diff --git a/board/gateworks/gw_ventana/eeprom.c b/board/gateworks/gw_ventana/eeprom.c
index ab3bab847a..ba159696b4 100644
--- a/board/gateworks/gw_ventana/eeprom.c
+++ b/board/gateworks/gw_ventana/eeprom.c
@@ -81,8 +81,14 @@ read_eeprom(int bus, struct ventana_board_info *info)
 		type = GW54xx;
 		break;
 	case '5':
-		type = GW552x;
-		break;
+		if (info->model[4] == '1') {
+			type = GW551x;
+			break;
+		} else if (info->model[4] == '2') {
+			type = GW552x;
+			break;
+		}
+		/* fall through */
 	default:
 		printf("EEPROM: Unknown model in EEPROM: %s\n", info->model);
 		type = GW_UNKNOWN;
diff --git a/board/gateworks/gw_ventana/gw_ventana.c b/board/gateworks/gw_ventana/gw_ventana.c
index 9ea24f43f7..16f3e90534 100644
--- a/board/gateworks/gw_ventana/gw_ventana.c
+++ b/board/gateworks/gw_ventana/gw_ventana.c
@@ -400,7 +400,7 @@ int board_eth_init(bd_t *bis)
 	setup_iomux_enet();
 
 #ifdef CONFIG_FEC_MXC
-	if (board_type != GW552x)
+	if (board_type != GW551x && board_type != GW552x)
 		cpu_eth_init(bis);
 #endif
 
@@ -679,6 +679,15 @@ static iomux_v3_cfg_t const gw54xx_gpio_pads[] = {
 	IOMUX_PADS(PAD_DISP0_DAT23__GPIO5_IO17 | DIO_PAD_CFG),
 };
 
+static iomux_v3_cfg_t const gw551x_gpio_pads[] = {
+	/* PANLED# */
+	IOMUX_PADS(PAD_KEY_ROW0__GPIO4_IO07 | DIO_PAD_CFG),
+	/* PCI_RST# */
+	IOMUX_PADS(PAD_GPIO_0__GPIO1_IO00 | DIO_PAD_CFG),
+	/* PCIESKT_WDIS# */
+	IOMUX_PADS(PAD_GPIO_17__GPIO7_IO12 | DIO_PAD_CFG),
+};
+
 static iomux_v3_cfg_t const gw552x_gpio_pads[] = {
 	/* PANLEDG# */
 	IOMUX_PADS(PAD_KEY_COL0__GPIO4_IO06 | DIO_PAD_CFG),
@@ -720,6 +729,7 @@ struct ventana {
 	int num_pads;
 	/* DIO pinmux/val */
 	struct dio_cfg dio_cfg[4];
+	int num_gpios;
 	/* various gpios (0 if non-existent) */
 	int leds[3];
 	int pcie_rst;
@@ -765,6 +775,7 @@ static struct ventana gpio_cfg[] = {
 				4
 			},
 		},
+		.num_gpios = 4,
 		.leds = {
 			IMX_GPIO_NR(4, 6),
 			IMX_GPIO_NR(4, 10),
@@ -808,6 +819,7 @@ static struct ventana gpio_cfg[] = {
 				4
 			},
 		},
+		.num_gpios = 4,
 		.leds = {
 			IMX_GPIO_NR(4, 6),
 			IMX_GPIO_NR(4, 10),
@@ -850,6 +862,7 @@ static struct ventana gpio_cfg[] = {
 				0
 			},
 		},
+		.num_gpios = 4,
 		.leds = {
 			IMX_GPIO_NR(4, 6),
 			IMX_GPIO_NR(4, 7),
@@ -894,6 +907,7 @@ static struct ventana gpio_cfg[] = {
 				0
 			},
 		},
+		.num_gpios = 4,
 		.leds = {
 			IMX_GPIO_NR(4, 6),
 			IMX_GPIO_NR(4, 7),
@@ -937,6 +951,7 @@ static struct ventana gpio_cfg[] = {
 				4
 			},
 		},
+		.num_gpios = 4,
 		.leds = {
 			IMX_GPIO_NR(4, 6),
 			IMX_GPIO_NR(4, 7),
@@ -952,10 +967,10 @@ static struct ventana gpio_cfg[] = {
 		.wdis = IMX_GPIO_NR(5, 17),
 	},
 
