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TMS320DM6446: how ROM BOOTLOADER is invoked at power on in dm6446

Part Number: TMS320DM6446

I was trying to understand the bootup sequence for the da vinci dm6446 SoC.

Can someone please help me understand how the boot up happens, as 
we need a non-volatile memory at the reset vector location(DM6446 RAM at addreess 0x00000000). So how does the control reach the ROM 
boot loader(RBL) which is at starting address 0x00004000 . Do we have some kind of remap of memory map 
happenning here.