ARM: zynq: Add uEnv.txt support
preboot macro load the uEnv.txt from mmc 0 when bootmode is mmc. uenvcmd is executed after load of uEnv.txt if it is defined in the uEnv.txt env text file. The default importbootenv macro reads the uEnv.txt from mmc. Additional to this, usb_loadbootenv is added to support loading uEnv.txt from usb dev 0. Signed-off-by: NJason Wu <jason.wu.misc@gmail.com> Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
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