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BOOT.mcs image size

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BOOT.mcs image size

Based on the tutorials from AVNET site, QSPI boot needs a MCS image (BOOT.mcs).  It turns out that my generated BOOT.mcs image (FSBL, bitstream and u-boot) is 11.3M in size, whereas its BOOT.bin counterpart is only 3.9M in size. The MCS format itself takes up an extra 7M bytes.  Why is BOOT.mcs doubled in size?   
For upgrade and backup purposes, we would like to store at least two images on QSPI flash.  BOOT.bin is less than 4M in size.  Would BOOT.bin work on the QSPI flash?