The package binutils-riscv64-unknown-elf 2.32.2020.04+dfsg-2 has been added to kali-rolling. It has been imported from Debian: https://tracker.debian.org/pkg/binutils-riscv64-unknown-elf -- More information about binutils-riscv64-unknown-elf: http://pkg.kali.org/pkg/binutils-riscv64-unknown-elf