-	/* GW552x */
+	/* GW551x */
 	{
-		.gpio_pads = gw552x_gpio_pads,
-		.num_pads = ARRAY_SIZE(gw552x_gpio_pads)/2,
+		.gpio_pads = gw551x_gpio_pads,
+		.num_pads = ARRAY_SIZE(gw551x_gpio_pads)/2,
 		.dio_cfg = {
 			{
 				{ IOMUX_PADS(PAD_SD1_DAT0__GPIO1_IO16) },
@@ -976,12 +991,39 @@ static struct ventana gpio_cfg[] = {
 				3
 			},
 			{
-				{ IOMUX_PADS(PAD_SD1_CLK__GPIO1_IO20) },
-				IMX_GPIO_NR(2, 10),
-				{ 0, 0 },
-				0
+				{ IOMUX_PADS(PAD_SD1_CMD__GPIO1_IO18) },
+				IMX_GPIO_NR(1, 18),
+				{ IOMUX_PADS(PAD_SD1_CMD__PWM4_OUT) },
+				4
 			},
 		},
+		.num_gpios = 2,
+		.leds = {
+			IMX_GPIO_NR(4, 7),
+		},
+		.pcie_rst = IMX_GPIO_NR(1, 0),
+		.wdis = IMX_GPIO_NR(7, 12),
+	},
+
+	/* GW552x */
+	{
+		.gpio_pads = gw552x_gpio_pads,
+		.num_pads = ARRAY_SIZE(gw552x_gpio_pads)/2,
+		.dio_cfg = {
+			{
+				{ IOMUX_PADS(PAD_SD1_DAT2__GPIO1_IO19) },
+				IMX_GPIO_NR(1, 19),
+				{ IOMUX_PADS(PAD_SD1_DAT2__PWM2_OUT) },
+				2
+			},
+			{
+				{ IOMUX_PADS(PAD_SD1_DAT1__GPIO1_IO17) },
+				IMX_GPIO_NR(1, 17),
+				{ IOMUX_PADS(PAD_SD1_DAT1__PWM3_OUT) },
+				3
+			},
+		},
+		.num_gpios = 4,
 		.leds = {
 			IMX_GPIO_NR(4, 6),
 			IMX_GPIO_NR(4, 7),
@@ -1138,6 +1180,8 @@ static void setup_board_gpio(int board)
 		iomux_v3_cfg_t ctrl = DIO_PAD_CFG;
 		unsigned cputype = is_cpu_type(MXC_CPU_MX6Q) ? 0 : 1;
 
+		if (!cfg->gpio_padmux[0] && !cfg->gpio_padmux[1])
+			continue;
 		sprintf(arg, "dio%d", i);
 		if (!hwconfig(arg))
 			continue;
@@ -1430,7 +1474,7 @@ int misc_init_r(void)
 				sprintf(fdt, "%s-%s.dtb", cputype, str);
 				setenv("fdt_file1", fdt);
 			}
-			if (board_type != GW552x)
+			if (board_type != GW551x && board_type != GW552x)
 				str[4] = 'x';
 			str[5] = 'x';
 			str[6] = 0;
diff --git a/board/gateworks/gw_ventana/gw_ventana_spl.c b/board/gateworks/gw_ventana/gw_ventana_spl.c
index 97fd346ebf..668e1122e8 100644
--- a/board/gateworks/gw_ventana/gw_ventana_spl.c
+++ b/board/gateworks/gw_ventana/gw_ventana_spl.c
@@ -220,6 +220,50 @@ static struct mx6_ddr3_cfg mt41k256m16ha_125 = {
  * calibration - these are the various CPU/DDR3 combinations we support
  */
 
