EFI boot error: please append a correct device "root=" boot option

I try to start the system without a boot loader for faster boot.
I compiled the Linux-kernel-5.8.5 and copied the .../arch/x86/boot/bzImage file to /boot/efi/EFI/ubuntu.efi. Reboot in to BIOS, selected ubuntu.efi and added to the secure boot.
The system starts but I get the following error:

Please append a correct device "root=" boot option; here are the available partitions:
(driver?)
103:00001 123456 nvme0n1p1 ...UUID....
103:00002 123456 nvme0n1p2 ...UUID....
103:00003 123456 nvme0n1p3 ...UUID....

kernel panic - not syncing: VFS: unable to mount root fs on unknown-block(0,0)

The pci, fs and nvme driver are build in the kernel (*).