Kernel starts booting with firmware 20190618 after commit
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bfcea5204287b0a09dac71fa56a5d066d94d9bb1

Unfortunately, when I apply that patch to 4.19.59, compilation fails, so I
don't know if it's enough