[PPC] Some of my ram DIMMs aren't showing up

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http://ubuntuforums.org – Hello everybody with powerpc's, I'm looking to find a way of identifying which ram slots are used. Unfortunately I have 3 gigs worth of DIMMs installed but only 1.5GB of memory show up as recognized by /proc/MemTotal or in System Monitor. I found how to do this with intel/amd architecture but it requires the BIOS in the machines to be read with dmidecode. As this is a powermac G5 dual 2.5ghz dmidecode isn't even in the powerpc repositories. How do you all find which ram slots are being used? (Hardware)