[uClinux-dev] Re: Not getting a good CF-image with Snapgear-3.3...

[David McCullough]

Jivin Evert lays it down ...
> Hi all!
> David McCullough wrote:
> >Jivin Evert lays it down ...
> >>Hi all!
> >>
> >>I'm trying to build a usable Snapgear install, but am running into 
> >>problems at the end when the CF-image is being assembled. Looks like the 
> >>mbr generated is not complete/valid.
> >
> >This would be more appropriately posted on the uClinux-dev list.
> 
> Thanks for the tip. I will continue my quest there!  :-)
> 
> >>Here's some output:
> >>
> >>>dd if=/dev/zero of=mbr.img bs=512 count=1
> >>>1+0 records in
> >>>1+0 records out
> >>>echo -e "1,121343,L,*\n,,61,-" | sfdisk -uS -C 490 -H 8 -S 32 mbr.img
> >>>Warning: mbr.img is not a block device
> >>>Disk mbr.img: cannot get geometry
> >>>
> >>>Disk mbr.img: 490 cylinders, 8 heads, 32 sectors/track
> >>>
> >>>sfdisk: seek error: wanted 0x0000000000000000, got 0x0000000000000000
> >>>mbr.img: unrecognized partition table type
> >>>Old situation:
> >>>No partitions found
> >>>New situation:
> >>>Units = sectors of 512 bytes, counting from 0
> >>>
> >>>  Device Boot    Start       End   #sectors  Id  System
> >>>mbr.img1   *         1    121343     121343  83  Linux
> >>>mbr.img2        121344    125439       4096  61  SpeedStor
> >>>mbr.img3             0         -          0   0  Empty
> >>>mbr.img4             0         -          0   0  Empty
> >>>
> >>>sfdisk: seek error: wanted 0x0000000000000000, got 0x0000000000000000
> >
> >This is the problem I guess,  everything else looks about right.  Why I
> >don't understand is that the error is complaining that it got what
> >it wanted :-)
> >
> >What version of sfdisk do you have installed ?  Can you try a different
> >version ?
> 
> I use the following version:
> sfdisk version 3.08 (aeb at cwi.nl, 040824) from util-linux-2.12r

Thats the same version I have on my system.

Are you running a 64bit OS by any chance ?

> This is the one that comes with Gentoo Linux (stable). Are there any known 
> problems with this version? If so, which newer (or older?) version should I 
> go for instead?

Try running the commands by hand,  try strace on them and see what is being
returned.

Could be a problem with the fdisk source and the way it implements
llseek.  You could use the source from uClinux-dist/user/fdisk to 
see if you find why it is going bad.

Cheers,
Davidm

> >>>Re-reading the partition table ...
> >>>BLKRRPART: Inappropriate ioctl for device
> >>>
> >>>If you created or changed a DOS partition, /dev/foo7, say, then use dd(1)
> >>>to zero the first 512 bytes:  dd if=/dev/zero of=/dev/foo7 bs=512 count=1
> >>>(See fdisk(8).)
> >>>make[4]: *** [extimage] Error 1
> >>>make[4]: Leaving directory `/home/evert/Snapgear/vendors/Soekris/net4801'
> >>>make[3]: *** [extimage-64MB] Error 2
> >>>make[3]: Leaving directory `/home/evert/Snapgear/vendors/Soekris/net4801'
> >>>make[2]: *** [image] Error 2
> >>>make[2]: Leaving directory `/home/evert/Snapgear/vendors/Soekris/net4801'
> >>>make[1]: *** [image] Error 2
> >>>make[1]: Leaving directory `/home/evert/Snapgear/vendors'
> >>>make: *** [image] Error 2
> >>
> >>As you can see I am aiming at a 64MB CF on a Soekris(-compatible) system.
> 
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-- 
David McCullough,  david_mccullough at securecomputing.com,   Ph:+61 734352815
Secure Computing - SnapGear  http://www.uCdot.org http://www.cyberguard.com