Setting fedora for rust embeeded

i am using fedora 31 during install
sudo dnf install
arm-none-eabi-gdb
openocd
qemu-system-arm

showing

Last metadata expiration check: 0:38:49 ago on Sat 15 Feb 2020 08:39:32 PM IST.
No match for argument: arm-none-eabi-gdb
Package openocd-0.10.0-14.fc31.x86_64 is already installed.
Package qemu-system-arm-2:4.1.1-1.fc31.x86_64 is already installed.
Error: Unable to find a match: arm-none-eabi-gdb

how to install arm-none-eabi-gdb or gdb-multiarch in fedora....