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netboot BeagleBone{Black,Green} w/GENERIC?

Now that BeagleBone uses GENERIC and FDT, what's the proper way to
netboot one?

The old way was:

  => dhcp  # fetch <kernelname>.ub via tftp
  => setenv bootargs root=cpsw0
  => bootm

Also, is my U-boot new enough:

U-Boot 2015.10-00001-g143c9ee (Nov 06 2015 - 15:27:19 -0600), Build: jenkins-github_Bootloader-Builder-274

or will I have to build and install a newer one?  It's been a while since
I updated U-boot on these things.  ISTR that MLO is located at sector 100
and U-boot proper is at sector 300 of an SD/MMC device.

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