On Aug 23, 2014, at 12:00 PM, Craig Rodrigues <rodrigc_at_freebsd.org> wrote: > > I ran the following crazy experiment, just to see what would happen: > > dd if=/dev/md1s2 of=/dev/md0s2 bs=8192 > > I then tried to boot the first image with QEMU, and it booted successfully, > with my UFS file system that I had previously created with makefs. > > I'm not sure where to look for the problem. I notice that > in the non-working image, the offset starts at block 3, > while in the working image, the offset starts at block 34. > > Is that enough to make things not boot? Could be. Try the -P option to mkimg. It sets the underlying (unexposed) physical sector size while still working with the visible 512 bytes sectors. The net effect is that for the GPT scheme things get aligned to the physical sector size and that it also causes the image size to be rounded. You can also try emitting vmdk directly to see if that makes a difference. vmdk also has the side- effect of rounding the image to the grain size. -- Marcel Moolenaar marcel_at_xcllnt.net
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