Thiemo Seufer schrieb: > Looks very nice, except that the CPU models are out of touch with > reality. :-) > - There is no CPU called "R4Kc" etc. > - What Qemu emulates is currently close to a 4KEc with an R3000-style > FPU attached. (A 4KEc is a 4Kc with MIPS32R2 instructions.) There exists also an older 4KEc version which only supports MIPS32R1. AR7 (a SoC from TI) is based on this older version. I noticed this because some code using DI worked well with QEMU, but my AR7 based DSL router crashed... For AR7, it would be nice to switch between MIPS32R1 / MIPS32R2 instruction sets. I think this could be done similar to the FPU switch, but I don't have a list of the differences, and there are no MIPS32R2 markers in the QEMU code :-( > - MIPS Technologies "4Kc" and "4Kp" have both no FPU support at all, > they are also 32bit only. (IIRC the difference those two is that > the 4Kp has only a fixed mapping MMU, the 4Kc has the real thing.) > - For a Jazz/Magnum-like CPU we should add a "R4000" or probably > a "R4400". This CPU is 64bit and has always a FPU. > - For the Malta I plan to go for a 34Kf, but that lacks a few bits for > now. > > So, to make some sense out of it: > - Qemu "4kc" machine, 32bit, no FPU: 4Kc or 4KEc > - Qemu "4kc" machine, 32bit, with FPU: 24Kf > - Qemu "4kc" machine, 64bit, with FPU: R4000, this should become a > separate machine. > - MIPS Malta, 32bit, no FPU: 4KEc > - MIPS Malta, 32bit, with FPU: 24Kf This looks good. I'd add one more for QEMU with AR7 support: - AR7 machines, 32bit, no FPU, 4KEc with MIPS32R1 only > > Does this sound reasonable? I ask the same question.
Stefan _______________________________________________ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel