/cluster) > BytesPerSec=512 SecPerClust=8 ResSectors=1 FATs=2 RootDirEnts=512 > Sectors=65520 Media=0xf0 FATsecs=32 SecPerTrack=63 Heads=255 HiddenSecs=0 > dreamplug# mount_msdosfs /dev/da0s1 /mnt/usb > mount_msdosfs: /dev/da0s1: Invalid argument > > I've tried to change the partition type to 6 and 4 and to freebsd (165), > but didn't help. > I also tried to set the start of the partition (-b) to 64, 128 and 192 > but nothing there either. > > Trying to tune newfs_msdos to use FAT 12 or FAT 32 and different > bytes/sec or a different mediatype (0xf8) and a variety of tweaks did > not help either. > > It seems that I can't create a mountable FAT partition. > > I believe the problem is that gpart create -s mbr starts the > partitioning scheme at an offset of 63 sectors, while the one on the > external SD card I have (pre-partitioned not using FreeBSD) has an > offset of 32 sectors. > > I couldn't find any documentation that tells me how to tell gpart create > to use a different offset. > > Any hints? > > Mat that's another issue I ran into, however I fixed it the "dirty" way: for some mysterious reason mkfs_msdosfs seems to be a little broken, so I just created the filesystem with a linux and from there on everything worked fine (the msdosfs created under linux can be mounted without issues using mount_msdosfs)
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