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Some basic specs of the PSP:

  • two MIPS32R2 cores with no TLB
  • 128bit Bus
  • 1 - 333MHz @ 1.2V
  • Main Memory: 32MB, 4MB eDRAM
  • Bus Bandwidth: 2.6GB/sec
  • I-Cache, D-Cache
  • FPU, VFPU (Vector Unit) @ 2.6GFlops
  • 3D-CG Extended Instructions

The description should be taken with a grain of salt. For instance, even the CPU core is not clear - maybe it is MIPS 4KE, but maybe 24K... The Coprocessor seems to be totally custom.

Lack of MMU makes this machine pretty much worthless except as a toy - which is what it was devised for, after all.

Linux support

Since the PSP's Allegrex CPU has no mmu, only uClinux variety kernels can be run on it. A mipsnommu branch of uClinux 2.4.19 has been ported to the PSP and is available at

uClinux 2.6.22 has recently been ported too and is available at

External Links