Re: R5000SC issues and fix

[Adrian Chadd <adrian%freebsd.org@localhost>]

On Fri, 5 Dec 2025 at 17:49, Jason Thorpe <thorpej%me.com@localhost> wrote:
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>
>
> > On Dec 5, 2025, at 4:43 PM, Adrian Chadd <adrian%freebsd.org@localhost> wrote:
> > Izumi, do you still have an R5000 Indy and/or other devices? I'm not familiar
> > (yet?) with the R5000 cache stuff, and I can't imagine it never worked!
>
> The R5000 cache stuff worked at one point!  I wrote all that code originally on an Algorithmics P-5064 with an R5K module and it worked great.

It's possible that it's something shady with this machine. I put in a
different set of RAM - and only 32MB instead of 256MB - and it
ran for a while longer but it panicked whilst I wasn't looking.

>
> I also have a Cobalt Qube 2 and while I haven’t fired it up terribly recently, it does have an RM5200 and worked with pre-netbsd-10-current:
>
> https://dmesgd.nycbug.org/dmesgd?do=view&id=5404
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> I guess I ought to boot it up again.  No secondary cache on that machine, tho.

I can try this with the secondary cache disabled entirely and see how
things behave.
I do encourage more MIPS stuff though, I want to work my way forward
through to mips24k/mips34k/mips74k and then the SMP MIPS chips. :-)



-adrian

>
> -- thorpej
>