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uenv.tx file

Started by adi, October 06, 2016, 08:18:15 am

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Dear Sir,
               Actually i am working on ZedBoard. I have one uenv.txt file whose content is as follows :-

boot_microZed=mmcinfo;fatload mmc 0 0x3000000 ${kernel_image}; fatload mmc 0 0x2FF0000 ${devicetree_image}; fatload mmc 0 0x2000000 ${ramdisk_image}; bootm 0x3000000 0x2000000 0x2FF0000
uenvcmd=run boot_microZed
uenv_boot=run boot_microZed

I new to LInux development environment. I tried to look on the Internet to get a more insight, somehow i got many things but still one thing that i am not getting is that:--In above uenv.txt content why "run boot_microZed" command is being called two times in two different variables i.e  uenvcmd and uenv_boot repectively and what are these two variables???? Please answer me..