atmel_nand_dma_transfer
!atmel_nand_dma_transfer(nc, buf, nand->activecs->io.dma, len,
!atmel_nand_dma_transfer(nc, (void *)buf, nand->activecs->io.dma,
ret = atmel_nand_dma_transfer(&nc->base, (void *)buf,
ret = atmel_nand_dma_transfer(&nc->base, buf, nc->sram.dma,