diff --git a/board/gateworks/gw_ventana/common.c b/board/gateworks/gw_ventana/common.c
index 017494f..ec04060 100644
--- a/board/gateworks/gw_ventana/common.c
+++ b/board/gateworks/gw_ventana/common.c
@@ -51,6 +51,17 @@
 	IOMUX_PADS(PAD_SD3_CMD__SD3_CMD    | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
 	IOMUX_PADS(PAD_SD3_RST__SD3_RESET  | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
 };
+/* 4-bit microSD on SD2 */
+static iomux_v3_cfg_t const gw5904_mmc_pads[] = {
+	IOMUX_PADS(PAD_SD2_CLK__SD2_CLK    | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
+	IOMUX_PADS(PAD_SD2_CMD__SD2_CMD    | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
+	IOMUX_PADS(PAD_SD2_DAT0__SD2_DATA0 | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
+	IOMUX_PADS(PAD_SD2_DAT1__SD2_DATA1 | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
+	IOMUX_PADS(PAD_SD2_DAT2__SD2_DATA2 | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
+	IOMUX_PADS(PAD_SD2_DAT3__SD2_DATA3 | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
+	/* CD */
+	IOMUX_PADS(PAD_NANDF_CS0__GPIO6_IO11 | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
+};
 /* 8-bit eMMC on SD2/NAND */
 static iomux_v3_cfg_t const gw560x_emmc_sd2_pads[] = {
 	IOMUX_PADS(PAD_SD2_CLK__SD2_CLK    | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
@@ -412,6 +423,39 @@
 	IOMUX_PADS(PAD_DISP0_DAT5__GPIO4_IO26 | DIO_PAD_CFG),
 };
 
+static iomux_v3_cfg_t const gw5903_gpio_pads[] = {
+	/* BKLT_12VEN */
+	IOMUX_PADS(PAD_GPIO_7__GPIO1_IO07 | DIO_PAD_CFG),
+	/* EMMY_PDN# */
+	IOMUX_PADS(PAD_NANDF_D2__GPIO2_IO02 | DIO_PAD_CFG),
+	/* EMMY_CFG1# */
+	IOMUX_PADS(PAD_NANDF_D3__GPIO2_IO03 | DIO_PAD_CFG),
+	/* EMMY_CFG1# */
+	IOMUX_PADS(PAD_NANDF_D4__GPIO2_IO04 | DIO_PAD_CFG),
+	/* USBH1_PEN (EHCI) */
+	IOMUX_PADS(PAD_EIM_D31__GPIO3_IO31 | DIO_PAD_CFG),
+	/* USBH2_PEN (OTG) */
+	IOMUX_PADS(PAD_KEY_ROW4__GPIO4_IO15 | DIO_PAD_CFG),
+	/* USBDPC_PEN */
+	IOMUX_PADS(PAD_KEY_ROW0__GPIO4_IO07 | DIO_PAD_CFG),
+	/* TOUCH_RST */
+	IOMUX_PADS(PAD_KEY_COL1__GPIO4_IO08 | DIO_PAD_CFG),
+	/* AUDIO_RST# */
+	IOMUX_PADS(PAD_DISP0_DAT23__GPIO5_IO17 | DIO_PAD_CFG),
+	/* UART1_TEN# */
+	IOMUX_PADS(PAD_CSI0_DAT12__GPIO5_IO30 | DIO_PAD_CFG),
+	/* MX6_LOCLED# */
+	IOMUX_PADS(PAD_NANDF_CS1__GPIO6_IO14 | DIO_PAD_CFG),
+	/* LVDS_BKLEN # */
+	IOMUX_PADS(PAD_GPIO_17__GPIO7_IO12 | DIO_PAD_CFG),
+	/* RGMII_PDWN# */
+	IOMUX_PADS(PAD_ENET_CRS_DV__GPIO1_IO25 | DIO_PAD_CFG),
+	/* TOUCH_IRQ# */
+	IOMUX_PADS(PAD_KEY_COL0__GPIO4_IO06 | DIO_PAD_CFG),
+	/* TOUCH_RST# */
+	IOMUX_PADS(PAD_KEY_COL1__GPIO4_IO08 | DIO_PAD_CFG),
+};
+
 static iomux_v3_cfg_t const gw5904_gpio_pads[] = {
 	/* USB_HUBRST# */
 	IOMUX_PADS(PAD_GPIO_9__GPIO1_IO09 | DIO_PAD_CFG),
@@ -688,6 +732,9 @@
 	},
 };
 
