The
spdmem driver provides support for generic memory module Serial Presence Detect. During kernel boot it displays module type, and where possible, the size and rated speed of the memory module. Additional information 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.