[Freemint-list] Broken udelay() for m68000

[David Gálvez]

2017-10-15 20:47 GMT+02:00 Thorsten Otto <admin at tho-otto.de>:
> On Sonntag, 15. Oktober 2017 19:36:49 CEST David Gálvez wrote:
>> it looks like Linux uses it for
>> the simpler 68000 processors too.
>
> But linux m68k requires an MMU, which rules out at least 68000, and i'm not
> sure wether a 68020+MMU kernel ever existed, so the minimum processor that is
> used there is 68030.
>

There was a Linux-m68knommu for embedded systems that was merged with
Linux-m68k, it supported processors with no mmu like some ColdFires
and some basic chips of the 68000 family (683xx ???).

> I think the approach with the Timer C would be safest, unless we need a delay
> somewhere that is less than 26 µs, or the small overhead in calling that
> function has an impact on the timing.
>
>
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