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Old 4 Weeks Ago
rdikarlus rdikarlus is offline
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Default Multiboot OpenBSD and Windows 10

Hi all,

I just purchased a new computer for work purposes with two hard drives, one with windows 10 pre loaded and second one I want to use to install OpenBSD on it. I must use windows 10 to run some engineering applications and I am an experienced OpenBSD user. I have experience in dual systems (linux) using GRUB and I used LILO many years ago. I realized there is no GRUB package for OpenBSD 64 bit, with your experience, what's the easiest and best boot manager to have a dual boot system OpenBSD and Windows 10?

Thanks,
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Old 4 Weeks Ago
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jggimi jggimi is online now
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I have a 2-disk laptop. Normal boot is OpenBSD, I boot Windows by using the BIOS/EFI alternate boot device table. On this Thinkpad, that just requires me to use F12 when I want to boot Windows.
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Old 4 Weeks Ago
shep shep is offline
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I've seen a number of favorable reports using rEFInd
rERInd Homepage

There is also a stand-alone install option for grub2
man grub-mkstandalone

The OpenBSD FAQ looks to lean toward rEFInd for Mac's - not sure about Win10.
OpenBSD FAQ multibooting

Not sure about bcdedit - the documentation is Win8 but the EasyBCD gui site says Win10/EFI support.
EasyBCD Website

I use grub2/linux or EFI/Bios and have no personal experience with the other options. Just based on my reading, I would tend to lean towards rEFInd. It seems to be widely used, has extensive documentation and Rod Smith has an internet trail of responding to problems/questions.
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I just select which drive to boot with via the bios, but neither drive have windows, the default drive, that boots normally is OpenBsd , but if I want to boot with the other, the "esp" key, gives me the boot selection, and I select the 2nd drive. The PC is a HP tower:
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OS: OpenBSD 6.5 amd64 
Host: Hewlett-Packard HP Compaq 8200 Elite CMT PC
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Old 4 Weeks Ago
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One easy solution is to install an OS on the inside HD, another OS on an external USB3 HD, setting USB boot as first boot, and then...
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rdikarlus rdikarlus is offline
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Finally I used EasyBCD. It works great and boots OpenBSD by default successfully

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Last edited by rdikarlus; 1 Week Ago at 06:40 AM.
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