diff --git a/arch/arm/dts/tegra20-colibri.dts b/arch/arm/dts/tegra20-colibri.dts
index 777f63e..89adfb6 100644
--- a/arch/arm/dts/tegra20-colibri.dts
+++ b/arch/arm/dts/tegra20-colibri.dts
@@ -14,42 +14,35 @@
 		i2c0 = "/i2c@7000d000";
 		i2c1 = "/i2c@7000c000";
 		i2c2 = "/i2c@7000c400";
-		usb0 = "/usb@c5008000";
-		usb1 = "/usb@c5000000";
-		usb2 = "/usb@c5004000";
 		mmc0 = "/sdhci@c8000600";
+		usb0 = "/usb@c5000000";
+		usb1 = "/usb@c5004000"; /* on-module only, for ASIX */
+		usb2 = "/usb@c5008000";
 	};
 
 	host1x@50000000 {
-		status = "okay";
 		dc@54200000 {
-			status = "okay";
 			rgb {
 				status = "okay";
 				nvidia,panel = <&lcd_panel>;
+				display-timings {
+					timing@0 {
+						/* VESA VGA */
+						clock-frequency = <25175000>;
+						hactive = <640>;
+						vactive = <480>;
+						hback-porch = <48>;
+						hfront-porch = <16>;
+						hsync-len = <96>;
+						vback-porch = <31>;
+						vfront-porch = <11>;
+						vsync-len = <2>;
+					};
+				};
 			};
 		};
 	};
 
-	usb@c5000000 {
-		statuc = "okay";
-		dr_mode = "otg";
-	};
-
-	usb@c5004000 {
-		statuc = "okay";
-		/* VBUS_LAN */
-		nvidia,phy-reset-gpio = <&gpio TEGRA_GPIO(V, 1)
-			GPIO_ACTIVE_LOW>;
-		nvidia,vbus-gpio = <&gpio TEGRA_GPIO(BB, 1) GPIO_ACTIVE_HIGH>;
-	};
-
-	usb@c5008000 {
-		statuc = "okay";
-		/* USBH_PEN */
-		nvidia,vbus-gpio = <&gpio TEGRA_GPIO(W, 2) GPIO_ACTIVE_LOW>;
-	};
-
 	nand-controller@70008000 {
 		nvidia,wp-gpios = <&gpio TEGRA_GPIO(S, 0) GPIO_ACTIVE_HIGH>;
 		nvidia,width = <8>;
@@ -61,6 +54,10 @@
 		};
 	};
 
+	pwm@7000a000 {
+		status = "okay";
+	};
+
 	/*
 	 * GEN1_I2C: I2C_SDA/SCL on SODIMM pin 194/196 (e.g. RTC on carrier
 	 * board)
@@ -86,12 +83,45 @@
 		clock-frequency = <100000>;
 	};
 
+	/* EHCI instance 0: USB1_DP/N -> USBC_P/N */
+	usb@c5000000 {
+		status = "okay";
+		dr_mode = "otg";
+	};
+
+	/* EHCI instance 1: ULPI -> USB3340 -> AX88772B */
+	usb@c5004000 {
+		status = "okay";
+		/* VBUS_LAN */
+		nvidia,phy-reset-gpio = <&gpio TEGRA_GPIO(V, 1) GPIO_ACTIVE_HIGH>;
+		nvidia,vbus-gpio = <&gpio TEGRA_GPIO(BB, 1) GPIO_ACTIVE_HIGH>;
+	};
+
+	/* EHCI instance 2: USB3_DP/N -> USBH_P/N */
+	usb@c5008000 {
+		status = "okay";
+		/* USBH_PEN */
+		nvidia,vbus-gpio = <&gpio TEGRA_GPIO(W, 2) GPIO_ACTIVE_LOW>;
+	};
+
 	sdhci@c8000600 {
 		status = "okay";
 		bus-width = <4>;
 		cd-gpios = <&gpio TEGRA_GPIO(C, 7) GPIO_ACTIVE_LOW>;
 	};
 
+	backlight: backlight {
+		compatible = "pwm-backlight";
+
+		brightness-levels = <255 128 64 32 16 8 4 0>;
+		default-brightness-level = <6>;
+		/* BL_ON */
+		enable-gpios = <&gpio TEGRA_GPIO(T, 4) GPIO_ACTIVE_HIGH>;
+		power-supply = <&reg_3v3>;
+		/* PWM<A> */
+		pwms = <&pwm 0 5000000>;
+	};
+
 	clocks {
 		compatible = "simple-bus";
 		#address-cells = <1>;
@@ -105,25 +135,28 @@
 		};
 	};
 
