Download the latest disk image
Go to this link for the nightly builds and select the most recent (top) build. Look for the -sda.raw.xz file and download it. It will usually be quite large, around 200-300 MB.
Uncompress it:
$ unxz Fedora-Developer-Rawhide-xxxx.n.0-sda.raw.xz
Root password
riscv
Boot under qemu
You will need a very recent version of qemu. If in doubt, compile from upstream qemu sources.
Get bbl from here or compile it from source.
qemu-system-riscv64 \
-nographic \
-machine virt \
-smp 4 \
-m 2G \
-kernel bbl \
-object rng-random,filename=/dev/urandom,id=rng0 \
-device virtio-rng-device,rng=rng0 \
-append "console=ttyS0 ro root=/dev/vda1" \
-device virtio-blk-device,drive=hd0 \
-drive file=Fedora-Developer-Rawhide-xxxx.n.0-sda.raw,format=raw,id=hd0 \
-device virtio-net-device,netdev=usernet \
-netdev user,id=usernet,hostfwd=tcp::10000-:22
Install on the HiFive Unleashed SD card
These are instructions for the HiFive Unleashed board.
The disk image (above) is partitioned, but usually we need an unpartitioned ("naked") filesystem. There are several ways to get this, but the easiest is:
$ guestfish -a Fedora-Developer-Rawhide-xxxx.n.0-sda.raw \
run : download /dev/sda1 Fedora-Developer-Rawhide-xxxx.n.0-sda1.raw
This creates a naked ext4 filesystem called *-sda1.raw. The naked ext4 filesystem can be copied over the second partition of the SD card.
You can also build a custom bbl+kernel+initramfs to boot directly into the SD card using these sources.
Install on the HiFive Unleashed using NBD server
Look at https://github.com/rwmjones/fedora-riscv-kernel in the sifive_u540 branch. This is quite complex to set up so it's best to ask on the #fedora-riscv IRC channel.