On Tue, 2010-12-07 at 15:33 +0000, Dave Martin wrote: > Hi, > > On Tue, Dec 7, 2010 at 3:10 PM, Robert Nelson <robertcnel...@gmail.com> wrote: > > Hi Guilherme, > > > >> I know you found a workaround with fdisk so you're probably no longer > >> using parted, but I was wondering if you were able to use parted to > >> change the geometry in the partition table to 255heads/63sectors as the > >> boot rom seems to require? > > > > Actually with current x-loader/u-boot the 255heads/63sectors isn't a > > hard requirement anymore for the boot partition, so i've dropped it.. > > > > https://github.com/RobertCNelson/omap-image-builder/blob/master/tools/setup_sdcard.sh#L348 > > > > So far tested on: > > > > Beagle B6 (oldest still booting beagle i have, any boards before that > > had serial-ic overheating problems and eventually die under warrente.) > > Beagle C2 & C4 > > Beagle xM A2 > > > > with angstrom's: MLO-beagleboard-1.44+r16 & u-boot-beagleboard-2010.03+r65 > > > > Panda A1 > > > > with mlo/u-boot from: http://gitorious.org/pandaboard > > > > So right now i use parted to create the second partition. We could > > drop fdisk for the first, if we could figure out how to make parted > > create a partition starting at the first cylinder. > > > > For example, I've tried this and it doesn't boot: > > > > parted --script ${MMC} mkpart primary fat16 0 64 > > > >> I ask because I'm working on converting our script to python and it'd be > >> nice if I could use python-parted for that, but it doesn't seem to be > >> able to. > > What about sfdisk? This is by far the simplest tool and works well > for parts of linaro-media-create: by direct consequence of its > simplicity it seems to be the most controllable and has the fewest > unexpected limitations and failure modes among the tools I've played > with, as well as being friendly to being program-driven. For manually > generating an optimal partition layout for Beagles I've also found > this the best tool to use.
sfdisk works indeed, but it'd be nicer if I could use a python library since I'm converting the whole script. The python-parted API is crap and undocumented, though, so I'll stick to running sfdisk in a subprocess. > > Certainly it's horrible to have to use a different partitioner to > create each partition... Yeah, I was not planning to do that, although we currently use parted to create a fresh partition table. It'd be nice if we could use sfdisk to do that, but I don't think we can? > > sfdfisk works well for me though, e.g.: > > S=63; H=255 > BC=5 > cat <<EOF | sfdisk -S63 -H255 -C523 -L -uS <device> > $S,$((5*BC*S-S)),0xc,* > $(((5*BC*S+2047)/2048*2048)) > EOF > > ...will set up by 4GB card a treat, with a working boot partition and > an aligned filesystem partition, with the CHS fields for the first > partition filled in correctly: > > 00000000 80 01 01 00 0c fe 3f 04 3f 00 00 00 86 39 01 00 > 00000010 00 19 15 05 83 2a a0 0a 00 40 01 00 00 c0 7e 00 > 00000020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 00000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > > (BC is the number of cylinders for the boot partition. The only > constraint here is that the partition must be unambiguously FAT32, > i.e. > 65534 clusters -- which gives a minimum sector count of 66593. > 5 is simply (65593 + 63*255-1)/(63*255)) > > > Of course, the DOS partition table format is so trivial that if we're > having to jump through a lot of hoops, it's tempting to suggest we > could implement it ourselves (though I know I'm not supposed to say > that due to fragmentation etc., etc....) > > Cheers > ---Dave -- Guilherme Salgado <https://launchpad.net/~salgado>
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