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/microblaze/lib/Makefile

@@ -0,0 +1,9 @@
+#
+# (C) Copyright 2003-2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-$(CONFIG_CMD_BOOTM) += bootm.o
+obj-y	+= muldi3.o

u-boot/arch/microblaze/lib/bootm.c

@@ -0,0 +1,86 @@
+/*
+ * (C) Copyright 2007 Michal Simek
+ * (C) Copyright 2004 Atmark Techno, Inc.
+ *
+ * Michal  SIMEK <monstr@monstr.eu>
+ * Yasushi SHOJI <yashi@atmark-techno.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <fdt_support.h>
+#include <image.h>
+#include <u-boot/zlib.h>
+#include <asm/byteorder.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int do_bootm_linux(int flag, int argc, char * const argv[],
+		   bootm_headers_t *images)
+{
+	/* First parameter is mapped to $r5 for kernel boot args */
+	void	(*thekernel) (char *, ulong, ulong);
+	char	*commandline = getenv("bootargs");
+	ulong	rd_data_start, rd_data_end;
+
+	/*
+	 * allow the PREP bootm subcommand, it is required for bootm to work
+	 */
+	if (flag & BOOTM_STATE_OS_PREP)
+		return 0;
+
+	if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
+		return 1;
+
+	int	ret;
+
+	char	*of_flat_tree = NULL;
+#if defined(CONFIG_OF_LIBFDT)
+	/* did generic code already find a device tree? */
+	if (images->ft_len)
+		of_flat_tree = images->ft_addr;
+#endif
+
+	thekernel = (void (*)(char *, ulong, ulong))images->ep;
+
+	/* find ramdisk */
+	ret = boot_get_ramdisk(argc, argv, images, IH_ARCH_MICROBLAZE,
+			&rd_data_start, &rd_data_end);
+	if (ret)
+		return 1;
+
+	bootstage_mark(BOOTSTAGE_ID_RUN_OS);
+
+	if (!of_flat_tree && argc > 1)
+		of_flat_tree = (char *)simple_strtoul(argv[1], NULL, 16);
+
+	/* fixup the initrd now that we know where it should be */
+	if (images->rd_start && images->rd_end && of_flat_tree)
+		ret = fdt_initrd(of_flat_tree, images->rd_start,
+				 images->rd_end);
+		if (ret)
+			return 1;
+
+#ifdef DEBUG
+	printf("## Transferring control to Linux (at address 0x%08lx) ",
+	       (ulong)thekernel);
+	printf("ramdisk 0x%08lx, FDT 0x%08lx...\n",
+	       rd_data_start, (ulong) of_flat_tree);
+#endif
+
+#ifdef XILINX_USE_DCACHE
+	flush_cache(0, XILINX_DCACHE_BYTE_SIZE);
+#endif
+	/*
+	 * Linux Kernel Parameters (passing device tree):
+	 * r5: pointer to command line
+	 * r6: pointer to ramdisk
+	 * r7: pointer to the fdt, followed by the board info data
+	 */
+	thekernel(commandline, rd_data_start, (ulong)of_flat_tree);
+	/* does not return */
+
+	return 1;
+}

u-boot/arch/microblaze/lib/muldi3.c

@@ -0,0 +1,75 @@
+/*
+ * U-Boot - muldi3.c contains routines for mult and div
+ *
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/* Generic function got from GNU gcc package, libgcc2.c */
+#ifndef SI_TYPE_SIZE
+#define SI_TYPE_SIZE 32
+#endif
+#define __ll_B (1L << (SI_TYPE_SIZE / 2))
+#define __ll_lowpart(t) ((USItype) (t) % __ll_B)
+#define __ll_highpart(t) ((USItype) (t) / __ll_B)
+#define BITS_PER_UNIT 8
+
+#if !defined(umul_ppmm)
+#define umul_ppmm(w1, w0, u, v)						\
+	do {								\
+	USItype __x0, __x1, __x2, __x3;					\
+	USItype __ul, __vl, __uh, __vh;					\
+									\
+		__ul = __ll_lowpart(u);					\
+		__uh = __ll_highpart(u);				\
+		__vl = __ll_lowpart(v);					\
+		__vh = __ll_highpart(v);				\
+									\
+	__x0 = (USItype) __ul * __vl;					\
+	__x1 = (USItype) __ul * __vh;					\
+	__x2 = (USItype) __uh * __vl;					\
+	__x3 = (USItype) __uh * __vh;					\
+									\
+		__x1 += __ll_highpart(__x0); /* this can't give carry */\
+		__x1 += __x2; /* but this indeed can */			\
+		if (__x1 < __x2) /* did we get it? */			\
+		__x3 += __ll_B;	/* yes, add it in the proper pos. */	\
+									\
+		(w1) = __x3 + __ll_highpart(__x1);			\
+		(w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\
+	} while (0)
+#endif
+
+#if !defined(__umulsidi3)
+#define __umulsidi3(u, v)						\
+	({DIunion __w;							\
+	umul_ppmm(__w.s.high, __w.s.low, u, v);		\
+	__w.ll; })
+#endif
+
+typedef unsigned int USItype __attribute__ ((mode(SI)));
+typedef int SItype __attribute__ ((mode(SI)));
+typedef int DItype __attribute__ ((mode(DI)));
+typedef int word_type __attribute__ ((mode(__word__)));
+
+struct DIstruct {
+	SItype low, high;
+};
+typedef union {
+	struct DIstruct s;
+	DItype ll;
+} DIunion;
+
+DItype __muldi3(DItype u, DItype v)
+{
+	DIunion w;
+	DIunion uu, vv;
+
+	uu.ll = u, vv.ll = v;
+	/*  panic("kernel panic for __muldi3"); */
+	w.ll = __umulsidi3(uu.s.low, vv.s.low);
+	w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
+		     + (USItype) uu.s.high * (USItype) vv.s.low);
+
+	return w.ll;
+}