avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/board/nvidia/whistler/Kconfig

@@ -0,0 +1,12 @@
+if TARGET_WHISTLER
+
+config SYS_BOARD
+	default "whistler"
+
+config SYS_VENDOR
+	default "nvidia"
+
+config SYS_CONFIG_NAME
+	default "whistler"
+
+endif

u-boot/board/nvidia/whistler/MAINTAINERS

@@ -0,0 +1,7 @@
+WHISTLER BOARD
+M:	Tom Warren <twarren@nvidia.com>
+M:	Stephen Warren <swarren@nvidia.com>
+S:	Maintained
+F:	board/nvidia/whistler/
+F:	include/configs/whistler.h
+F:	configs/whistler_defconfig

u-boot/board/nvidia/whistler/Makefile

@@ -0,0 +1,8 @@
+#
+#  (C) Copyright 2010-2012
+#  NVIDIA Corporation <www.nvidia.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y	:= whistler.o

u-boot/board/nvidia/whistler/whistler.c

@@ -0,0 +1,80 @@
+/*
+ *  (C) Copyright 2010-2012
+ *  NVIDIA Corporation <www.nvidia.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <asm/io.h>
+#include <asm/arch/tegra.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/funcmux.h>
+#include <asm/arch/pinmux.h>
+#include <asm/gpio.h>
+#include <i2c.h>
+
+#ifdef CONFIG_TEGRA_MMC
+/*
+ * Routine: pin_mux_mmc
+ * Description: setup the pin muxes/tristate values for the SDMMC(s)
+ */
+void pin_mux_mmc(void)
+{
+	struct udevice *dev;
+	uchar val;
+	int ret;
+
+	/* Turn on MAX8907B LDO12 to 2.8V for J40 power */
+	ret = i2c_get_chip_for_busnum(0, 0x3c, 1, &dev);
+	if (ret) {
+		printf("%s: Cannot find MAX8907B I2C chip\n", __func__);
+		return;
+	}
+	val = 0x29;
+	ret = dm_i2c_write(dev, 0x46, &val, 1);
+	if (ret)
+		printf("i2c_write 0 0x3c 0x46 failed: %d\n", ret);
+	val = 0x00;
+	ret = dm_i2c_write(dev, 0x45, &val, 1);
+	if (ret)
+		printf("i2c_write 0 0x3c 0x45 failed: %d\n", ret);
+	val = 0x1f;
+	ret = dm_i2c_write(dev, 0x44, &val, 1);
+	if (ret)
+		printf("i2c_write 0 0x3c 0x44 failed: %d\n", ret);
+
+	funcmux_select(PERIPH_ID_SDMMC3, FUNCMUX_SDMMC3_SDB_SLXA_8BIT);
+	funcmux_select(PERIPH_ID_SDMMC4, FUNCMUX_SDMMC4_ATC_ATD_8BIT);
+}
+#endif
+
+/* this is a weak define that we are overriding */
+void pin_mux_usb(void)
+{
+	struct udevice *dev;
+	uchar val;
+	int ret;
+
+	/*
+	 * This is a hack. This should be represented in DT using the
+	 * vbus-gpio property. However, U-Boot's DT support doesn't
+	 * support any GPIO controller other than the Tegra's yet.
+	 */
+
+	/* Turn on TAC6416's GPIO 0+1 for USB1/3's VBUS */
+	ret = i2c_get_chip_for_busnum(0, 0x20, 1, &dev);
+	if (ret) {
+		printf("%s: Cannot find TAC6416 I2C chip\n", __func__);
+		return;
+	}
+	val = 0x03;
+	ret = dm_i2c_write(dev, 2, &val, 1);
+	if (ret)
+		printf("i2c_write 0 0x20 2 failed: %d\n", ret);
+	val = 0xfc;
+	ret = dm_i2c_write(dev, 6, &val, 1);
+	if (ret)
+		printf("i2c_write 0 0x20 6 failed: %d\n", ret);
+}