Re: [Qemu-devel] [PATCH] sparc32 machine specific maximums

[Blue Swirl]

On 12/4/07, Paul Brook <address@hidden> wrote:
> > If you want to make a 16
> > CPU, 64 Gb machine, define a QEMU specific machine.  There are no real
> > 32 bit sparc systems like that.
>
> I believe the Cray CS6400 was a 64-way sparc32 machine with 16Gb ram.
> Admittedly it's a sun4d variant, not sun4m. I've no idea how much difference
> (if any) that makes to OS.

Sun4d is not that different from Sun4m. Interrupt handling is
different. There are several IOUNITs in place of the single IOMMU, but
they use the same page tables. The rest of the devices are the same
old stuff. One (Linux) kernel can be used for all of Sun4c, Sun4m, and
Sun4d.

I think Linux doesn't support more than 4G of memory even on Sun4d.

I have a preliminary patch to implement SS-1000 and SS-2000. If I find
docs for Cray CS6400, I'd be interested to implement that as well.