I've got the following in my preseed file:

d-i partman-auto/disk string /dev/sdc
d-i grub-installer/only_debian boolean false
d-i grub-installer/bootdev  string /dev/sdc

We've got two machines intended as Ceph OSD nodes, they've got two 3TB
HDDs on the two high-speed SATA ports and a 60GB SSD on a second.  Since
the SSD is mostly for the OS with the HDDs providing the bulk of the
I/O, this is meant the HDDs wound up as sda and sdb with the SSD being
called sdc.  The BIOS is set to boot sdc first, and the other two disks
will be initially unpartitioned so it's important that the boot-loader
winds up on sdc.

The above seems to do the trick.  I rather suspect the docs are a little
ambiguous, particularly with regards to the syntax used to specify
bootdev which looks like a relic of GRUB-legacy days.

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https://bugs.launchpad.net/bugs/1012629

Title:
  grub-installer ignores "bootdev" setting in preseed file

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