I can't speak to the howto, as it depends on GRUB and Yaifo.
Quote:
...Any ideas are welcome...
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I'd do a standard installation of OpenBSD in a virtual machine under Ubuntu, attaching the second hard drive (/dev/hd1) to the VM.
Here's an example for Ubuntu, using qemu. Replace <whatever> with the raw device node for /dev/hd1. I don't use Linux often enough to know what that is:
# qemu -boot d -cdrom cd44.iso <whatever>
Let the standard install run, creating the MBR and installing the OS on the device. Then modify your GRUB configuration to allow a boot of the second hard drive. I can't guide you for that, as I don't speak Grubbish. If you let the install script "dedicate the drive to OpenBSD" the MBR will have a single active partition in the last slot (#3 if you use partitions 0-3, or #4 if you use partitions 1-4).