SOCP DMA burst transfers over PCIe

I wonder if it is possible to let the DMA controller fetch

data in 32-bit burst word mode over the PCIe bus or do I always have

to use 64-bit boundaries. In not burst mode 32-bit transfers work, but

then every transfer is a PCIe packet which degrades performance ...

In my demo testbench it does not seem to work when I program

the DMA controller in 32-bit mode. The DMA controller busy bit

stays on and does not finish correctly.