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/nyan-big/nyan-big.c

@@ -0,0 +1,129 @@
+/*
+ * (C) Copyright 2014
+ * NVIDIA Corporation <www.nvidia.com>
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <asm/arch/pinmux.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/mc.h>
+#include <asm/arch-tegra/clk_rst.h>
+#include <asm/arch-tegra/pmc.h>
+#include <power/as3722.h>
+#include <power/pmic.h>
+#include "pinmux-config-nyan-big.h"
+
+/*
+ * Routine: pinmux_init
+ * Description: Do individual peripheral pinmux configs
+ */
+void pinmux_init(void)
+{
+	gpio_config_table(nyan_big_gpio_inits,
+			  ARRAY_SIZE(nyan_big_gpio_inits));
+
+	pinmux_config_pingrp_table(nyan_big_pingrps,
+				   ARRAY_SIZE(nyan_big_pingrps));
+
+	pinmux_config_drvgrp_table(nyan_big_drvgrps,
+				   ARRAY_SIZE(nyan_big_drvgrps));
+}
+
+int tegra_board_id(void)
+{
+	static const int vector[] = {TEGRA_GPIO(Q, 3), TEGRA_GPIO(T, 1),
+					TEGRA_GPIO(X, 1), TEGRA_GPIO(X, 4),
+					-1};
+
+	gpio_claim_vector(vector, "board_id%d");
+	return gpio_get_values_as_int(vector);
+}
+
+int tegra_lcd_pmic_init(int board_id)
+{
+	struct udevice *pmic;
+	int ret;
+
+	ret = as3722_get(&pmic);
+	if (ret)
+		return -ENOENT;
+
+	if (board_id == 0)
+		as3722_write(pmic, 0x00, 0x3c);
+	else
+		as3722_write(pmic, 0x00, 0x50);
+	as3722_write(pmic, 0x12, 0x10);
+	as3722_write(pmic, 0x0c, 0x07);
+	as3722_write(pmic, 0x20, 0x10);
+
+	return 0;
+}
+
+/* Setup required information for Linux kernel */
+static void setup_kernel_info(void)
+{
+	struct mc_ctlr *mc = (void *)NV_PA_MC_BASE;
+
+	/* The kernel graphics driver needs this region locked down */
+	writel(0, &mc->mc_video_protect_bom);
+	writel(0, &mc->mc_video_protect_size_mb);
+	writel(1, &mc->mc_video_protect_reg_ctrl);
+}
+
+/*
+ * We need to take ALL audio devices conntected to AHUB (AUDIO, APBIF,
+ * I2S, DAM, AMX, ADX, SPDIF, AFC) out of reset and enable the clocks.
+ * Otherwise reading AHUB devices will hang when the kernel boots.
+ */
+static void enable_required_clocks(void)
+{
+	static enum periph_id ids[] = {
+		PERIPH_ID_I2S0,
+		PERIPH_ID_I2S1,
+		PERIPH_ID_I2S2,
+		PERIPH_ID_I2S3,
+		PERIPH_ID_I2S4,
+		PERIPH_ID_AUDIO,
+		PERIPH_ID_APBIF,
+		PERIPH_ID_DAM0,
+		PERIPH_ID_DAM1,
+		PERIPH_ID_DAM2,
+		PERIPH_ID_AMX0,
+		PERIPH_ID_AMX1,
+		PERIPH_ID_ADX0,
+		PERIPH_ID_ADX1,
+		PERIPH_ID_SPDIF,
+		PERIPH_ID_AFC0,
+		PERIPH_ID_AFC1,
+		PERIPH_ID_AFC2,
+		PERIPH_ID_AFC3,
+		PERIPH_ID_AFC4,
+		PERIPH_ID_AFC5,
+		PERIPH_ID_EXTPERIPH1
+	};
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ids); i++)
+		clock_enable(ids[i]);
+	udelay(2);
+	for (i = 0; i < ARRAY_SIZE(ids); i++)
+		reset_set_enable(ids[i], 0);
+}
+
+int nvidia_board_init(void)
+{
+	clock_start_periph_pll(PERIPH_ID_EXTPERIPH1, CLOCK_ID_OSC, 12000000);
+	clock_start_periph_pll(PERIPH_ID_I2S1, CLOCK_ID_OSC, 1500000);
+
+	/* For external MAX98090 audio codec */
+	clock_external_output(1);
+	setup_kernel_info();
+	enable_required_clocks();
+
+	return 0;
+}