24K
From LinuxMIPS
The MIPS 24K and 24KE series of cores are currently MIPS Technologies's high-end synthesizable 32-bit cores.
Linux support
Linux 2.4 and 2.6 support the 24K since 2005-01-19. Linux 2.6 adds support for the 24KE including it's DSP ASE on 2005-05-31.