[LinuxBIOS] DIMM Page Size

Segher Boessenkool segher at kernel.crashing.org
Wed Jul 11 13:48:32 CEST 2007

> Anyone know what the mathmatical calculation is to determine a Dimms
> "Page Size"?? I found this but it does not seem to work:
> Page size = (2^col)*bus_width
> where,
> col = number of column address lines (SPD byte 4: Number of Column  
> Addresses)
> bus_width = number of data(DQ) lines (???SPD byte 13: SDRAM Device  
> Width???)

"device width" is the number of data lines per DRAM chip on
your DIMM.  This isn't the same as the number of data lines
on the DIMM itself; that is 64 usually (not counting the ECC
bits).  This info is in the SPD as well.


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