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led(4/sparc) SPARC LED driver
led(4/sparc64) SPARC64 LED driver

LED(4) Device Drivers Manual (sparc) LED(4)

ledSPARC LED driver

led0 at mainbus0 (sun4 and sun4e)
led0 at obio0 (sun4m: 4/600)

The led driver provides an indicator of load average based on blinking of the LEDs on some systems. The pattern takes one second per whole number of load average to repeat. The LED must be explicitly enabled with the sysctl(3) variable machdep.led_blink.

sysctl(3), intro(4), sysctl(8)

OpenBSD support for the led first appeared in OpenBSD 2.3.

July 10, 2010 OpenBSD-6.0