Re: [MiNT] Firebee Coldfire MiNT Kernel and NFS

[OL <o.l@lutece.net>]

Hello Vincent,

Far long time I have compiled for coldfire MyAES that use TAS 
instruction and use it on coldfire evaluation board, I never seen any 
problem, so I suppose the problem is probably link to the hardware 
design. But for the use we have of it, BSET.B work fine, thanks for your 
past help on MyAES.

Regards

Olivier

> On 04/09/2014 17:34, Vincent Rivière wrote:
> > Another idea.
>
> ... just browse the NFS sources and see what looks bad for the FireBee.
> And I found... an inline assembler block with the TAS instruction, 
> just in case some day FreeMiNT would multitask in supervisor mode !!
>
> The TAS instruction is very special at the hardware level, and for an 
> unknown reason it does not work as expected on the FireBee. It should 
> NEVER be used on the FireBee (FYI, the same applies to Amiga).
>
> Furthermore, TAS is only useful on multiprocessor systems. I hardly 
> see a multicore 680x0 system in a near future...
>
> By chance, "BSET.B #7" is a totally standard user mode instruction, 
> and does exactly the same job as TAS on monoprocessor systems. So I 
> replaced that instruction.
>
> Then... The NFS client works perfectly in the FireBee now.
> And it is fast :-D
>
> I will provide a patch.