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Re: [Xen-devel] Latest xen-unstable on IBM x440

On 4 May 2005, at 19:00, Nakajima, Jun wrote:

As far as I remember, acpi=ht and acpi=off means different things. What
IBM x440 requires is "acpi=ht", which uses ACPI tables to get logical
CPUs (for HT), and uses MPS to get PCI interrupt routing info.

For interrupt routing, which is what breaks, I think it is equivalent to acpi=off. We've fixed quite a few issues with the patch already, but haven't yet dug into apic.c and io_apic.c -- I think those two are the key to successfully booting non-acpi. I don't think it will be that tricky either -- mostly a case of carefully adding back code that was removed because it isn't used when using ACPI for irq routing.

 -- Keir

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