Re: Toshiba TX3927 board boot problem.

[Ralf Baechle <ralf@oss.sgi.com>]

On Tue, Oct 30, 2001 at 09:36:01AM +0100, Carsten Langgaard wrote:

> > So,  we should not set CU1 generically for FPU-less CPUs especially since a
> > known problem exists
> > for the tx3927?  Ie, qualify all setting of CU1 as follows:
> >
> > if (mips_cpu.options & MIPS_CPU_FPU)
> >                    set_cp0_status(ST0_CU1);
> 
> And while we are at it, could we handle the CP0 hazard of 4 nops, between
> setting the CU1 bit in the status register and executing
> the first floating point instruction, on CPU which got a FPU.

Which CPUs actually need four nops?

Just working on a patch; I found a bunch more place where we were playing
with the CU1 bit.

  Ralf