@paradroyd @loke DRI did release a version of CP/M for the 68000. I'm not sure if available source code is complete enough to rebuild it though. At any rate, it's really limited compared to its successor, GEMDOS.
If you're looking for a native 68K OS, and desire a CP/M or DOS-like user experience, I'd recommend using GEMDOS instead, which nowadays you can find a clone for the EmuTOS project.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko