diff --git a/minix/drivers/audio/cmi8738/Makefile b/minix/drivers/audio/cmi8738/Makefile
deleted file mode 100644
index fe875766e..000000000
--- a/minix/drivers/audio/cmi8738/Makefile
+++ /dev/null
@@ -1,8 +0,0 @@
-# Makefile for the CMI8738 driver
-PROG=	cmi8738
-SRCS=	cmi8738.c
-
-DPADD+= ${LIBAUDIODRIVER} ${LIBCHARDRIVER} ${LIBSYS}
-LDADD+= -laudiodriver -lchardriver -lsys
-
-.include <minix.service.mk>
diff --git a/minix/drivers/audio/cmi8738/README b/minix/drivers/audio/cmi8738/README
deleted file mode 100644
index 92bcbe4a7..000000000
--- a/minix/drivers/audio/cmi8738/README
+++ /dev/null
@@ -1,12 +0,0 @@
-The cmi8738 driver is for C-Media 8738/8768 sound card.
-
-This driver is referred to Minix(3.4.0) es1371 driver, 
-Linux(4.2.1) snd_cmipci driver and CMI8738 Audio Specification(Rev 2.2).
-
-Revision 1.0 2016/12/16
-Authored by Jia-Ju Bai <baijiaju1990@163.com>
-
-Something can be improved: 
-1. MIDI and MPU-401 ports are not supported.
-2. Only supported 8 and 16 sample bits, and common sample rates (like 44100).
-3. Multiple music files may not be played well at the same time.
diff --git a/minix/drivers/audio/cmi8738/cmi8738.c b/minix/drivers/audio/cmi8738/cmi8738.c
deleted file mode 100644
index 890673e78..000000000
--- a/minix/drivers/audio/cmi8738/cmi8738.c
+++ /dev/null
@@ -1,697 +0,0 @@
-#include "cmi8738.h"
-
-/* global value */
-DEV_STRUCT dev;
-aud_sub_dev_conf_t aud_conf[3];
-sub_dev_t sub_dev[3];
-special_file_t special_file[3];
-drv_t drv;
-
-#ifdef MIXER_SB16
-#define SB16_MASTER_LEFT	0x30
-#define SB16_MASTER_RIGHT	0x31
-#define SB16_DAC_LEFT		0x32
-#define SB16_DAC_RIGHT		0x33
-#define SB16_FM_LEFT		0x34
-#define SB16_FM_RIGHT		0x35
-#define SB16_CD_LEFT		0x36
-#define SB16_CD_RIGHT		0x37
-#define SB16_LINE_LEFT		0x38
-#define SB16_LINE_RIGHT		0x39
-#define SB16_MIC_LEVEL		0x3a
-#define SB16_PC_LEVEL		0x3b
-#define SB16_TREBLE_LEFT	0x44
-#define SB16_TREBLE_RIGHT	0x45
-#define SB16_BASS_LEFT		0x46
-#define SB16_BASS_RIGHT		0x47
-#endif
-
-/* internal function */
-static int dev_probe(void);
-static int set_sample_rate(u32_t rate, int num);
-static int set_stereo(u32_t stereo, int num);
-static int set_bits(u32_t bits, int sub_dev);
-static int set_frag_size(u32_t frag_size, int num);
-static int set_sign(u32_t val, int num);
-static int get_frag_size(u32_t *val, int *len, int num);
-static int free_buf(u32_t *val, int *len, int num);
-static void dev_set_default_volume(u32_t base);
-
-/* developer interface */
-static int dev_reset(u32_t base);
-static void dev_configure(u32_t base);
-static void dev_init_mixer(u32_t base);
-static void dev_set_sample_rate(u32_t base, u16_t sample_rate);
-static void dev_set_format(u32_t base, u32_t bits, u32_t sign, 
-							u32_t stereo, u32_t sample_count);
-static void dev_start_channel(u32_t base, int sub_dev);
-static void dev_stop_channel(u32_t base, int sub_dev);
-static void dev_set_dac_dma(u32_t base, u32_t dma, u32_t len);
-static void dev_set_adc_dma(u32_t base, u32_t dma, u32_t len);
-static void dev_pause_dma(u32_t base, int sub_dev);
-static void dev_resume_dma(u32_t base, int sub_dev);
-static void dev_intr_other(u32_t base, u32_t status);
-
-/* ======= Developer-defined function ======= */
-/* Write the data to mixer register (AC97 or SB16) (### WRITE_MIXER_REG ###) */
-static void dev_mixer_write(u32_t base, u32_t reg, u32_t val) {
-	sdr_out8(base, REG_SB_ADDR, reg);
-	sdr_out8(base, REG_SB_DATA, val);
-}
-
-/* Read the data from mixer register (AC97 or SB16) (### READ_MIXER_REG ###) */
-static u32_t dev_mixer_read(u32_t base, u32_t reg) {
-	sdr_out8(base, REG_SB_ADDR, reg);
-	return sdr_in8(base, REG_SB_DATA);
-}
-
-/* ====== Developer interface ======*/
-
-/* Reset the device (### RESET_HARDWARE_CAN_FAIL ###)
- * -- Return OK means success, Others means failure */
-static int dev_reset(u32_t base) {
-	u32_t cmd = CMD_C0_PLAY;
-	u32_t data;
-	data = sdr_in32(base, REG_MISC_CTRL);
-	sdr_out32(base, REG_MISC_CTRL, CMD_RESET | data);
-	data = sdr_in32(base, REG_MISC_CTRL);
-	sdr_out32(base, REG_MISC_CTRL, ~CMD_RESET & data);
-	sdr_out32(base, REG_FUNC_CTRL, CMD_RESET_C0 | cmd);
-	sdr_out32(base, REG_FUNC_CTRL, ~CMD_RESET_C0 & cmd);
-	sdr_out32(base, REG_FUNC_CTRL, CMD_RESET_C1 | cmd);
-	sdr_out32(base, REG_FUNC_CTRL, ~CMD_RESET_C1 & cmd);
-	return OK;	
-}
-
-/* Configure hardware registers (### CONF_HARDWARE ###) */
-static void dev_configure(u32_t base) {
-	u32_t data;
-	sdr_out32(base, REG_INTR_CTRL, 0);
-	data = 0x00040000;
-	sdr_out32(base, REG_FUNC_CTRL, 0x00000001 | data);
-	sdr_out32(base, REG_FUNC_CTRL, 0x00000001 & (~data));
-	data = 0x00080000;
-	sdr_out32(base, REG_FUNC_CTRL, 0x00000002 | data);
-	sdr_out32(base, REG_FUNC_CTRL, 0x00000002 & (~data));
-	sdr_out32(base, REG_FUNC_CTRL, 0);
-	sdr_out32(base, REG_FUNC_CTRL1, 0);
-	sdr_out32(base, REG_FORMAT, 0);
-	data = sdr_in32(base, REG_MISC_CTRL);
-	sdr_out32(base, REG_MISC_CTRL, data | CMD_DDAC_ENA | CMD_SPK3D);
-	data = sdr_in32(base, REG_MISC_CTRL);
-	sdr_out32(base, REG_MISC_CTRL, data & (~CMD_EXDAC));
-	data = sdr_in32(base, REG_FUNC_CTRL1);
-	sdr_out32(base, REG_FUNC_CTRL1, data | CMD_MASTER_ENA);
-}
-
-/* Initialize the mixer (### INIT_MIXER ###) */
-static void dev_init_mixer(u32_t base) {
-	dev_mixer_write(base, 0, 0);
-}
-
-/* Set DAC and ADC sample rate (### SET_SAMPLE_RATE ###) */
-static void dev_set_sample_rate(u32_t base, u16_t sample_rate) {
-	int i;
-	u32_t data, rate;
-
-	for (i = 0; i < 8; i++) {
-		if (sample_rate == g_sample_rate[i]) {
-			rate = i;
-			break;
-		}
-	}
-	data = (rate << 13) & 0x0000e000;
-	data |= (rate << 10) & 0x00001c00;
-	sdr_out32(base, REG_FUNC_CTRL1, data);
-}
-
-/* Set DAC and ADC format (### SET_FORMAT ###)*/
-static void dev_set_format(u32_t base, u32_t bits, u32_t sign, 
-							u32_t stereo, u32_t sample_count) {
-	u32_t format = 0;
-	u32_t data;
-	if (stereo == 1)
-		format |= FMT_STEREO;
-	if (bits == 16)
-		format |= FMT_BIT16;
-	data = sdr_in32(base, REG_FORMAT);
-	data &= ~0x00000003;
-	data |= format << 0;
-	data &= ~0x0000000c;
-	data |= format << 2;
-	sdr_out32(base, REG_FORMAT, data);
-	sdr_out16(base, REG_DAC_SAMPLE_COUNT, sample_count - 1);
-	sdr_out16(base, REG_ADC_SAMPLE_COUNT, sample_count - 1);
-}
-
-/* Start the channel (### START_CHANNEL ###) */
-static void dev_start_channel(u32_t base, int sub_dev) {
-	u32_t data;
-	if (sub_dev == DAC) {
-		sdr_out32(base, REG_FUNC_CTRL, CMD_C0_PLAY & 0xfffffff0);
-		data = sdr_in32(base, REG_FUNC_CTRL);
-		sdr_out32(base, REG_FUNC_CTRL, data | CMD_ENA_C0);
-	}
-	else if (sub_dev == ADC) {
-		sdr_out32(base, REG_FUNC_CTRL, CMD_C0_PLAY);
-		data = sdr_in32(base, REG_FUNC_CTRL);
-		sdr_out32(base, REG_FUNC_CTRL, data | CMD_ENA_C1);
-	}
-}
-
-/* Stop the channel (### STOP_CHANNEL ###) */
-static void dev_stop_channel(u32_t base, int sub_dev) {
-	u32_t data;
-	if (sub_dev == DAC) {
-		data = sdr_in32(base, REG_FUNC_CTRL);
-		sdr_out32(base, REG_FUNC_CTRL, data & (~CMD_ENA_C0));
-	}
-	else if (sub_dev == ADC) {
-		data = sdr_in32(base, REG_FUNC_CTRL);
-		sdr_out32(base, REG_FUNC_CTRL, data & (~CMD_ENA_C1));
-	}
-}
-
-/* Set DAC DMA address and length (### SET_DAC_DMA ###) */
-static void dev_set_dac_dma(u32_t base, u32_t dma, u32_t len) {
-	sdr_out32(dev.base, REG_DAC_DMA_ADDR, dma);
-	sdr_out16(dev.base, REG_DAC_DMA_LEN, len - 1);
-}
-
-/* Set ADC DMA address and length (### SET_ADC_DMA ###) */
-static void dev_set_adc_dma(u32_t base, u32_t dma, u32_t len) {
-	sdr_out32(dev.base, REG_ADC_DMA_ADDR, dma);
-	sdr_out16(dev.base, REG_ADC_DMA_LEN, len - 1);
-}
-
-/* Pause the DMA */
-static void dev_pause_dma(u32_t base, int sub_dev) {
-	if (sub_dev == DAC)
-		sdr_out32(base, REG_FUNC_CTRL, CMD_PAUSE_C0 | CMD_C0_PLAY);
-	else if (sub_dev == ADC)
-		sdr_out32(base, REG_FUNC_CTRL, CMD_PAUSE_C1 | CMD_C0_PLAY);
-}
-
-/* Resume the DMA */
-static void dev_resume_dma(u32_t base, int sub_dev) {
-	if (sub_dev == DAC)
-		sdr_out32(base, REG_FUNC_CTRL, ~CMD_PAUSE_C0 & CMD_C0_PLAY);
-	else if (sub_dev == ADC)
-		sdr_out32(base, REG_FUNC_CTRL, ~CMD_PAUSE_C1 & CMD_C0_PLAY);
-}
-
-/* Other interrupt handle */
-static void dev_intr_other(u32_t base, u32_t status) {
-}
-
-#ifdef MIXER_SB16
-static int get_set_volume(u32_t base, struct volume_level *level, int flag) {
-	int max_level, shift, cmd_left, cmd_right;
-	
-	max_level = 0x1f;
-	shift = 3;
-	/* Check device */
-	switch (level->device) {
-		case Master:
-			cmd_left = SB16_MASTER_LEFT;
-			cmd_right = SB16_MASTER_RIGHT;
-			break;
-		case Dac:
-			cmd_left = SB16_DAC_LEFT;
-			cmd_right = SB16_DAC_RIGHT;
-			break;
-		case Fm:
-			cmd_left = SB16_FM_LEFT;
-			cmd_right = SB16_FM_RIGHT;
-			break;
-		case Cd:
-			cmd_left = SB16_CD_LEFT;
-			cmd_right = SB16_CD_RIGHT;
-			break;
-		case Line:
-			cmd_left = SB16_LINE_LEFT;
-			cmd_left = SB16_LINE_RIGHT;
-			break;
-		case Mic:
-			cmd_left = cmd_right = SB16_MIC_LEVEL;
-			break;
-		case Speaker:
-			cmd_left = cmd_right = SB16_PC_LEVEL;
-			shift = 6;
-			max_level = 0x03;
-			break;
-		case Treble:
-			cmd_left = SB16_TREBLE_LEFT;
-			cmd_right = SB16_TREBLE_RIGHT;
-			shift = 4;
-			max_level = 0x0f;
-			break;
-		case Bass:
-			cmd_left = SB16_BASS_LEFT;
-			cmd_right = SB16_BASS_RIGHT;
-			shift = 4;
-			max_level = 0x0f;
-			break;
-		default:
-			return EINVAL;
-	}
-	/* Set volume */
-	if (flag) {
-		if (level->right < 0)
-			level->right = 0;
-		else if (level->right > max_level)
-			level->right = max_level;
-		if (level->left < 0)
-			level->left = 0;
-		else if (level->left > max_level)
-			level->left = max_level;
-		/* ### WRITE_MIXER_REG ### */
-		dev_mixer_write(base, cmd_left, level->left << shift);
-		/* ### WRITE_MIXER_REG ### */
-		dev_mixer_write(base, cmd_right, level->right << shift);
-	}
-	/* Get volume */
-	else {
-		/* ### READ_MIXER_REG ### */