-	pwm: pwm@7000a000 {
-		status = "okay";
+	lcd_panel: panel {
+		/*
+		 * edt,et057090dhu: EDT 5.7" LCD TFT
+		 * edt,et070080dh6: EDT 7.0" LCD TFT
+		 */
+		compatible = "edt,et057090dhu", "simple-panel";
+
+		backlight = <&backlight>;
 	};
 
-	lcd_panel: panel {
-		clock = <25175000>;
-		xres = <640>;
-		yres = <480>;
-		left-margin = <48>;	/* horizontal back porch */
-		right-margin = <16>;	/* horizontal front porch */
-		hsync-len = <96>;
-		lower-margin = <11>;	/* vertical front porch */
-		upper-margin = <31>;	/* vertical back porch */
-		vsync-len = <2>;
-		hsync-active-high;
-		vsync-active-high;
-		nvidia,bits-per-pixel = <16>;
-		nvidia,pwm = <&pwm 0 0>;
-		nvidia,backlight-enable-gpios = <&gpio TEGRA_GPIO(T, 4) GPIO_ACTIVE_HIGH>;
-		nvidia,panel-timings = <0 0 0 0>;
+	regulators {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		reg_3v3: regulator@0 {
+			compatible = "regulator-fixed";
+			reg = <0>;
+			regulator-name = "+V3.3";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			regulator-always-on;
+		};
 	};
 };
diff --git a/arch/arm/mach-tegra/arm64-mmu.c b/arch/arm/mach-tegra/arm64-mmu.c
index 7b1d258..a79a519 100644
--- a/arch/arm/mach-tegra/arm64-mmu.c
+++ b/arch/arm/mach-tegra/arm64-mmu.c
@@ -23,7 +23,7 @@
 	}, {
 		.virt = 0x80000000UL,
 		.phys = 0x80000000UL,
-		.size = 0xff80000000UL,
+		.size = 0x80000000UL,
 		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
 			 PTE_BLOCK_INNER_SHARE
 	}, {
diff --git a/drivers/power/regulator/fixed.c b/drivers/power/regulator/fixed.c
index 37b8400..62dc47f 100644
--- a/drivers/power/regulator/fixed.c
+++ b/drivers/power/regulator/fixed.c
@@ -37,11 +37,15 @@
 	/* Set type to fixed */
 	uc_pdata->type = REGULATOR_TYPE_FIXED;
 
-	/* Get fixed regulator gpio desc */
+	/* Get fixed regulator optional enable GPIO desc */
 	gpio = &dev_pdata->gpio;
 	ret = gpio_request_by_name(dev, "gpio", 0, gpio, GPIOD_IS_OUT);
-	if (ret)
-		debug("Fixed regulator gpio - not found! Error: %d", ret);
+	if (ret) {
+		debug("Fixed regulator optional enable GPIO - not found! Error: %d\n",
+		      ret);
+		if (ret != -ENOENT)
+			return ret;
+	}
 
 	/* Get optional ramp up delay */
 	dev_pdata->startup_delay_us = fdtdec_get_uint(gd->fdt_blob,
@@ -87,8 +91,9 @@
 {
 	struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
 
+	/* Enable GPIO is optional */
 	if (!dev_pdata->gpio.dev)
-		return false;
+		return true;
 
 	return dm_gpio_get_value(&dev_pdata->gpio);
 }
@@ -98,8 +103,12 @@
 	struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
 	int ret;
 
-	if (!dev_pdata->gpio.dev)
-		return -ENOSYS;
+	/* Enable GPIO is optional */
+	if (!dev_pdata->gpio.dev) {
+		if (!enable)
+			return -ENOSYS;
+		return 0;
+	}
 
 	ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
 	if (ret) {
diff --git a/drivers/video/simple_panel.c b/drivers/video/simple_panel.c
index b2fe345..baa95f6 100644
--- a/drivers/video/simple_panel.c
+++ b/drivers/video/simple_panel.c
@@ -42,7 +42,7 @@
 		ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
 						   "power-supply", &priv->reg);
 		if (ret) {
-			debug("%s: Warning: cnnot get power supply: ret=%d\n",
+			debug("%s: Warning: cannot get power supply: ret=%d\n",
 			      __func__, ret);
 			if (ret != -ENOENT)
 				return ret;
diff --git a/include/configs/tegra-common-usb-gadget.h b/include/configs/tegra-common-usb-gadget.h
index 00f854e..58a5a30 100644
--- a/include/configs/tegra-common-usb-gadget.h
+++ b/include/configs/tegra-common-usb-gadget.h
@@ -10,7 +10,9 @@
 
 #ifndef CONFIG_SPL_BUILD
 /* USB gadget mode support*/
+#ifndef CONFIG_TEGRA20
 #define CONFIG_CI_UDC_HAS_HOSTPC
+#endif
 /* USB mass storage protocol */
 #define CONFIG_USB_FUNCTION_MASS_STORAGE
 /* DFU protocol */