Systemd keeps waiting on root device start job

[joaco1]

Hi I have two questions first, I cannot boot to linux libre I'm using 
the kernel for fedora systems on an opensuse distro, the systemd log 
says it's waiting on a start job on the root partition. I'm using bcache 
on root and the boot partition is different from the root partition 
because grub2 doesn't see correctly bcache partition. I don't know 
what's the problem since all the other kernels boot fine.

The other questions is that I have a rx460 radeon card,  ¿would I be 
able to use it along the amdgpu kernel module?  ¿Do I need the 4.9 
kernel version?


thanks