[TUHS] Early Linux and BSD

Jon Steinhart jon at fourwinds.com
Wed Jan 22 03:25:34 AEST 2020


Warner Losh writes:
>
> On Tue, Jan 21, 2020, 10:18 AM Jon Steinhart <jon at fourwinds.com> wrote:
>
> > Lars Brinkhoff writes:
> > > Jon Steinhart wrote:
> > > > The 32032 made sense for the workstation division based on the data
> > sheets.
> > > > But, it turned out to be extremely buggy, and unlike the 68K I don't
> > recall
> > > > the ability to look at and patch the state of the microcode.
> > >
> > > Did you have the ability to look at and patch the state of 68000
> > > microcode?  How?
> >
> > My memory is very very very fuzzy on this.  I seem to recall that microcode
> > state was pushed onto a stack in certain cases, and that it was possible to
> > fix some problems there for certain weird cases relating to memory
> > management.
> > That's all that I remember about it as that's not the part of things that I
> > was working on, just heard grumbles from other folks about it.
> >
>
> This isn't for the two cpu design to allow instructions to be restarted
> after a page fault.
>
> Warner
>
> Jon

No, this was using a 68020 with the PMMU.


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