CM4 UEFI boot without Grub

[svanrossem]

I'm trying to UEFI boot CoreOS from a Raspberry Pi Compute Module 4 with a custom compiled kernel. I've disabled Grub because I want to boot direct to the kernel and pass kernel arguments using the cmdline.txt from the EFI partition. The compiled kernel works on a normal Fedora Server installation without Dracut and Grub.

Is it possible to setup a ostree environment without Dracut and Grub, by passing the arguments directly to the kernel?

cmdline.txt

root=/dev/mmcblk0p4 fsck.repair=yes rootwait ostree=/ostree/boot.1/fedora-coreos/ec04f74254468dc92e906b0d41efd12e01b5e64a06889b7dd353632cb42ec5c3/0 ignition.platform.id=metal

[    3.192148] XFS (mmcblk0p4): Ending clean mount
[    3.198766] VFS: Mounted root (xfs filesystem) readonly on device 179:4.
[    3.205610] devtmpfs: error mounting -2
[    3.214583] Freeing unused kernel memory: 5504K
[    3.224652] Run /sbin/init as init process
[    3.228997] Run /etc/init as init process
[    3.233164] Run /bin/init as init process
[    3.237320] Run /bin/sh as init process
[    3.241292] Kernel panic - not syncing: No working init found.  Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance.
[    3.255674] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 6.6.20-tering-serieuze-kernel #12
[    3.263797] Hardware name: Raspberry Pi Compute Module 4 Rev 1.1 (DT)
[    3.270327] Call trace:
[    3.272801]  dump_backtrace+0x9c/0x100
[    3.276609]  show_stack+0x20/0x38
[    3.279967]  dump_stack_lvl+0x60/0xb0
[    3.283679]  dump_stack+0x18/0x28
[    3.287036]  panic+0x344/0x3a0
[    3.290133]  kernel_init+0x1ac/0x1f0
[    3.293758]  ret_from_fork+0x10/0x20
[    3.297383] SMP: stopping secondary CPUs
[    3.301362] Kernel Offset: 0x1609400000 from 0xffffffc080000000
[    3.307364] PHYS_OFFSET: 0x0
[    3.310279] CPU features: 0x0,80000201,3c020000,0000420b
[    3.315666] Memory Limit: none
[    3.318761] ---[ end Kernel panic - not syncing: No working init found.  Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance. ]---