[yocto] Yocto for BeagleboneBlack: how to enable user-LEDs?

[Jerry Lian]

I build yocto image for BBB(Beaglebone Black) with default settings, then:
bitbake core-image-sato
* After I boot the image, all LEDs are off
* And I check folder "/sys/class/", there is no sub-folder "leds"

So how can I enable LEDs when building yocto image?
should I change/add image any distribution/feature, or package groups?

Thanks!
Jerry
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