Overriding ACPI tables

["H. Peter Anvin" <hpa@zytor.com>]

Thomas Renninger wrote:
> Peter: You wrote the syslinux stuff, right? What kind of luck is that :)
> There currently is a discussion about being able to override ACPI tables
> via initrd. The discussion is a bit stuck because the data is needed
> earlier than initrd is unpacked and the hacks to make it work are not
> accepted by Linus. I thought about adding another binary image to i386
> boot protocol, similar to initrd= which contains data for very early
> kernel boot initialization, but this would be a heavy hammer (but IMO
> still better than only do it for kexec, another suggestion...) , I
> better open a separate thread or pre-ask privately whether this makes
> sense at all. It would be great if you could advise and possibly help to
> convince so that we finally may find a solution accepted mainline.

We're putting in a mechanism for pushing larger tables already; we need 
it for other things (in particular, the zones for E820 and EDD in the 
boot_info_table are simply not big enough.)  That gives a generic 
mechanism for sending arbitrary-sized binary images to the kernel.  That 
would be the mechanism to use.

I believe it's in upstream as this merge window; it's definitely in 
x86.git already.

	-hpa
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