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Solved: For some reason the CF cannot be booted from when connected to a UDMA Controller (HPT376). While I have no problems booting HDDs or other CF Images from that controller, Zeroshell fails, not even Grub shows up. As soon as I connected it to a regular IDE port it worked – but not after trying to boot from the UDMA controller because that obviously destroyed the boot sector, I had to dd the image again to the CF before booting from IDE.
That just applies to older mainboards that have separate UDMA-IDE controllers.