console=tty1 may not be available at all. tty0 should correspond to
/dev/console, which is definitely there. It will match the last
console parameter specified in the kernel cmdline, if available.

Needed for bootloding with separate patition /boot.

QEMU for riscv virt machine passes its own DTB. Overriding DTB breaks
Linux loading.

It is possible to set a timeout for automatic bootloading via a
variable.

When loading u-boot + extlinux.conf, needs specific arguments that
are not needed when using grub-efi

Temp fix