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This device attribute uses the same 2-byte dashed formatting as lspci serial number capability output: more /sys/devices/pci0000:c0/0000:c0:01.1/0000:c1:00.0/0000:c2:1f.0/0000:cc:00.0/device_serial_number 00-80-ee-00-00-00-41-80 Accompanying lspci output: sudo lspci -vvv -s cc:00.0 cc:00.0 Serial Attached SCSI controller: Broadcom / LSI PCIe Switch management endpoint (rev b0) Subsystem: Broadcom / LSI Device 0144 ... Capabilities: [100 v1] Device Serial Number 00-80-ee-00-00-00-41-80 ... If a device doesn't support the serial number capability, userspace will receive an empty read: more /sys/devices/pci0000:00/0000:00:07.1/device_serial_number echo $? 0 Matthew Wood (1): PCI/sysfs: Expose PCIe device serial number drivers/pci/pci-sysfs.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) -- 2.50.0