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.
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 http://sites.google.com/site/linuxonpspproject/
uClinux 2.6.22 has recently been ported too and is available at http://jacksonm88.googlepages.com/linuxonpsp.htm