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/seaboard/seaboard.c

@@ -0,0 +1,49 @@
+/*
+ *  (C) Copyright 2010,2011
+ *  NVIDIA Corporation <www.nvidia.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/tegra.h>
+#include <asm/arch-tegra/board.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/funcmux.h>
+#include <asm/arch/gpio.h>
+#include <asm/arch/pinmux.h>
+#include <asm/gpio.h>
+
+/* TODO: Remove this code when the SPI switch is working */
+#if (CONFIG_MACH_TYPE != MACH_TYPE_VENTANA)
+void gpio_early_init_uart(void)
+{
+	/* Enable UART via GPIO_PI3 (port 8, bit 3) so serial console works */
+	gpio_request(TEGRA_GPIO(I, 3), "uart_en");
+	gpio_direction_output(TEGRA_GPIO(I, 3), 0);
+}
+#endif
+
+#ifdef CONFIG_TEGRA_MMC
+/*
+ * Routine: pin_mux_mmc
+ * Description: setup the pin muxes/tristate values for the SDMMC(s)
+ */
+void pin_mux_mmc(void)
+{
+	funcmux_select(PERIPH_ID_SDMMC4, FUNCMUX_SDMMC4_ATB_GMA_GME_8_BIT);
+	funcmux_select(PERIPH_ID_SDMMC3, FUNCMUX_SDMMC3_SDB_4BIT);
+
+	/* For power GPIO PI6 */
+	pinmux_tristate_disable(PMUX_PINGRP_ATA);
+	/* For CD GPIO PI5 */
+	pinmux_tristate_disable(PMUX_PINGRP_ATC);
+}
+#endif
+
+void pin_mux_usb(void)
+{
+	/* For USB's GPIO PD0. For now, since we have no pinmux in fdt */
+	pinmux_tristate_disable(PMUX_PINGRP_SLXK);
+}