1. Please describe the problem:

The Raspberry Pi 400 fails to boot when using the kernel provided dtb - bcm2711-rpi-400. Instead it drops to dracut, can't find the disk. 

Works OK when using the firmware provided dtb. 

2. What is the Version-Release number of the kernel:

5.14 RC's


3. Did it work previously in Fedora? If so, what kernel version did the issue
   *first* appear?  Old kernels are available for download at
   https://koji.fedoraproject.org/koji/packageinfo?packageID=8 :

No. The kernel provided dtb is new in 5.14


4. Can you reproduce this issue? If so, please provide the steps to reproduce
   the issue below:

Boot a recent Rawhide disk image on the Raspberry Pi 400


5. Does this problem occur with the latest Rawhide kernel? To install the
   Rawhide kernel, run ``sudo dnf install fedora-repos-rawhide`` followed by
   ``sudo dnf update --enablerepo=rawhide kernel``:

No. 


6. Are you running any modules that not shipped with directly Fedora's kernel?:

No. 

7. Please attach the kernel logs. You can get the complete kernel log
   for a boot with ``journalctl --no-hostname -k > dmesg.txt``. If the
   issue occurred on a previous boot, use the journalctl ``-b`` flag.