The raspberry pi 4 apparently isn't supported. I'm not exactly clear on why, and how this links to the above issue, and if any of the things they suggest are problems in their bug tracker are also not solved in Fedora, or are simply raspberry pi people being unwilling to fix in their setup.
The fedora/etc problem has to do with the lack of uboot/edk2 and upstream kernel support. Once support lands in the appropriate repos you can expect fedora will enable it.
The raspberry pi 4 apparently isn't supported. I'm not exactly clear on why, and how this links to the above issue, and if any of the things they suggest are problems in their bug tracker are also not solved in Fedora, or are simply raspberry pi people being unwilling to fix in their setup.