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I can not fully understand what section of the available external memory is safe to assign for a VDMA on the ZC702 board. I need to dedicate 4MB of memory for the three frames (640*480* 4bytes * 3 frames aligned memory). According to UG585 in Chapter4 table4-1 page 113,

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it is clear that I should not use any memory for the VDMA in the 0x4000_0000 to 0xFDFF_FFFF. But which of the 0x0000_0000 to0x3FFF_FFFF would be the most "safe" to dedicate for my frames? Does it matter?

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Seems to me that 0x0010_0000 to 0x3FFF_FFFF is the range to choose from. This is listed as "accessible to all interconnect masters". 4MB is 0x0040_0000 of addresses - it won't even fit below 0x0010_0000.

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