boot manager

its been a while since fooling with multiple drives but i have 8 drive 
bay some have freebsd installed on them and an nvme with freebsd 
installed on it (on motherboard) but for the life of me i cannot get the 
pc to boot from the nvme drive unless i unplug the sata drives that have 
bootable freebsd on them .

i have tried different motherboards and even when selecting F12 to boot 
off the nvme they still boot off the sata drive.

i tried turning on and off CSM, boot priorities etc, even had a sis9300 
card in there that i went into its bios and disabled booting fron sata 
but still system boots from sata drive instead of nvme.


out of curiosity i installed truenas and notice it installed grub2 boot 
manager i assume on the nvme, i remember when freebsd had a menu vcome 
up with F1 xxxx f2 xxxxx etc with its boot manager.


thing is i dont see that option during install to put a boot manager on 
the nvme, researching i found some comments on putting .efi files in 
some directory or something but im not understanding how that works.


does anyone have any insight on this?


i need some training i think on this.


i really dont want linux on my nas.


Thank You .


George