1*89ca78a0SLv ZhengWhat: /sys/devices/.../sun 2bb74ac23SYasuaki IshimatsuDate: October 2012 3bb74ac23SYasuaki IshimatsuContact: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> 4bb74ac23SYasuaki IshimatsuDescription: 5bb74ac23SYasuaki Ishimatsu The file contains a Slot-unique ID which provided by the _SUN 6bb74ac23SYasuaki Ishimatsu method in the ACPI namespace. The value is written in Advanced 7bb74ac23SYasuaki Ishimatsu Configuration and Power Interface Specification as follows: 8bb74ac23SYasuaki Ishimatsu 9bb74ac23SYasuaki Ishimatsu "The _SUN value is required to be unique among the slots of 10bb74ac23SYasuaki Ishimatsu the same type. It is also recommended that this number match 11bb74ac23SYasuaki Ishimatsu the slot number printed on the physical slot whenever possible." 12bb74ac23SYasuaki Ishimatsu 13bb74ac23SYasuaki Ishimatsu So reading the sysfs file, we can identify a physical position 14bb74ac23SYasuaki Ishimatsu of the slot in the system. 15