Dual booting Linux and Opencore

Has anyone successfully dual booted a Unibody MacBook Pro with open core legacy patcher and Linux mint.

I’ve tried rEFInd , I’ve tried installing grub after the Linux installation nothing seems to work.

I can install linux and the first reboot gets me into Linux. After that first reboot I can’t get back to Linux. Open core just provides me with the option to boot Mac OS.

Specs 2010 17 inch MacBook Pro 8GB ram. MacBookPro6,1 .