Should I continue to install , keep two efi partition for dual boot?

[freeink]

Installed Debian buster,10.2 for entire disk.
Then resized the last home partition sda4, Left 112G unallocated partition for FreeBSD to install
Debian have a 512M efi, FreeBSD guided partitioning tool will create another 200M efi ,
keep both the Linux and FreeBSD efi partitions?

 

[freeink]

menuentry "FreeBSD-10.3 /boot/loader"{
insmod ufs2
set root=(hd0,gpt6)

kfreebsd /boot/loader

};

can not boot to FreeBSD , end it up with many small black rectangle dots

 

[freeink]

How to slice unallocated partition into "ada0p5a and ada0p5b" instead of "ada0p5 and ada0p6"

 

[Phishfry]

Two different disk schemes here. You cannot mix and match. Either MBR or GPT scheme.
ada0p5 is a GPT scheme.
ada0s5a would be an MBR scheme.

You could either use the debian EFI partition for the boot files (and use grub2 to choose what to boot) or create a FreeBSD EFI partition on ada0p5 and then use ada0p6 for the installation and use the BIOS to choose what to OS boot. The BIOS will detect the two different /BOOT/BOOT.EFI files.
This will need to be installed by hand as the FreeBSD installer wants the whole disk.
You can drop to a shell during the partition phase of the install and do this I believe. This is not a very easy task.

 

[freeink]

"update-grub /dev/sda" not working "chainloader +1" not working
must manually edit /boot/grub/grub.cfg
The following configuration did the trick:

menuentry "freeBSD" {

insmod ufs2
set root=(hd0,gpt6)
chainloader /boot/loader.efi

}

### END /etc/grub.d/40_custom ###

if miss ".efi" will cause error cannot load image.

 

[freeink]

Thanks Phishfry, spent another night in motel to fix this.

kfreebsd /boot/loader.efi not working will cause "error:invalid a.out header."

If do not keep FreeBSD partition tool 200M efi , I guess can omit the ".efi"

insmod ufs2
set root=(hd0,gpt6)
chainloader /boot/loader