-		level->left = dev_mixer_read(base, cmd_left);
-		/* ### READ_MIXER_REG ### */
-		level->right = dev_mixer_read(base, cmd_right);
-		level->left >>= shift;
-		level->right >>= shift;
-	}
-	return OK;
-}
-#endif
-
-/* Probe the device */
-static int dev_probe(void) {
-	u32_t device, size, base;
-	int devind, ioflag;
-	u16_t vid, did;
-	u8_t *reg;
-
-	pci_init();
-	device = pci_first_dev(&devind, &vid, &did);
-	while (device > 0) {
-		if (vid == VENDOR_ID && did == DEVICE_ID)
-			break;
-		device = pci_next_dev(&devind, &vid, &did);
-	}
-	if (vid != VENDOR_ID || did != DEVICE_ID)
-		return EIO;
-	pci_reserve(devind);
-
-#ifdef DMA_REG_MODE
-	if (pci_get_bar(devind, PCI_BAR, &base, &size, &ioflag)) {
-		printf("SDR: Fail to get PCI BAR\n");
-		return EIO;
-	}
-	if (ioflag) {
-		printf("SDR: PCI BAR is not for memory\n");
-		return EIO;
-	}
-	if ((reg = vm_map_phys(SELF, (void *)base, size)) == MAP_FAILED) {
-		printf("SDR: Fail to map hardware registers from PCI\n");
-		return EIO;
-	}
-	dev.base = (u32_t)reg;
-#else
-	dev.base = pci_attr_r32(devind, PCI_BAR) & 0xffffffe0;
-#endif
-
-	dev.name = pci_dev_name(vid, did);
-	dev.irq = pci_attr_r8(devind, PCI_ILR);
-	dev.revision = pci_attr_r8(devind, PCI_REV);
-	dev.did = did;
-	dev.vid = vid;
-	dev.devind = devind;
-	pci_attr_w16(devind, PCI_CR, 0x105);
-
-#ifdef MY_DEBUG
-	printf("SDR: Hardware name is %s\n", dev.name);
-	printf("SDR: PCI base address is 0x%08x\n", dev.base);
-	printf("SDR: IRQ number is 0x%02x\n", dev.irq);
-#endif
-	return OK;
-}
-
-/* Set sample rate in configuration */
-static int set_sample_rate(u32_t rate, int num) {
-	aud_conf[num].sample_rate = rate;
-	return OK;
-}
-
-/* Set stereo in configuration */
-static int set_stereo(u32_t stereo, int num) {
-	aud_conf[num].stereo = stereo;
-	return OK;
-}
-
-/* Set sample bits in configuration */
-static int set_bits(u32_t bits, int num) {
-	aud_conf[num].nr_of_bits = bits;
-	return OK;
-}
-
-/* Set fragment size in configuration */
-static int set_frag_size(u32_t frag_size, int num) {
-	if (frag_size > (sub_dev[num].DmaSize / sub_dev[num].NrOfDmaFragments) ||
-		frag_size < sub_dev[num].MinFragmentSize) {
-		return EINVAL;
-	}
-	aud_conf[num].fragment_size = frag_size;
-	return OK;
-}
-
-/* Set frame sign in configuration */
-static int set_sign(u32_t val, int num) {
-	aud_conf[num].sign = val;
-	return OK;
-}
-
-/* Get maximum fragment size */
-static int get_max_frag_size(u32_t *val, int *len, int num) {
-	*len = sizeof(*val);
-	*val = (sub_dev[num].DmaSize / sub_dev[num].NrOfDmaFragments);
-	return OK;
-}
-
-/* Return 1 if there are free buffers */
-static int free_buf(u32_t *val, int *len, int num) {
-	*len = sizeof(*val);
-	if (sub_dev[num].BufLength == sub_dev[num].NrOfExtraBuffers)
-		*val = 0;
-	else
-		*val = 1;
-	return OK;
-}
-
-/* Get the current sample counter */
-static int get_samples_in_buf(u32_t *result, int *len, int chan) {
-	u32_t res;
-	if (chan == DAC) {
-		/* ### READ_DAC_CURRENT_ADDR ### */
-		res = sdr_in32(dev.base, REG_DAC_CUR_ADDR);
-		*result = (u32_t)(sub_dev[chan].BufLength * 8192) + res;
-	}
-	else if (chan == ADC) {
-		/* ### READ_ADC_CURRENT_ADDR ### */
-		res = sdr_in32(dev.base, REG_ADC_CUR_ADDR);
-		*result = (u32_t)(sub_dev[chan].BufLength * 8192) + res;
-	}
-	return OK;
