[LinuxBIOS] SPD Logical and Physical Banks

[Corey Osgood]

joe at smittys.pointclark.net 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.

-Corey