Re: dual boot installation with UEFI

[Jeff <pacavegano%tutamail.com@localhost>]

Thank you so much for this information! I will read through your links, as well as the other replies, and will give this another try later today. I will take pictures of everything, so that if I experience problems again I can give the exact errors. 

Jeff
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Sep 25, 2026, 21:20 by trinity@tebibyte.media:

> On Fri Sep 25, 2026 at 7:06 PM MDT, Jeff wrote:
>
>> Hi, folks,
>>
>> I wish to install NetBSD into the unused space (or I can pre-format
>> it, if that would help) on a drive which already has a UEFI partition
>> and a partition on which Gentoo is installed, and I want to keep Gentoo
>> intact. I cannot find any instructions or tutorials regarding installing
>> on a disk that has another OS on it...
>>
>
> I did this. I created 2 new GPT partitions, swap and /, which were
> respectively 4GB and however much space was left after that, and they
> worked fine with the installer. If I recall correctly, the installer
> will install NetBSD into the ESP at ESP:/NetBSD/, but I installed rEFInd
> to triple boot with the existing Windows 10 and Linux Mint partitions. I
> did have trouble with booting NetBSD because my boot.cfg (which should
> be at ESP:/NetBSD/) was improperly formatted, and I described my
> configuration at the time here:
> <https://mail-index.netbsd.org/netbsd-users/2026/08/02/msg034580.html>
> and figured it out here:
> <https://mail-index.netbsd.org/netbsd-users/2026/08/06/msg034603.html>
>
>> ....and all of my attempts have failed when I get to the point of
>> accepting the disk layout. It quickly fails with a complaint about not
>> being able to access /dev/dk* (and I'm trying to install on nvme).
>>
>
> I didn't encounter this problem. It makes sense that dk(4) would be
> having those issues because the system uses (or at least did for me,
> using a SATA hard drive) /dev/dk* nodes for GPT partitions. In the
> previous hyperlinked e-mail thread RVP does a great job of briefly
> explaining how this works.
>
> Someone else might be able to intuit what you are missing from this
> information alone but I wonder if you could provide a more detailed
> recollection of the dk(4) complaint.
>
>> Is there a tutorial or FAQ somewhere that I'm not finding, or does
>> anyone have any tips for how I might proceed?
>>
>
> <https://bentsukun.ch/posts/netbsd-wedge-boot/> was a great resource for
> me for understanding NetBSD and UEFI, but going so far as in-kernel boot
> configuration was unnecessary in my case.
>
> Sorry I can't help with your problem. I hope this helps once you make it
> past this initial hurdle. Happy hacking.
>
> <3 :3 -3
>