-}
-
-/* Set default mixer volume */
-static void dev_set_default_volume(u32_t base) {
-#ifdef MIXER_SB16
-	dev_mixer_write(dev.base, SB16_MASTER_LEFT, 0x12 << 3);
-	dev_mixer_write(dev.base, SB16_MASTER_RIGHT, 0x12 << 3);
-	dev_mixer_write(dev.base, SB16_DAC_LEFT, 0x12 << 3);
-	dev_mixer_write(dev.base, SB16_DAC_RIGHT, 0x12 << 3);
-	dev_mixer_write(dev.base, SB16_FM_LEFT, 0x12 << 3);
-	dev_mixer_write(dev.base, SB16_FM_RIGHT, 0x12 << 3);
-	dev_mixer_write(dev.base, SB16_CD_LEFT, 0x12 << 3);
-	dev_mixer_write(dev.base, SB16_CD_RIGHT, 0x12 << 3);
-	dev_mixer_write(dev.base, SB16_LINE_LEFT, 0x12 << 3);
-	dev_mixer_write(dev.base, SB16_LINE_RIGHT, 0x12 << 3);
-	dev_mixer_write(dev.base, SB16_MIC_LEVEL, 0x12 << 3);
-	dev_mixer_write(dev.base, SB16_PC_LEVEL, 0x01 << 6);
-	dev_mixer_write(dev.base, SB16_TREBLE_LEFT, 0x08 << 4);
-	dev_mixer_write(dev.base, SB16_TREBLE_RIGHT, 0x08 << 4);
-	dev_mixer_write(dev.base, SB16_BASS_LEFT, 0x08 << 4);
-	dev_mixer_write(dev.base, SB16_BASS_RIGHT, 0x08 << 4);
-#endif
-}
-
-/* ======= [Audio interface] Initialize data structure ======= */
-int drv_init(void) {
-	drv.DriverName = "SDR";
-	drv.NrOfSubDevices = 3;
-	drv.NrOfSpecialFiles = 3;
-
-	sub_dev[DAC].readable = 0;
-	sub_dev[DAC].writable = 1;
-	sub_dev[DAC].DmaSize = 64 * 1024;
-	sub_dev[DAC].NrOfDmaFragments = 2;
-	sub_dev[DAC].MinFragmentSize = 1024;
-	sub_dev[DAC].NrOfExtraBuffers = 4;
-
-	sub_dev[ADC].readable = 1;
-	sub_dev[ADC].writable = 0;
-	sub_dev[ADC].DmaSize = 64 * 1024;
-	sub_dev[ADC].NrOfDmaFragments = 2;
-	sub_dev[ADC].MinFragmentSize = 1024;
-	sub_dev[ADC].NrOfExtraBuffers = 4;
-
-	sub_dev[MIX].writable = 0;
-	sub_dev[MIX].readable = 0;
-
-	special_file[0].minor_dev_nr = 0;
-	special_file[0].write_chan = DAC;
-	special_file[0].read_chan = NO_CHANNEL;
-	special_file[0].io_ctl = DAC;
-
-	special_file[1].minor_dev_nr = 1;
-	special_file[1].write_chan = NO_CHANNEL;
-	special_file[1].read_chan = ADC;
-	special_file[1].io_ctl = ADC;
-
-	special_file[2].minor_dev_nr = 2;
-	special_file[2].write_chan = NO_CHANNEL;
-	special_file[2].read_chan = NO_CHANNEL;
-	special_file[2].io_ctl = MIX;
-
-	return OK;
-}
-
-/* ======= [Audio interface] Initialize hardware ======= */
-int drv_init_hw(void) {
-	int i;
-
-	/* Match the device */
-	if (dev_probe()) {
-		printf("SDR: No sound card found\n");
-		return EIO;
-	}
-
-	/* Reset the device */
-	/* ### RESET_HARDWARE_CAN_FAIL ### */
-	if (dev_reset(dev.base)) {
-		printf("SDR: Fail to reset the device\n");
-		return EIO;
-	}
-
-	/* Configure the hardware */
-	/* ### CONF_HARDWARE ### */
-	dev_configure(dev.base);
-
-	/* Initialize the mixer */
-	/* ### INIT_MIXER ### */
-	dev_init_mixer(dev.base);
-
-	/* Set default mixer volume */
-	dev_set_default_volume(dev.base);
-
-	/* Initialize subdevice data */
-	for (i = 0; i < drv.NrOfSubDevices; i++) {
-		if (i == MIX)
-			continue;
-		aud_conf[i].busy = 0;
-		aud_conf[i].stereo = 1;
-		aud_conf[i].sample_rate = 44100;
-		aud_conf[i].nr_of_bits = 16;
-		aud_conf[i].sign = 1;
-		aud_conf[i].fragment_size = 
-			sub_dev[i].DmaSize / sub_dev[i].NrOfDmaFragments;
-	}
-	return OK;
-}
-
-/* ======= [Audio interface] Driver reset =======*/
-int drv_reset(void) {
-	/* ### RESET_HARDWARE_CAN_FAIL ### */
-	return dev_reset(dev.base);
