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1What: /sys/devices/.../sun2Date: October 20123Contact: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>4Description:5 The file contains a Slot-unique ID which provided by the _SUN6 method in the ACPI namespace. The value is written in Advanced7 Configuration and Power Interface Specification as follows:8 9 "The _SUN value is required to be unique among the slots of10 the same type. It is also recommended that this number match11 the slot number printed on the physical slot whenever possible."12 13 So reading the sysfs file, we can identify a physical position14 of the slot in the system.15