sysfs-devices-sun

 1What:		/sys/devices/.../sun
 2Date:		October 2012
 3Contact:	Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
 4Description:
 5		The file contains a Slot-unique ID which provided by the _SUN
 6		method in the ACPI namespace. The value is written in Advanced
 7		Configuration and Power Interface Specification as follows:
 8
 9		"The _SUN value is required to be unique among the slots of
10		the same type. It is also recommended that this number match
11		the slot number printed on the physical slot whenever possible."
12
13		So reading the sysfs file, we can identify a physical position
14		of the slot in the system.