Yes, you are right.
U-boot first operations are the following: initialize DRAM and relocate u-boot to DRAM.
We did not measure this time. You can estimate this time look at u-boot DRAM initialization code.
See the following documents:
http://www.denx.de/en/pub/Documents/Presentations/EWC2012_Roeder_Zundel_Fastboot.pdf
Look at recommendations for u-boot in the following document:
http://free-electrons.com/pub/conferences/2014/elc/opdenacker-boot-time/opdenacker-boot-time.pdf
See also the following:
http://xillybus.com/tutorials/uboot-hacking-howto-3
http://processors.wiki.ti.com/index.php/Optimize_Linux_Boot_Time
Have a great day,
Pavel Chubakov
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