+static struct mx6_mmdc_calibration mx6dq_128x16_mmdc_calib = {
+	/* write leveling calibration determine */
+	.p0_mpwldectrl0 = 0x00190017,
+	/* Read DQS Gating calibration */
+	.p0_mpdgctrl0 = 0x43380347,
+	/* Read Calibration: DQS delay relative to DQ read access */
+	.p0_mprddlctl = 0x3C313539,
+	/* Write Calibration: DQ/DM delay relative to DQS write access */
+	.p0_mpwrdlctl = 0x36393C39,
+};
+
+static struct mx6_mmdc_calibration mx6dq_256x16_mmdc_calib = {
+	/* write leveling calibration determine */
+	.p0_mpwldectrl0 = 0x00190017,
+	/* Read DQS Gating calibration */
+	.p0_mpdgctrl0 = 0x43380347,
+	/* Read Calibration: DQS delay relative to DQ read access */
+	.p0_mprddlctl = 0x3C313539,
+	/* Write Calibration: DQ/DM delay relative to DQS write access */
+	.p0_mpwrdlctl = 0x36393C39,
+};
+
+static struct mx6_mmdc_calibration mx6sdl_128x16_mmdc_calib = {
+	/* write leveling calibration determine */
+	.p0_mpwldectrl0 = 0x00190017,
+	/* Read DQS Gating calibration */
+	.p0_mpdgctrl0 = 0x43380347,
+	/* Read Calibration: DQS delay relative to DQ read access */
+	.p0_mprddlctl = 0x3C313539,
+	/* Write Calibration: DQ/DM delay relative to DQS write access */
+	.p0_mpwrdlctl = 0x36393C39,
+};
+
+static struct mx6_mmdc_calibration mx6sdl_256x16_mmdc_calib = {
+	/* write leveling calibration determine */
+	.p0_mpwldectrl0 = 0x00190017,
+	/* Read DQS Gating calibration */
+	.p0_mpdgctrl0 = 0x43380347,
+	/* Read Calibration: DQS delay relative to DQ read access */
+	.p0_mprddlctl = 0x3C313539,
+	/* Write Calibration: DQ/DM delay relative to DQS write access */
+	.p0_mpwrdlctl = 0x36393C39,
+};
+
 static struct mx6_mmdc_calibration mx6dq_128x32_mmdc_calib = {
 	/* write leveling calibration determine */
 	.p0_mpwldectrl0 = 0x00190017,
@@ -363,7 +407,21 @@ static void spl_dram_init(int width, int size_mb, int board_model)
 	 *   mx6_ddr_sysinfo - board-specific memory architecture (width/cs/etc)
 	 *   mx6_ddr_cfg - chip specific timing/layout details
 	 */
-	if (width == 32 && size_mb == 512) {
+	if (width == 16 && size_mb == 256) {
+		mem = &mt41k128m16jt_125;
+		if (is_cpu_type(MXC_CPU_MX6Q))
+			calib = &mx6dq_128x16_mmdc_calib;
+		else
+			calib = &mx6sdl_128x16_mmdc_calib;
+		debug("2gB density\n");
+	} else if (width == 16 && size_mb == 512) {
+		mem = &mt41k256m16ha_125;
+		if (is_cpu_type(MXC_CPU_MX6Q))
+			calib = &mx6dq_256x16_mmdc_calib;
+		else
+			calib = &mx6sdl_256x16_mmdc_calib;
+		debug("4gB density\n");
+	} else if (width == 32 && size_mb == 512) {
 		mem = &mt41k128m16jt_125;
 		if (is_cpu_type(MXC_CPU_MX6Q))
 			calib = &mx6dq_128x32_mmdc_calib;
diff --git a/board/gateworks/gw_ventana/ventana_eeprom.h b/board/gateworks/gw_ventana/ventana_eeprom.h
index af12711ac2..daff375e40 100644
--- a/board/gateworks/gw_ventana/ventana_eeprom.h
+++ b/board/gateworks/gw_ventana/ventana_eeprom.h
@@ -109,6 +109,7 @@ enum {
 	GW52xx,
 	GW53xx,
 	GW54xx,
+	GW551x,
 	GW552x,
 	GW_UNKNOWN,
 	GW_BADCRC,