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/xes/common/fsl_8xxx_clk.c

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2008 Extreme Engineering Solutions, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+
+/*
+ * Return SYSCLK input frequency - 50 MHz or 66 MHz depending on POR config
+ */
+unsigned long get_board_sys_clk(ulong dummy)
+{
+#if defined(CONFIG_MPC85xx)
+	volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
+#elif defined(CONFIG_MPC86xx)
+	immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
+	volatile ccsr_gur_t *gur = &immap->im_gur;
+#endif
+
+	if (in_be32(&gur->gpporcr) & 0x10000)
+		return 66666666;
+	else
+#ifdef CONFIG_P2020
+		return 100000000;
+#else
+		return 50000000;
+#endif
+}
+
+#ifdef CONFIG_MPC85xx
+/*
+ * Return DDR input clock - synchronous with SYSCLK or 66 MHz
+ * Note: 86xx doesn't support asynchronous DDR clk
+ */
+unsigned long get_board_ddr_clk(ulong dummy)
+{
+	volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
+	u32 ddr_ratio = (in_be32(&gur->porpllsr) & 0x00003e00) >> 9;
+
+	if (ddr_ratio == 0x7)
+		return get_board_sys_clk(dummy);
+
+#ifdef CONFIG_P2020
+	if (in_be32(&gur->gpporcr) & 0x20000)
+		return 66666666;
+	else
+		return 100000000;
+#else
+	return 66666666;
+#endif
+}
+#endif