u-boot config for Petalinux 2016.4

[tristan.gibson]

Whats the best way to customize the u-boot for a petalinux 2016.4 build for the microZed?

In particular, I'm looking to tftp the bitstream file as part of the netboot.  In an older version of uboot, the commands were like:

tftpboot ${loadbit_addr} ${bitstream_image};fpga load 0 ${loadbit_addr}

[trigger]

You can edit environment variable in order to add your custom command before booting the kernel