Only the Debian #Sid (Unstable) and Debian #Experimental suites are currently available for the #riscv64 architecture.

The Debian Project announced today that the #RISC-V (riscv64) hardware architecture is now officially supported by the #Debian #GNU/Linux operating system.

https://9to5linux.com/debian-gnu-linux-is-now-officially-supported-on-the-risc-v-architecture

Debian GNU/Linux Is Now Officially Supported on the RISC-V Architecture - 9to5Linux

The Debian GNU/Linux operating system is now officially supported on the RISC-V 64 (riscv64) hardware architecture.

^{Marius Nestor (9to5Linux)}