18c2ecf20Sopenharmony_ciWhat: /sys/devices/.../sun 28c2ecf20Sopenharmony_ciDate: October 2012 38c2ecf20Sopenharmony_ciContact: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> 48c2ecf20Sopenharmony_ciDescription: 58c2ecf20Sopenharmony_ci The file contains a Slot-unique ID which provided by the _SUN 68c2ecf20Sopenharmony_ci method in the ACPI namespace. The value is written in Advanced 78c2ecf20Sopenharmony_ci Configuration and Power Interface Specification as follows: 88c2ecf20Sopenharmony_ci 98c2ecf20Sopenharmony_ci "The _SUN value is required to be unique among the slots of 108c2ecf20Sopenharmony_ci the same type. It is also recommended that this number match 118c2ecf20Sopenharmony_ci the slot number printed on the physical slot whenever possible." 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_ci So reading the sysfs file, we can identify a physical position 148c2ecf20Sopenharmony_ci of the slot in the system. 15