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Memory Configuration in DM8168 DVR_RDK

I use DM8168 DVR_RDK4.0,   there is some confusion about the memory configuration for me. 

There is a memory configuration for HDVPSS, and in MCFW, there is another  memory configuration for the system. If I used 2G configuration, HDVPSS  memory configuration seems not compatible with the MCFW  memory configuration, for example,  in HDVPSS  memory configuration, Linux memory is 256M, but in  MCFW  memory configuration, Linux memory is 512M.

Is the  HDVPSS  memory configuration only used for loading the binary and then reallocated?

Why are they not conflicted?  What's the function of  HDVPSS  memory configuration?