Increase size of dmesg buffer?

[Paul Goyette <paul%whooppee.com@localhost>]

I'm trying to debug some acpi stuff on a fairly large system, and the 
default 32KB of "NVRAM" dmesg space does't seem to be enough - some of 
the important early stuff gets rolled-over before I can capture it.

So, it there some undocumented option that can be used to increase the 
allocated space?  Is there any limitation on how much space can be used?



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