Fedora CoreOS: stuck on efi stub: exiting boot services about rpi3 HOT 4 OPEN

Try pressing F1 to enter the UEFI shell, then type fs0:, fs1:, fs2: etc until you find where your kernel is located. Then type:
.\kernelnamehere root=/dev/rootdevicehere rootwait ro and see what happens.

from rpi3.

For some reason I couldnt find the kernel and rootfs directly in any of the locations listed by map in the UEFI shell (only an EFI folder on fs0 with grub binaries). Therefore I did the following:

1. created a new usb drive from my desktop and manually copied just the rootfs.img and vmlinuz file (from the original fcos iso) to it.
2. Then I plugged it into the rpi, cd'd into it and ran .\vmlinuz root=./rootfs.img rootwait ro (I also tried .\vmlinuz root=.\rootfs.img rootwait ro, just in case)

Results are exactly the same as in my first message.

from rpi3.

The root argument should be what you expect the device to show up as in /dev, not a local file. If you are trying to load an initramfs, use initrd=initrdnamehere.img instead.

Try renaming vmlinuz to kernel8.img.efi and doing the same thing you did before, only invoking .\kernel8.img (not a typo, don't add the .efi) instead. If that works, the answer is simple – the kernel is not properly configured to support UEFI.

from rpi3.

The root argument should be what you expect the device to show up as in /dev, not a local file.

I dont quite understand what you mean by this. I have an iso file. Inside it is a rootfs.img file, a kernel and an initramfs (and some other files like grub). I dont have an unpacked/preinstalled root ready to go on my usb.

Afaik this should really matter though, as even without a rootfs or initramfs, the kernel should be able to at least print something?

Try renaming vmlinuz to kernel8.img.efi and doing the same thing you did before, only invoking .\kernel8.img (not a typo, don't add the .efi) instead.

Same results as before.

If you are trying to load an initramfs, use initrd=initrdnamehere.img instead.

I tried loading an initramfs too, but that did nothing more than adding EFI stub: Loaded initrd from command line option to the output.

If that works, the answer is simple – the kernel is not properly configured to support UEFI.

Could you specify what could be wrong with the kernel? The Fedora CoreOS docs say:

You can boot the live ISO in either legacy BIOS or UEFI mode, regardless of what mode the OS will use once installed.

fedora coreos docs

from rpi3.