Not that you’re likely to connect a CD/DVD drive to a RISC-V system in 2022+, but the default RISC-V kernel configuration with the upcoming Linux 6.1 kernel adds filesystem support CD-ROM.
In particular, the default RISC-V kernel configuration switched support for ISO9660, Joliet, and ZISOFS file systems. The intent here is not so much to switch CD drives with a RISC-V system, but that some installation media may still be distributed as one of these filesystem images. Some use cases may also involve having images archived in such formats.
Filesystem drivers are already well built on RISC-V and this change is just to enable the default “defconfig” configuration for ISO960/Joliet/ZISOFS.
For RISC-V with Linux 6.1, feature mining also enabled Transparent Huge Page Swap (TH_SWAP) for 64-bit RISC-V systems, default NR_CPUS capacity increased to 512, and improvements were made to the CPU topology subsystem of RISC-V. The latter should now ensure that RISC-V reports correct CPU topology information in more configurations.
See this pull request which was already part of the RISC-V changes introduced for the Linux 6.1 merge window.