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Keystone II k2e_evm flash u-boot via uart

Hello I have the K2e_evm devboard.

I want to flash the u-boot 2016 to k2e.

I use your manual http://processors.wiki.ti.com/index.php/MCSDK_UG_Chapter_Exploring#K2_RT_LINUX_03.10.10_13.11.2FK2_LINUX_03.10.10_13.11

to flash the u-boot via uart.

After loading the u-boot nothing happens.

What do I wrong?