1*4882a593SmuzhiyunWhat: /sys/devices/.../sun 2*4882a593SmuzhiyunDate: October 2012 3*4882a593SmuzhiyunContact: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> 4*4882a593SmuzhiyunDescription: 5*4882a593Smuzhiyun The file contains a Slot-unique ID which provided by the _SUN 6*4882a593Smuzhiyun method in the ACPI namespace. The value is written in Advanced 7*4882a593Smuzhiyun Configuration and Power Interface Specification as follows: 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun "The _SUN value is required to be unique among the slots of 10*4882a593Smuzhiyun the same type. It is also recommended that this number match 11*4882a593Smuzhiyun the slot number printed on the physical slot whenever possible." 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun So reading the sysfs file, we can identify a physical position 14*4882a593Smuzhiyun of the slot in the system. 15