+struct dio_cfg gw5903_dio[] = {
+};
+
 struct dio_cfg gw5904_dio[] = {
 	{
 		{ IOMUX_PADS(PAD_SD1_DAT0__GPIO1_IO16) },
@@ -951,6 +998,19 @@
 		.mmc_cd = IMX_GPIO_NR(7, 0),
 	},
 
+	/* GW5903 */
+	{
+		.gpio_pads = gw5903_gpio_pads,
+		.num_pads = ARRAY_SIZE(gw5903_gpio_pads)/2,
+		.dio_cfg = gw5903_dio,
+		.dio_num = ARRAY_SIZE(gw5903_dio),
+		.leds = {
+			IMX_GPIO_NR(6, 14),
+		},
+		.otgpwr_en = IMX_GPIO_NR(4, 15),
+		.mmc_cd = IMX_GPIO_NR(6, 11),
+	},
+
 	/* GW5904 */
 	{
 		.gpio_pads = gw5904_gpio_pads,
@@ -1087,6 +1147,22 @@
 		gpio_request(IMX_GPIO_NR(4, 26), "12p0_en");
 		gpio_direction_output(IMX_GPIO_NR(4, 26), 1);
 		break;
+	case GW5903:
+		gpio_request(IMX_GPIO_NR(3, 31) , "usbh1-ehci_pwr");
+		gpio_direction_output(IMX_GPIO_NR(3, 31), 1);
+		gpio_request(IMX_GPIO_NR(4, 15) , "usbh2-otg_pwr");
+		gpio_direction_output(IMX_GPIO_NR(4, 15), 1);
+		gpio_request(IMX_GPIO_NR(4, 7) , "usbdpc_pwr");
+		gpio_direction_output(IMX_GPIO_NR(4, 15), 1);
+		gpio_request(IMX_GPIO_NR(1, 25) , "rgmii_en");
+		gpio_direction_output(IMX_GPIO_NR(1, 25), 1);
+		gpio_request(IMX_GPIO_NR(4, 6) , "touch_irq#");
+		gpio_direction_input(IMX_GPIO_NR(4, 6));
+		gpio_request(IMX_GPIO_NR(4, 8) , "touch_rst");
+		gpio_direction_output(IMX_GPIO_NR(4, 8), 1);
+		gpio_request(IMX_GPIO_NR(1, 7) , "bklt_12ven");
+		gpio_direction_output(IMX_GPIO_NR(1, 7), 1);
+		break;
 	case GW5904:
 		gpio_request(IMX_GPIO_NR(5, 11), "skt1_wdis#");
 		gpio_direction_output(IMX_GPIO_NR(5, 11), 1);
@@ -1248,6 +1324,13 @@
 			/* set SW3 (VDD_ARM) */
 			pmic_reg_write(p, LTC3676_DVB3A, 0x1f);
 			break;
+		case GW5903:
+			/* mask PGOOD during SW4 transition */
+			pmic_reg_write(p, LTC3676_DVB4B,
+				       0x1f | LTC3676_PGOOD_MASK);
+			/* set SW4 (VDD_SOC) */
+			pmic_reg_write(p, LTC3676_DVB4A, 0x1f);
+			break;
