/var/run/dmesg.boot

/var/run/dmesg.boot file contains the FreeBSD boot messages, and this is very helpful for checking hardware related info: 

# cat /var/run/dmesg.boot | grep -i CPU
CPU: Intel(R) Core(TM) i5-4310U CPU @ 2.00GHz (2594.03-MHz K8-class CPU)
cpu0: <ACPI CPU> on acpi0

Because the capacity of system message buffer is limited, FreeBSD employs /var/run/dmesg.boot in case the content of buffer is flushed.

References:
Devices and Device Nodes;
Back To Basics: Unix Differences in Performing Tasks.

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