BUS_DMA_BUS2
f = flags & (BUS_DMA_BUS1 | BUS_DMA_BUS2 | BUS_DMA_BUS3 | BUS_DMA_BUS4);
#define BUS_DMA_24BIT BUS_DMA_BUS2
#define MCABUS_DMA_IOPORT BUS_DMA_BUS2 /* io-port based DMA */
#define MCABUS_DMA_IOPORT BUS_DMA_BUS2 /* io-port based DMA */
#define _BUS_DMA_DIRECTMAP BUS_DMA_BUS2
#define BUS_DMA_DVMA BUS_DMA_BUS2 /* Don't bother with alignment */
#define _BUS_DMA_DIRECTMAP BUS_DMA_BUS2
#define ISABUS_DMA_DEFERCHAN BUS_DMA_BUS2