I think the RISC-V is way faster, otherwise you probably won't have any advantage, except knowing that the whole ISA is opensource in contrast to AVR chips.
You're better off using coreboot, libreboot is just a set of patches removing non-libre boards and microcode support.
All you need is a Raspberry Pi and a 15 dollar POMONA 5250 SOIC clip.
I think the RISC-V is way faster, otherwise you probably won't have any advantage, except knowing that the whole ISA is opensource in contrast to AVR chips.
You're better off using coreboot, libreboot is just a set of patches removing non-libre boards and microcode support.
All you need is a Raspberry Pi and a 15 dollar POMONA 5250 SOIC clip.