did a series of boots with 4.18.rc6, rcu=0-3, rcu=0-7, from power off, from reset (behaviour is always different from power on versus when starting from a reset.) applied the radion and amdgpu options above, no success. The behaviour varies (sometimes hang, sometimes crash, sometimes loop infinitely, once in a while get to initramfs prompt.)
did a series of boots with 4.18.rc6, rcu=0-3, rcu=0-7, from power off, from reset (behaviour is always different from power on versus when starting from a reset.) applied the radion and amdgpu options above, no success. The behaviour varies (sometimes hang, sometimes crash, sometimes loop infinitely, once in a while get to initramfs prompt.)