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xen-devel
Re: [Xen-devel] Via Cyrix 3 II / CentaurHauls Nehemiah support
> Hi,
>
> Fixed! Attached is a patch for the current unstable tree to enable
> support for the Via C3-II. It allows the CPU in Xen itself, adds it to
> the Xenolinux CPU config (although this is equivalent to a regular 686
> for now), and also lets Xenolinux initialise it. I just copied the
> relevant sections of code from the regular Linux source, and it seems to
> work fine.
Cheers. We should probably make the default such that it prints a
big warning message if it doesn't know about the CPU, but then
has a go booting anyway. We could have an exclusion list of
things we know don't work e.g. 586 or older. Want to update your
patch? ;-)
> Also attached are dmesg outputs from patched Xen and DOM0 running on the
> Nehemiah, plus /proc/cpuinfo from Red Hat 9 and DOM0. Apart from the
> CPU MHz changing slightly (as they often do between reboots), I notice
> DOM0 also includes the xstore flag and that the bogomips are almost 10
> times the MHz, rather than almost double. Other than that it all looks
> pretty standard, which is comforting.
Interesting about the bogomips. I haven't looked too closely at
what other CPUs do. I suspect its a generic problem in the xeno
setup code, but I doubt it has any real consequence.
> Incidentally I also had to connect a PS/2 keyboard since the USB
> keyboard wasn't recognised. Somehow both then allowed input, although
> the Num Lock changes only affected the PS/2 keyboard which prevented the
> right side of the USB keyboard from being used for letters (it's a mini
> laptop style thing and defaults to Num Lock on). Are there any thoughts
> on adding USB support yet?
I suspect the BIOS is making the USB keyboard look like PS/2.
Native USB support for Xen will be rather easier in the new IO
model, but its not currently high on our priority list.
Ian
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