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/microchip/pic32mzda/Kconfig

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+
+if TARGET_PIC32MZDASK
+
+config SYS_BOARD
+	default "pic32mzda"
+
+config SYS_VENDOR
+	default "microchip"
+
+config SYS_CONFIG_NAME
+	default "pic32mzdask"
+
+config SYS_TEXT_BASE
+	default 0x9d004000
+
+endif

u-boot/board/microchip/pic32mzda/MAINTAINERS

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+PIC32MZDASK BOARD
+M:	Purna Chandra Mandal <purna.mandal@microchip.com>
+S:	Maintained
+F:	board/microchip/pic32mzda/
+F:	include/configs/pic32mzdask.h
+F:	configs/pic32mzdask_defconfig

u-boot/board/microchip/pic32mzda/Makefile

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+#
+# (C) Copyright 2015
+# Purna Chandra Mandal, purna.mandal@microchip.com.
+#
+# SPDX-License-Identifier:      GPL-2.0+
+#
+obj-y := pic32mzda.o

u-boot/board/microchip/pic32mzda/README

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+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ */
+
+PIC32MZ[DA] Starter Kit
+----------------------------------------
+PIC32MZ[DA] Starter Kit is based on PIC32MZ[DA] family of micro-controller.
+This family is powered by MIPS M14KEC 32bit general purpose core and has
+advanced microcontroller features and peripherals.
+
+This processor boots with proprietary stage1 bootloader running from internal
+boot-flash. Stage1 bootloader inturns locates and jumps to U-Boot programmed
+on internal program-flash. Finally U-Boot loads OS image (along with other
+required files for booting) from either uSD card, or ethernet, or from USB
+storage.
+
+To boot Linux following three files are mandatory - uEnv.txt (custom U-Boot
+environment file), uImage, *.dtb (platform device-tree-blob file).
+
+U-Boot jumps to Linux using UHI specification.
+
+Visit http://microchip.com for details.

u-boot/board/microchip/pic32mzda/pic32mzda.c

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+/*
+ * Microchip PIC32MZ[DA] Starter Kit board
+ *
+ * Copyright (C) 2015, Microchip Technology Inc.
+ * Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <clk.h>
+#include <dt-bindings/clock/microchip,clock.h>
+#include <mach/pic32.h>
+
+#ifdef CONFIG_DISPLAY_BOARDINFO
+int checkboard(void)
+{
+	ulong rate;
+	struct udevice *dev;
+	struct clk clk;
+	int ret;
+
+	printf("Core: %s\n", get_core_name());
+
+	if (uclass_get_device(UCLASS_CLK, 0, &dev))
+		return 0;
+
+	clk.id = PB7CLK;
+	ret = clk_request(dev, &clk);
+	if (ret < 0)
+		return 0;
+
+	rate = clk_get_rate(&clk);
+	printf("CPU Speed: %lu MHz\n", rate / 1000000);
+
+	clk_free(&clk);
+
+	return 0;
+}
+#endif