You are correct. I did miss something earlier. The NCP1 needs to be set. Thanks, Kevin. Deng-Cheng 2010/8/4 Kevin D. Kissell <kevink@xxxxxxxxxxxxx>: > You can only set the TC's CU bits if the VPE to which the TC is bound has > access to the coprocessor. See sections 8.2 andf 6.7 of the currently > online spec, and read the MIPS MT Principles of Operation document, if you > can find it. > > On 08/04/10 03:14, Deng-Cheng Zhu wrote: >> >> Thanks for looking into this. >> >> I did do that. But the CU1 bit of TC#1 (in VPE#1) can not be set by >> TC#0 or itself. Looks like VPE#1 is not seeing the FPU at all... >> >> >> Deng-Cheng >> >> >> 2010/8/4 Kevin D. Kissell<kevink@xxxxxxxxxxxxx>: >> >>> >>> Check the MIPS MT spec. If I recall correctly, it's possible to enable >>> access to the FPU by either VPE by setting the right bits while the >>> processor is in the MT configuration mode. >>> >>> Deng-Cheng Zhu wrote: >>> >>>> >>>> Hi, >>>> >>>> >>>> I'm working on a 34Kf CPU. I understand that only one TC can use the >>>> FPU at any given time. >>>> >>>> My question is: If a TC is attached to the 2nd VPE (i.e. VPE1), can I >>>> enable FPU for it? >>>> >>>> I experimented on this, but failed to do it. Am I missing something? >>>> >>>> >>>> Thanks >>>> >>>> Deng-Cheng >>>> >>>> >>>> >>> >>> > >