-}
-
-/* ======= [Audio interface] Driver start ======= */
-int drv_start(int sub_dev, int DmaMode) {
-	int sample_count;
-
-	/* Set DAC and ADC sample rate */
-	/* ### SET_SAMPLE_RATE ### */
-	dev_set_sample_rate(dev.base, aud_conf[sub_dev].sample_rate);
-
-	sample_count = aud_conf[sub_dev].fragment_size;
-#ifdef DMA_FRAME_LENGTH
-	sample_count = sample_count / (aud_conf[sub_dev].nr_of_bits * (aud_conf[sub_dev].stereo + 1) / 8);
-#endif
-	/* Set DAC and ADC format */
-	/* ### SET_FORMAT ### */
-	dev_set_format(dev.base, aud_conf[sub_dev].nr_of_bits,
-			aud_conf[sub_dev].sign, aud_conf[sub_dev].stereo, sample_count); 
-
-	/* Start the channel */
-	/* ### START_CHANNEL ### */
-	dev_start_channel(dev.base, sub_dev);
-	aud_conf[sub_dev].busy = 1;
-
-	return OK;
-}
-
-/* ======= [Audio interface] Driver start ======= */
-int drv_stop(int sub_dev) {
-	u32_t data;
-
-	/* ### DISABLE_INTR ### */
-	data = sdr_in32(dev.base, REG_INTR_CTRL);
-	sdr_out32(dev.base, REG_INTR_CTRL, data & (~CMD_INTR_ENA));
-
-	/* ### STOP_CHANNEL ### */
-	dev_stop_channel(dev.base, sub_dev);
-
-	aud_conf[sub_dev].busy = 0;
-	return OK;
-}
-
-/* ======= [Audio interface] Enable interrupt ======= */
-int drv_reenable_int(int chan) {
-	u32_t data;
-
-	/* ### ENABLE_INTR ### */
-	data = sdr_in32(dev.base, REG_INTR_CTRL);
-	sdr_out32(dev.base, REG_INTR_CTRL, data & (~CMD_INTR_ENA));
-	sdr_out32(dev.base, REG_INTR_CTRL, data | CMD_INTR_ENA);
-	return OK;
-}
-
-/* ======= [Audio interface] I/O control ======= */
-int drv_io_ctl(unsigned long request, void *val, int *len, int sub_dev) {
-	int status;
-	switch (request) {
-		case DSPIORATE:
-			status = set_sample_rate(*((u32_t *)val), sub_dev);
-			break;
-		case DSPIOSTEREO:
-			status = set_stereo(*((u32_t *)val), sub_dev);
-			break;
-		case DSPIOBITS:
-			status = set_bits(*((u32_t *)val), sub_dev);
-			break;
-		case DSPIOSIZE:
-			status = set_frag_size(*((u32_t *)val), sub_dev);
-			break;
-		case DSPIOSIGN:
-			status = set_sign(*((u32_t *)val), sub_dev);
-			break;
-		case DSPIOMAX:
-			status = get_max_frag_size(val, len, sub_dev);
-			break;
-		case DSPIORESET:
-			status = drv_reset();
-			break;
-		case DSPIOFREEBUF:
-			status = free_buf(val, len, sub_dev);
-			break;
-		case DSPIOSAMPLESINBUF:
-			status = get_samples_in_buf(val, len, sub_dev);
-			break;
-		case DSPIOPAUSE:
-			status = drv_pause(sub_dev);
-			break;
-		case DSPIORESUME:
-			status = drv_resume(sub_dev);
-			break;
-		case MIXIOGETVOLUME:
-			/* ### GET_SET_VOLUME ### */
-			status = get_set_volume(dev.base, val, GET_VOL);
-			break;
-		case MIXIOSETVOLUME:
-			/* ### GET_SET_VOLUME ### */
-			status = get_set_volume(dev.base, val, SET_VOL);
-			break;
-		default:
-			status = EINVAL;
-			break;
-	}
-	return status;
-}
-
-/* ======= [Audio interface] Get request number ======= */
-int drv_get_irq(char *irq) {
-	*irq = dev.irq;
-	return OK;
-}
-
-/* ======= [Audio interface] Get fragment size ======= */
-int drv_get_frag_size(u32_t *frag_size, int sub_dev) {
-	*frag_size = aud_conf[sub_dev].fragment_size;
-	return OK;
-}
-
-/* ======= [Audio interface] Set DMA channel ======= */
-int drv_set_dma(u32_t dma, u32_t length, int chan) {
-#ifdef DMA_FRAME_LENGTH
-	length = length / (aud_conf[chan].nr_of_bits * (aud_conf[chan].stereo + 1) / 8);
