SNDRV_GF1_GB_DRAM_DMA_CONTROL
snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL, 0x00);
snd_gf1_look8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL);
snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL, dma_cmd);
if (snd_gf1_i_look8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL) & 0x40) {