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/kylin/kylin_rk3036/Kconfig

@@ -0,0 +1,15 @@
+if TARGET_KYLIN_RK3036
+
+config SYS_BOARD
+	default "kylin_rk3036"
+
+config SYS_VENDOR
+	default "kylin"
+
+config SYS_CONFIG_NAME
+	default "kylin_rk3036"
+
+config BOARD_SPECIFIC_OPTIONS # dummy
+	def_bool y
+
+endif

u-boot/board/kylin/kylin_rk3036/Makefile

@@ -0,0 +1,7 @@
+#
+# (C) Copyright 2015 Google, Inc
+#
+# SPDX-License-Identifier:     GPL-2.0+
+#
+
+obj-y	+= kylin_rk3036.o

u-boot/board/kylin/kylin_rk3036/kylin_rk3036.c

@@ -0,0 +1,81 @@
+/*
+ * (C) Copyright 2015 Rockchip Electronics Co., Ltd
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <asm/io.h>
+#include <asm/arch/uart.h>
+#include <asm/arch-rockchip/grf_rk3036.h>
+#include <asm/arch/sdram_rk3036.h>
+#include <asm/gpio.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define GRF_BASE	0x20008000
+
+void get_ddr_config(struct rk3036_ddr_config *config)
+{
+	/* K4B4G1646Q config */
+	config->ddr_type = 3;
+	config->rank = 1;
+	config->cs0_row = 15;
+	config->cs1_row = 15;
+
+	/* 8bank */
+	config->bank = 3;
+	config->col = 10;
+
+	/* 16bit bw */
+	config->bw = 1;
+}
+
+#define FASTBOOT_KEY_GPIO 93
+
+int fastboot_key_pressed(void)
+{
+	gpio_request(FASTBOOT_KEY_GPIO, "fastboot_key");
+	gpio_direction_input(FASTBOOT_KEY_GPIO);
+	return !gpio_get_value(FASTBOOT_KEY_GPIO);
+}
+
+#define ROCKCHIP_BOOT_MODE_FASTBOOT	0x5242C309
+
+int board_late_init(void)
+{
+	struct rk3036_grf * const grf = (void *)GRF_BASE;
+	int boot_mode = readl(&grf->os_reg[4]);
+
+	/* Clear boot mode */
+	writel(0, &grf->os_reg[4]);
+
+	if (boot_mode == ROCKCHIP_BOOT_MODE_FASTBOOT ||
+	    fastboot_key_pressed()) {
+		printf("enter fastboot!\n");
+		setenv("preboot", "setenv preboot; fastboot usb0");
+	}
+
+	return 0;
+}
+
+int board_init(void)
+{
+	return 0;
+}
+
+int dram_init(void)
+{
+	gd->ram_size = sdram_size();
+
+	return 0;
+}
+
+#ifndef CONFIG_SYS_DCACHE_OFF
+void enable_caches(void)
+{
+	/* Enable D-cache. I-cache is already enabled in start.S */
+	dcache_enable();
+}
+#endif