-#endif
-	if (chan == DAC) {
-		/* ### SET_DAC_DMA ### */
-		dev_set_dac_dma(dev.base, dma, length);
-	}
-	else if (chan == ADC) {
-		/* ### SET_ADC_DMA ### */
-		dev_set_adc_dma(dev.base, dma, length);
-	}
-	return OK;
-}
-
-/* ======= [Audio interface] Get interrupt summary status ======= */
-int drv_int_sum(void) {
-	u32_t status;
-	/* ### READ_INTR_STS ### */
-	status = sdr_in32(dev.base, REG_INTR_STS);
-	/* ### CHECK_INTR_DAC ### */ /* ### CHECK_INTR_ADC ### */
-	return (status & (INTR_STS_DAC | INTR_STS_ADC));
-}
-
-/* ======= [Audio interface] Handle interrupt status ======= */
-int drv_int(int sub_dev) {
-	u32_t status, mask;
-
-	/* ### READ_INTR_STS ### */
-	status = sdr_in32(dev.base, REG_INTR_STS);
-
-	/* ### CHECK_INTR_DAC ### */
-	if (sub_dev == DAC)
-		mask = INTR_STS_DAC;
-	/* ### CHECK_INTR_ADC ### */
-	else if (sub_dev == ADC)
-		mask = INTR_STS_ADC;
-	else
-		return EINVAL;
-	/* ### CLEAR_INTR_STS ### */
-	sdr_out32(dev.base, REG_INTR_STS, CMD_INTR_CLR);
-
-	/* ### OTHER_INTR_HANDLE ###*/
-	dev_intr_other(dev.base, status);
-
-	drv_reenable_int(sub_dev);
-#ifdef MY_DEBUG
-	printf("SDR: Interrupt status is 0x%08x\n", status);
-#endif
-	return status & mask;
-}
-
-/* ======= [Audio interface] Pause DMA ======= */
-int drv_pause(int sub_dev) {
-	/* ### PAUSE_DMA ### */
-	dev_pause_dma(dev.base, sub_dev);
-	return OK;
-}
-
-/* ======= [Audio interface] Resume DMA ======= */
-int drv_resume(int sub_dev) {
-	/* ### RESUME_DMA ### */
-	dev_resume_dma(dev.base, sub_dev);
-	return OK;
-}
diff --git a/minix/drivers/audio/cmi8738/cmi8738.conf b/minix/drivers/audio/cmi8738/cmi8738.conf
deleted file mode 100644
index d96491ba0..000000000
--- a/minix/drivers/audio/cmi8738/cmi8738.conf
+++ /dev/null
@@ -1,10 +0,0 @@
-service cmi8738
-{
-        system
-                UMAP            # 14
-                IRQCTL          # 19
-                DEVIO           # 21
-        ;
-        pci device 13f6:0111;
-};
-
diff --git a/minix/drivers/audio/cmi8738/cmi8738.h b/minix/drivers/audio/cmi8738/cmi8738.h
deleted file mode 100644
index d282af56c..000000000
--- a/minix/drivers/audio/cmi8738/cmi8738.h
+++ /dev/null
@@ -1,100 +0,0 @@
-#ifndef _SDR_H
-#define _SDR_H
-
-#include <minix/audio_fw.h>
-#include <sys/types.h>
-#include <sys/ioc_sound.h>
-#include <minix/sound.h>
-#include <machine/pci.h>
-#include "io.h"
-
-/* ======= General Parameter ======= */
-/* Global configure */
-#define DMA_FRAME_LENGTH
-#define MIXER_SB16
-
-/* Subdevice type */
-#define DAC		0
-#define ADC		1
-#define MIX		2
-
-/* PCI number */
-#define VENDOR_ID	0x13f6
-#define DEVICE_ID	0x0111
-
-/* Volume option */
-#define GET_VOL		0
-#define SET_VOL		1
-
-/* Key internal register */
-#define REG_DAC_DMA_ADDR	0x80
-#define REG_DAC_DMA_LEN		0x84
-#define REG_DAC_CUR_ADDR	0x80
-#define REG_ADC_DMA_ADDR	0x88
-#define REG_ADC_DMA_LEN		0x8c
-#define REG_ADC_CUR_ADDR	0x88
-#define REG_INTR_CTRL		0x0c
-#define REG_INTR_STS		0x10
-
-/* Key command */
-#define CMD_INTR_ENA		0x00030000
-#define CMD_INTR_CLR		0x00000000
-
-/* Interrupt status */
-#define INTR_STS_DAC		0x80000001
-#define INTR_STS_ADC		0x80000002
-
-/* ======= Self-defined Parameter ======= */
-#define REG_FUNC_CTRL			0x00
-#define REG_FUNC_CTRL1			0x04
