spdmem(4) - NetBSD Manual Pages

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SPDMEM(4)               NetBSD Kernel Interfaces Manual              SPDMEM(4)


NAME

     spdmem -- Generic Memory Module Serial Presence Detect


SYNOPSIS

     spdmem* at iic? addr 0x50
     spdmem* at iic? addr 0x51
     spdmem* at iic? addr 0x52
     spdmem* at iic? addr 0x53
     spdmem* at iic? addr 0x54
     spdmem* at iic? addr 0x55
     spdmem* at iic? addr 0x56
     spdmem* at iic? addr 0x57


DESCRIPTION

     The spdmem driver provides support for generic memory module Serial Pres-
     ence Detect.  During kernel boot it displays module type, and where pos-
     sible, the size and rated speed of the memory module.  Additional infor-
     mation such as bank configuration and width is printed if the kernel is
     booted in verbose mode.

     The Serial Presence Detect data for each memory module is also made
     accessible to user mode via sysctl(8).  An entry for each spdmem device
     is created under the hw top-level MIB.

     Some SPD ROMs also have a temperature sensor.  It's supported by
     sdtemp(4).


SEE ALSO

     iic(4), intro(4), sdtemp(4)


HISTORY

     The spdmem driver first appeared in NetBSD 5.0.


AUTHORS

     The spdmem driver was written by Nicolas Joly <njoly@pasteur.fr> with
     additional work by Paul Goyette <paul@whooppee.com>.

NetBSD 9.2                       July 27, 2016                      NetBSD 9.2