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/arch/arm/mach-exynos/system.c

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2012 Samsung Electronics
+ * Donghwa Lee <dh09.lee@samsung.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/system.h>
+
+static void exynos5_set_usbhost_mode(unsigned int mode)
+{
+	struct exynos5_sysreg *sysreg =
+		(struct exynos5_sysreg *)samsung_get_base_sysreg();
+
+	/* Setting USB20PHY_CONFIG register to USB 2.0 HOST link */
+	if (mode == USB20_PHY_CFG_HOST_LINK_EN) {
+		setbits_le32(&sysreg->usb20phy_cfg,
+				USB20_PHY_CFG_HOST_LINK_EN);
+	} else {
+		clrbits_le32(&sysreg->usb20phy_cfg,
+				USB20_PHY_CFG_HOST_LINK_EN);
+	}
+}
+
+void set_usbhost_mode(unsigned int mode)
+{
+	if (cpu_is_exynos5())
+		exynos5_set_usbhost_mode(mode);
+}
+
+static void exynos4_set_system_display(void)
+{
+	struct exynos4_sysreg *sysreg =
+	    (struct exynos4_sysreg *)samsung_get_base_sysreg();
+	unsigned int cfg = 0;
+
+	/*
+	 * system register path set
+	 * 0: MIE/MDNIE
+	 * 1: FIMD Bypass
+	 */
+	cfg = readl(&sysreg->display_ctrl);
+	cfg |= (1 << 1);
+	writel(cfg, &sysreg->display_ctrl);
+}
+
+static void exynos5_set_system_display(void)
+{
+	struct exynos5_sysreg *sysreg =
+	    (struct exynos5_sysreg *)samsung_get_base_sysreg();
+	unsigned int cfg = 0;
+
+	/*
+	 * system register path set
+	 * 0: MIE/MDNIE
+	 * 1: FIMD Bypass
+	 */
+	cfg = readl(&sysreg->disp1blk_cfg);
+	cfg |= (1 << 15);
+	writel(cfg, &sysreg->disp1blk_cfg);
+}
+
+void set_system_display_ctrl(void)
+{
+	if (cpu_is_exynos4())
+		exynos4_set_system_display();
+	else
+		exynos5_set_system_display();
+}