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ARM version of MSDOS (Announce)

posted by kerravon, Ligao, Free World North, 25.01.2024, 23:34

Another new version:

https://github.com/o-ksi-d/Pdos-PdAndro/releases/tag/rel.0.0.58

Ad new ucarm.zip from http://pdos.org

> On my Pinebook Pro using ucarm.zip (bios.exe), I was
> required to put in a 0.02 second delay before
> executing any executable code (just placed into
> memory (BSS)). Otherwise it would sometimes work,
> sometimes crash. It's like either Linux or the
> ARM chips is caching something and the cache
> needs to be cleared.
>
> I have an ARM v7 netbook and 0.02 seconds wasn't
> enough. I added a full 1 second and have had no
> problem since.
These delays have now been removed.

While investigating a hard fault on macOS when
trying to do mprotect(), I eventually stumbled
onto

https://chromium.googlesource.com/chromiumos/docs/+/master/constants/syscalls.md

983042 ARM_cacheflush

which worked perfectly (my heart was in my mouth as
I waited to see if that worked - and I nearly
misdiagnosed that it didn't work).

So anyway - this is a fantastic DOS-like machine now
that the major technical hurdle has been overcome.

BFN. Paul.

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