Re: Some fixes for m68k users (incl/ for FPU emulation)

[David Rogers <davidrogers%me.com@localhost>]

Oh you’re right! I’ll go pull the Quadra 610 out and see if it boots

> On Oct 30, 2026, at 1:24 PM, Romain Dolbeau <romain%dolbeau.org@localhost> wrote:
> 
> Le ven. 30 oct. 2026 à 19:11, David Rogers <davidrogers%me.com@localhost> a écrit :
>> I’ll give it a whirl here. I’ve got a Quadra 650 and IIci(in the middle of being recapped) that are up and running
> 
> Very kind of you; beware that likely, only the two small performance
> fixes will be relevant to you (one a simple patch to a shared C file,
> the other is a platform-specific change to an assembly file relevant
> to many ports) - all IIci came with a MC68882 from the factory, and I
> think all Quadra 650 had full MC68040 - Centris 650 were the ones that
> might have had LC040 (and if that was a XC68LC040, the FPU emulation
> will not work due to the well-documented bug in those CPUs).
> 
> FPU emulation is likely to be of limited use - and I haven't checked
> the status of the m68ksf port, but if it's available in 11 then it's a
> better idea than FPU emulation anyway :-) I was stress-testing the
> litex68k system rather than actively looking for bugs. Two full
> RD68041 (my MC68040 clone) don't fit in my FPGA, and replacing the
> userland with m68ksf would have taken time, so the FPU emulation had
> to work really well for the stress-test to succeed :-)
> 
> Cordially,
> 
> --
> Romain Dolbeau