Re: [Xen-devel] [PATCH] pci-ioapic-0502.patch

["Jonathan S. Shapiro" <shap@xxxxxxxxxxx>]

On Fri, 2005-05-06 at 22:00 +0100, Keir Fraser wrote:

> This is pretty much unsupportable -- if Xen has detected IOAPICs and 
> started to initialise them, it is not really possible to go back to a 
> full legacy PIC mode. If you want to boot 'acpi=off' then you need to 
> add the 'ignorebiostables' option as a Xen boot parameter. This will 
> prevent Xen from finding the IOAPIC and Xen+domain0 can both boot in 
> blissful ignorance.

If acpi=off implies ignorebiostables, then all checks for
ignorebiostables should also check for acpi=off.

shap


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