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/compulab/trimslice/trimslice.c

@@ -0,0 +1,42 @@
+/*
+ *  (C) Copyright 2010-2012
+ *  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/clock.h>
+#include <asm/arch/funcmux.h>
+#include <asm/arch/pinmux.h>
+#include <asm/gpio.h>
+#include <i2c.h>
+
+void pin_mux_usb(void)
+{
+	/*
+	 * USB1 internal/external mux GPIO, which masquerades as a VBUS GPIO
+	 * in the current device tree.
+	 */
+	pinmux_tristate_disable(PMUX_PINGRP_UAC);
+}
+
+void pin_mux_spi(void)
+{
+	funcmux_select(PERIPH_ID_SPI1, FUNCMUX_SPI1_GMC_GMD);
+}
+
+/*
+ * Routine: pin_mux_mmc
+ * Description: setup the pin muxes/tristate values for the SDMMC(s)
+ */
+void pin_mux_mmc(void)
+{
+	funcmux_select(PERIPH_ID_SDMMC1, FUNCMUX_SDMMC1_SDIO1_4BIT);
+	funcmux_select(PERIPH_ID_SDMMC4, FUNCMUX_SDMMC4_ATB_GMA_4_BIT);
+
+	/* For CD GPIO PP1 */
+	pinmux_tristate_disable(PMUX_PINGRP_DAP3);
+}