21 Jan
2020
21 Jan
'20
11:25 p.m.
Warner Losh writes:
On Tue, Jan 21, 2020, 10:18 AM Jon Steinhart <jon(a)fourwinds.com> wrote:
No, this was using a 68020 with the PMMU.
Lars Brinkhoff writes:
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 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?