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/freescale/t104xrdb/ddr.h

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2013 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __DDR_H__
+#define __DDR_H__
+struct board_specific_parameters {
+	u32 n_ranks;
+	u32 datarate_mhz_high;
+	u32 rank_gb;
+	u32 clk_adjust;
+	u32 wrlvl_start;
+	u32 wrlvl_ctl_2;
+	u32 wrlvl_ctl_3;
+};
+
+/*
+ * These tables contain all valid speeds we want to override with board
+ * specific parameters. datarate_mhz_high values need to be in ascending order
+ * for each n_ranks group.
+ */
+
+static const struct board_specific_parameters udimm0[] = {
+	/*
+	 * memory controller 0
+	 *   num|  hi| rank|  clk| wrlvl |   wrlvl
+	 * ranks| mhz| GB  |adjst| start |   ctl2
+	 */
+#ifdef CONFIG_SYS_FSL_DDR4
+	{2,  1600, 4, 8,     6, 0x07090A0c, 0x0e0f100a},
+#elif defined(CONFIG_SYS_FSL_DDR3)
+	{2,  833,  4, 8,     6, 0x06060607, 0x08080807},
+	{2,  833,  0, 8,     6, 0x06060607, 0x08080807},
+	{2,  1350, 4, 8,     7, 0x0708080A, 0x0A0B0C09},
+	{2,  1350, 0, 8,     7, 0x0708080A, 0x0A0B0C09},
+	{2,  1666, 4, 8,     7, 0x0808090B, 0x0C0D0E0A},
+	{2,  1666, 0, 8,     7, 0x0808090B, 0x0C0D0E0A},
+	{1,  833,  4, 8,     6, 0x06060607, 0x08080807},
+	{1,  833,  0, 8,     6, 0x06060607, 0x08080807},
+	{1,  1350, 4, 8,     7, 0x0708080A, 0x0A0B0C09},
+	{1,  1350, 0, 8,     7, 0x0708080A, 0x0A0B0C09},
+	{1,  1666, 4, 8,     7, 0x0808090B, 0x0C0D0E0A},
+	{1,  1666, 0, 8,     7, 0x0808090B, 0x0C0D0E0A},
+#else
+#error DDR type not defined
+#endif
+	{}
+};
+
+#endif
+
+static const struct board_specific_parameters *udimms[] = {
+	udimm0,
+};