For refind: This is resolved. As per: https://bbs.archlinux.org/viewtopic.php?pid=1468931#p1468931 Summary: There are 2 methods: (a) Add the initrd=.. to the refind_linux.conf file. (b) If using stanza in refind.conf then add initrd=<microcode.img> Both methods work it seems. I can confirm (b) works fine. g