RX_DMA_BURST
#define RX_DMA_BURST 6 /* Maximum PCI burst, '6' is 1024 */
#define RX_DMA_BURST 4 /* Maximum PCI burst, '4' is 256 bytes */
#define RX_DMA_BURST 0
#define RX_DMA_BURST 4 /* Maximum PCI burst, '4' is 256 bytes */