Some MIPS status goodies.
juli mallett
jmallett at FreeBSD.org
Thu Jun 10 22:14:30 GMT 2004
* Ralf Baechle <ralf at linux-mips.org> [ Date: 2004-06-10 ]
[ w.r.t. Re: Some MIPS status goodies. ]
> On Wed, Jun 09, 2004 at 11:07:12PM -1000, juli mallett wrote:
>
> > R10K and IP28 support are probably a ways away, but I'm interested
> > in supporting these systems and more. Right now it's easiest to start
> > with the, much simpler, R4400 Indigo2 I have here, and get a good base
> > of this stuff, then move into supporting the more modern and complex
> > CPUs and machines - but be assured I am taking them into account!
>
> R10000 in non-coherent systems (Indigo 2 R10000, O2) is a rather hard to
> use processor due to unwanted behaviour of speculative execution that
> leads to memory corruption. The workarounds are fairly complex; efficient
> solutions involve compiler modifications.
Yeah, I read about the compiler mods SGI had to make, with accessing
the stack as a barrier... It sounded like that was only for the
kernel though, yeah?
> That said, the R10000's is resolving all hazards in hardware and does
> almost the entire coherency in software so in a saner system such as
> the Origin it's a breeze.
Right.
juli.
--
juli mallett. jmallett at freebsd.org. adrift in the pacific.
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