Re: [PATCH] : ACPI : Use RSDT instead of XSDT by adding boot option of "acpi=rsdt"

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On Fri, Jan 09, 2009 at 01:16:15PM +0100, Thomas Renninger wrote:

> IMO this cannot generally be done, because chances are high that machines
> which do not support Windows likely will break.
> Chances are high that a machine which does not support Windows uses 64 bit
> addresses and leaves the 32 bit ones uninitialized, a spec valid configuration 
> which will then break.

Bear in mind that the values in the 32-bit entries are *io port* 
addresses, not physical memory addresses. There's only 16 bits of io 
ports, so the probability of the 64-bit values being programmed 
correctly and the 32-bit ones containing a valid but not-working set is 
tiny. If you know of any machines that behave this way, I'd be 
impressed - and it'll be far easier to dmi whitelist them than the other 
way around.

-- 
Matthew Garrett | mjg59@xxxxxxxxxxxxx

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