 		default:
 			/* mask PGOOD during SW1 transition */
 			pmic_reg_write(p, LTC3676_DVB1B,
@@ -1299,6 +1382,21 @@
 		usdhc_cfg[1].sdhc_clk = mxc_get_clock(MXC_ESDHC3_CLK);
 		usdhc_cfg[1].max_bus_width = 4;
 		return fsl_esdhc_initialize(bis, &usdhc_cfg[1]);
+	case GW5903:
+		/* usdhc3: 8-bit eMMC */
+		SETUP_IOMUX_PADS(gw5904_emmc_pads);
+		usdhc_cfg[0].esdhc_base = USDHC3_BASE_ADDR;
+		usdhc_cfg[0].sdhc_clk = mxc_get_clock(MXC_ESDHC3_CLK);
+		usdhc_cfg[0].max_bus_width = 8;
+		ret = fsl_esdhc_initialize(bis, &usdhc_cfg[0]);
+		if (ret)
+			return ret;
+		/* usdhc2: 4-bit microSD */
+		SETUP_IOMUX_PADS(gw5904_mmc_pads);
+		usdhc_cfg[1].esdhc_base = USDHC2_BASE_ADDR;
+		usdhc_cfg[1].sdhc_clk = mxc_get_clock(MXC_ESDHC2_CLK);
+		usdhc_cfg[1].max_bus_width = 4;
+		return fsl_esdhc_initialize(bis, &usdhc_cfg[1]);
 	case GW5904:
 		/* usdhc3: 8bit eMMC */
 		SETUP_IOMUX_PADS(gw5904_emmc_pads);
@@ -1326,6 +1424,7 @@
 		if (cfg->esdhc_base == USDHC2_BASE_ADDR)
 			return 1;
 		break;
+	case GW5903:
 	case GW5904:
 		/* emmc is always present */
 		if (cfg->esdhc_base == USDHC3_BASE_ADDR)
diff --git a/board/gateworks/gw_ventana/eeprom.c b/board/gateworks/gw_ventana/eeprom.c
index cfd96b9..2c07a84 100644
--- a/board/gateworks/gw_ventana/eeprom.c
+++ b/board/gateworks/gw_ventana/eeprom.c
@@ -98,6 +98,8 @@
 			type = GW560x;
 		break;
 	case '9':
+		if (info->model[4] == '0' && info->model[5] == '3')
+			type = GW5903;
 		if (info->model[4] == '0' && info->model[5] == '4')
 			type = GW5904;
 		break;
diff --git a/board/gateworks/gw_ventana/gw_ventana.c b/board/gateworks/gw_ventana/gw_ventana.c
index 5f25d8d..dc8cd88 100644
--- a/board/gateworks/gw_ventana/gw_ventana.c
+++ b/board/gateworks/gw_ventana/gw_ventana.c
@@ -227,6 +227,18 @@
 		phy_write(phydev, MDIO_DEVAD_NONE, 22, 0);
 	}
 
