tl;dr: A developer has ported Linux (kernel 7.1.0-rc6) to the Sega Mega Drive, using a Mega EverDrive cartridge to provide 4MB of RAM via its SSF2 mapper, USB serial console access, and SD card storage. The system boots via U-Boot, runs on the 68000 CPU, and even offers a video console output on the Mega Drive itself, though performance is currently "insanely slow" and slower than a comparable 12MHz 68000 system. A QEMU fork is included for testing without real hardware.