I think this is a large amount of memory and I always try to reduce such big chunks. As there is no symbol pointing to it, there is not a big clue to it's usage.
When you dump the memory area, you see a few blocks with random data, always preceded by a "deadbeef" valued int. In-betweeen the blocks, all is set to sero.
Can it be that this is the DRAM used by the wlan low-level interface? That these are in fact complete 802.11 packets? It would be nice if this area could be reduced somewhat, 14480 is a lot of DRAM.