On Wednesday, 21 September 2016 12:59:39 BST Langer, Thomas wrote:
> Hello Paul,
>
> > diff --git a/arch/mips/cpu/start.S b/arch/mips/cpu/start.S
> > index fc6dd66..dd37ac3 100644
> > --- a/arch/mips/cpu/start.S
> > +++ b/arch/mips/cpu/start.S
> > @@ -112,6 +112,31 @@ ENTRY(_start)
> >
> > .align 4
> >
> > reset:
> > +#if __mips_isa_rev >= 6
> > + .set push
> > + .set reorder
> > + mfc0 t0, CP0_CONFIG, 1
> > + bgez t0, 1f
> > + mfc0 t0, CP0_CONFIG, 2
> > + bgez t0, 1f
> > + mfc0 t0, CP0_CONFIG, 3
> > + bgez t0, 1f
> > + mfc0 t0, CP0_CONFIG, 4
> > + bgez t0, 1f
> > + mfc0 t0, CP0_CONFIG, 5
> > + and t0, t0, MIPS_CONF5_VP
> > + beqz t0, 1f
> > +
> > + mfc0 t0, CP0_GLOBALNUMBER
> > + b 2f
> > + .set pop
> > +#endif
> > +
> > +1: mfc0 t0, CP0_EBASE
> > + and t0, t0, EBASE_CPUNUM
> > +
> > + /* Hang if this isn't the first CPU in the system */
> > +2: bnez t0, .
>
> This loop should include a "wait" instruction.
> Otherwise the CPU will burn power for doing nothing.
>
> Thomas
Hi Thomas,
True, it would spin until (typically) it gets reset by Linux or whatever OS is
booted. I'll add a wait.
Thanks,
Paul
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