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If you're using a prebiost install from like ten point two or later, the boot loader both support gelly natively. There's very detailed article on the allans company site outlining how free b sds boot loader actually works that is well worth a read. I don't know of a great use case for gelly at this point, other than legacy stuff. But if you've done a modern install of fribs d, it will just prompt you for the password during boot and it will find all the right disks and do it all.