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