On Tue, May 15, 2007 at 04:45:53AM -0400, Corey Osgood wrote: > [EMAIL PROTECTED] wrote: > > Hello, > > Can someone please explain to me the difference between Logical and > > Physical Banks on SDRAM? I am looking for a quick and dirty way to > > determine if the SDRAM module is single sided or double sided through > > SPD. Would I use the Logical (SPD Byte 17) or Physical (SPD Byte 5) > > Bank for that? > > > > Thanks - Joe > > > > Well, in the best case, neither. Read the Intel SPD standard > (http://www.intel.com/design/chipsets/memory/spdsd12a.pdf), I've checked > several PC66, 100, and 133 dimms, and all of them so far support it. > Check out bytes 126 and 127. If that doesn't work out though, you're > looking for byte 5.
Just to prevent unnecessary duplicated work: please don't write SPD-related functions for 440BX. I'm about to finish a patch which moves all generic SPD-related functions into src/sdram/spd.c where all chipsets can use them. The SPD-only stuff should be chipset-independent, only the chipset-specific stuff should be handled in the respective raminit.c. Uwe. -- http://www.hermann-uwe.de | http://www.holsham-traders.de http://www.crazy-hacks.org | http://www.unmaintained-free-software.org
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