-#define REG_FORMAT				0x08
-#define REG_MISC_CTRL			0x18
-#define REG_SB_DATA				0x22
-#define REG_SB_ADDR				0x23
-#define REG_DAC_SAMPLE_COUNT	0x86
-#define REG_ADC_SAMPLE_COUNT	0x8e
-
-#define FMT_BIT16		0x02
-#define FMT_STEREO		0x01
-
-#define CMD_MASTER_ENA	0x00000010
-#define CMD_EXDAC		0x00400000
-#define CMD_DDAC_ENA	0x00800000
-#define CMD_SPK3D		0x04000000
-#define CMD_M037		0x08000000
-#define CMD_RESET		0x40000000
-#define CMD_RESET_C0	0x00040000
-#define CMD_RESET_C1	0x00080000
-#define CMD_ENA_C0		0x00010000
-#define CMD_ENA_C1		0x00020000
-#define CMD_PAUSE_C0	0x00000004
-#define CMD_PAUSE_C1	0x00000008
-#define CMD_C0_PLAY		0x00000002
-
-static u32_t g_sample_rate[] = {
-	5512, 11025, 22050, 44100, 8000, 16000, 32000, 48000
-};
-
-/* Driver Data Structure */
-typedef struct aud_sub_dev_conf_t {
-	u32_t stereo;
-	u16_t sample_rate;
-	u32_t nr_of_bits;
-	u32_t sign;
-	u32_t busy;
-	u32_t fragment_size;
-	u8_t format;
-} aud_sub_dev_conf_t;
-
-typedef struct DEV_STRUCT {
-	char *name;
-	u16_t vid;
-	u16_t did;
-	u32_t devind;
-	u32_t base;
-	u32_t sb_base;
-	char irq;
-	char revision;
-} DEV_STRUCT;
-
-#endif
diff --git a/minix/drivers/audio/cmi8738/io.h b/minix/drivers/audio/cmi8738/io.h
deleted file mode 100644
index c94c6d66b..000000000
--- a/minix/drivers/audio/cmi8738/io.h
+++ /dev/null
@@ -1,84 +0,0 @@
-#ifndef _IO_H
-#define _IO_H
-
-#include <sys/types.h>
-#include <minix/syslib.h>
-#include "cmi8738.h"
-
-/* I/O function */
-static u8_t my_inb(u32_t port) {
-	u32_t value;
-	int r;
-#ifdef DMA_REG_MODE
-	value = *(u8_t *)(port);
-#else
-	if ((r = sys_inb(port, &value)) != OK)
-		printf("SDR: sys_inb failed: %d\n", r);
-#endif
-	return (u8_t)value;
-}
-#define sdr_in8(port, offset) (my_inb((port) + (offset)))
-
-static u16_t my_inw(u32_t port) {
-	u32_t value;
-	int r;
-#ifdef DMA_REG_MODE
-	value = *(u16_t *)(port);
-#else
-	if ((r = sys_inw(port, &value)) != OK)
-		printf("SDR: sys_inw failed: %d\n", r);
-#endif
-	return (u16_t)value;
-}
-#define sdr_in16(port, offset) (my_inw((port) + (offset)))
-
-static u32_t my_inl(u32_t port) {
-	u32_t value;
-	int r;
-#ifdef DMA_REG_MODE
-	value = *(u32_t *)(port);
-#else
-	if ((r = sys_inl(port, &value)) != OK)
-		printf("SDR: sys_inl failed: %d\n", r);
-#endif
-	return value;
-}
-#define sdr_in32(port, offset) (my_inl((port) + (offset)))
-
-static void my_outb(u32_t port, u32_t value) {
-	int r;
-#ifdef DMA_REG_MODE
-	*(u8_t *)(port) = value;
-#else
-	if ((r = sys_outb(port, (u8_t)value)) != OK)
-		printf("SDR: sys_outb failed: %d\n", r);
-#endif
-}
-#define sdr_out8(port, offset, value) \
-				(my_outb(((port) + (offset)), (value)))
-
-static void my_outw(u32_t port, u32_t value) {
-	int r;
-#ifdef DMA_REG_MODE
-	*(u16_t *)(port) = value;
-#else
-	if ((r = sys_outw(port, (u16_t)value)) != OK)
-		printf("SDR: sys_outw failed: %d\n", r);
-#endif
-}
-#define sdr_out16(port, offset, value) \
-				(my_outw(((port) + (offset)), (value)))
-
-static void my_outl(u32_t port, u32_t value) {
-	int r;
-#ifdef DMA_REG_MODE
-	*(u32_t *)(port) = value;
-#else
-	if ((r = sys_outl(port, value)) != OK)
-		printf("SDR: sys_outl failed: %d\n", r);
-#endif
-}
-#define sdr_out32(port, offset, value) \
-				(my_outl(((port) + (offset)), (value)))
-
-#endif