+	/* TI DP83867 */
+	else if (phydev->phy_id == 0x2000a231) {
+		/* configure register 0x170 for ref CLKOUT */
+		phy_write(phydev, MDIO_DEVAD_NONE, 13, 0x001f);
+		phy_write(phydev, MDIO_DEVAD_NONE, 14, 0x0170);
+		phy_write(phydev, MDIO_DEVAD_NONE, 13, 0x401f);
+		val = phy_read(phydev, MDIO_DEVAD_NONE, 14);
+		val &= ~0x1f00;
+		val |= 0x0b00; /* chD tx clock*/
+		phy_write(phydev, MDIO_DEVAD_NONE, 14, val);
+	}
+
 	if (phydev->drv->config)
 		phydev->drv->config(phydev);
 
@@ -695,6 +707,7 @@
 	/* NAND: 64pages per block, 3 row addr cycles, 2 copies of FCB/DBBT */
 	{ "nand", MAKE_CFGVAL(0x80, 0x02, 0x00, 0x00) },
 	{ "emmc2", MAKE_CFGVAL(0x60, 0x48, 0x00, 0x00) }, /* GW5600 */
+	{ "emmc3", MAKE_CFGVAL(0x60, 0x50, 0x00, 0x00) }, /* GW5903/GW5904 */
 	{ NULL, 0 },
 };
 #endif
diff --git a/board/gateworks/gw_ventana/gw_ventana_spl.c b/board/gateworks/gw_ventana/gw_ventana_spl.c
index 136b5fc..6060b44 100644
--- a/board/gateworks/gw_ventana/gw_ventana_spl.c
+++ b/board/gateworks/gw_ventana/gw_ventana_spl.c
@@ -374,6 +374,25 @@
 	.p1_mpwrdlctl = 0x383A3930,
 };
 
+static struct mx6_mmdc_calibration mx6sdl_256x64x2_mmdc_calib = {
+	/* write leveling calibration determine */
+	.p0_mpwldectrl0 = 0x001F003F,
+	.p0_mpwldectrl1 = 0x001F001F,
+	.p1_mpwldectrl0 = 0x001F004E,
+	.p1_mpwldectrl1 = 0x0059001F,
+	/* Read DQS Gating calibration */
+	.p0_mpdgctrl0   = 0x42220225,
+	.p0_mpdgctrl1   = 0x0213021F,
+	.p1_mpdgctrl0   = 0x022C0242,
+	.p1_mpdgctrl1   = 0x022C0244,
+	/* Read Calibration: DQS delay relative to DQ read access */
+	.p0_mprddlctl   = 0x474A4C4A,
+	.p1_mprddlctl   = 0x48494C45,
+	/* Write Calibration: DQ/DM delay relative to DQS write access */
+	.p0_mpwrdlctl   = 0x3F3F3F36,
+	.p1_mpwrdlctl   = 0x3F36363F,
+};
+
 static struct mx6_mmdc_calibration mx6dq_512x32_mmdc_calib = {
 	/* write leveling calibration determine */
 	.p0_mpwldectrl0 = 0x002A0025,
@@ -510,10 +529,25 @@
 			calib = &mx6sdl_256x64_mmdc_calib;
 		debug("4gB density\n");
 	} else if (width == 64 && size_mb == 4096) {
-		mem = &mt41k512m16ha_125;
-		if (is_cpu_type(MXC_CPU_MX6Q))
-			calib = &mx6dq_512x64_mmdc_calib;
-		debug("8gB density\n");
+		switch(board_model) {
+		case GW5903:
+			/* 8xMT41K256M16 (4GiB) fly-by mirrored 2-chipsels */
+			mem = &mt41k256m16ha_125;
+			debug("4gB density\n");
+			if (!is_cpu_type(MXC_CPU_MX6Q)) {
+				calib = &mx6sdl_256x64x2_mmdc_calib;
+				sysinfo.ncs = 2;
+				sysinfo.cs_density = 18; /* CS0_END=71 */
+				sysinfo.cs1_mirror = 1; /* mirror enabled */
+			}
+			break;
+		default:
+			mem = &mt41k512m16ha_125;
+			if (is_cpu_type(MXC_CPU_MX6Q))
+				calib = &mx6dq_512x64_mmdc_calib;
+			debug("8gB density\n");
+			break;
+		}
 	}
 
 	if (!(mem && calib)) {
diff --git a/board/gateworks/gw_ventana/ventana_eeprom.h b/board/gateworks/gw_ventana/ventana_eeprom.h
index b6daf9b..8a42d67 100644
--- a/board/gateworks/gw_ventana/ventana_eeprom.h
+++ b/board/gateworks/gw_ventana/ventana_eeprom.h
@@ -113,6 +113,7 @@
 	GW552x,
 	GW553x,
 	GW560x,
+	GW5903,
 	GW5904,
 	GW_UNKNOWN,
 	GW_BADCRC,