Install Win10 and shrink the volume with their tools. Then get a live GNU/Linux OS like gparted live and partition the remainder of your drive. Note: Win10 will create the EFI partition for you. For the OpenBSD partition do not format it. Follow instructions on installing OpenBSD carefully to install on the correct partition using GPT.T Following, install GNU Linux and use grub2 and os-prober to create a boot menu. You may need to manually add a section for OpenBSD. In a nutshell that is all there is to it.
On Fri, Sep 18, 2020 at 6:31 AM Thomas Frohwein <tfrohw...@fastmail.com> wrote: > > On Fri, Sep 18, 2020 at 03:15:21AM -0300, Gustavo Rios wrote: > > Hi folks! > > > > I would like to install on my notebook 3 operating systems: OpenBSD, > > Linux and Windows 10. > > > > Do you know any tutorial on how the create the partitions using GPT > > before i install any of the 3 OSes ? I would like to boot via UEFI; is > > there any special partition for the UEFI booting ? May the 3 OSes use > > the UEFI boot partition ? > > > > This will be my first experience with GPT/UEFI so i need a little > > help. May you point me in the right direction? > > The most pertinent section of the FAQ would be [1]. > > For what it's worth, I dual-boot Windows 10 and OpenBSD on my laptop, > using MBR and BCD. A PBR for Linux could probably be added without > problems. > > Note that this depends on third-party software out of our control, and > therefore (quoting the FAQ): "you are completely on your own." > > [1] https://www.openbsd.org/faq/faq4.html#Multibooting >
