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/openrisc/lib/Makefile

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+#
+# (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	+= timer.o

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

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+/*
+ * (C) Copyright 2011 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
+ *
+ * Based on microblaze implementation by:
+ * (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 <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)
+{
+	void	(*kernel) (unsigned int);
+	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
+
+	kernel = (void (*)(unsigned int))images->ep;
+
+	/* find ramdisk */
+	ret = boot_get_ramdisk(argc, argv, images, IH_ARCH_OPENRISC,
+			&rd_data_start, &rd_data_end);
+	if (ret)
+		return 1;
+
+	show_boot_progress(15);
+
+	if (!of_flat_tree && argc > 1)
+		of_flat_tree = (char *)simple_strtoul(argv[1], NULL, 16);
+#ifdef DEBUG
+	printf("## Transferring control to Linux (at address 0x%08lx) " \
+				"ramdisk 0x%08lx, FDT 0x%08lx...\n",
+		(ulong) kernel, rd_data_start, (ulong) of_flat_tree);
+#endif
+	if (dcache_status() || icache_status())
+		flush_cache((ulong)kernel, max(checkdcache(), checkicache()));
+
+	/*
+	 * Linux Kernel Parameters (passing device tree):
+	 * r3: pointer to the fdt, followed by the board info data
+	 */
+	kernel((unsigned int) of_flat_tree);
+	/* does not return */
+
+	return 1;
+}

u-boot/arch/openrisc/lib/timer.c

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+/*
+ * (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
+ * (C) Copyright 2011, Julius Baxter <julius@opencores.org>
+ * (C) Copyright 2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/system.h>
+#include <asm/openrisc_exc.h>
+
+static ulong timestamp;
+
+/* how many counter cycles in a jiffy */
+#define TIMER_COUNTER_CYCLES  (CONFIG_SYS_CLK_FREQ/CONFIG_SYS_OPENRISC_TMR_HZ)
+/* how many ms elapses between each timer interrupt */
+#define TIMER_TIMESTAMP_INC   (1000/CONFIG_SYS_OPENRISC_TMR_HZ)
+/* how many cycles per ms */
+#define TIMER_CYCLES_MS       (CONFIG_SYS_CLK_FREQ/1000)
+/* how many cycles per us */
+#define TIMER_CYCLES_US       (CONFIG_SYS_CLK_FREQ/1000000uL)
+
+void timer_isr(void)
+{
+	timestamp += TIMER_TIMESTAMP_INC;
+	mtspr(SPR_TTMR, SPR_TTMR_IE | SPR_TTMR_RT |
+		(TIMER_COUNTER_CYCLES & SPR_TTMR_TP));
+}
+
+int timer_init(void)
+{
+	/* Install timer exception handler */
+	exception_install_handler(EXC_TIMER, timer_isr);
+
+	/* Set up the timer for the first expiration. */
+	timestamp = 0;
+
+	mtspr(SPR_TTMR, SPR_TTMR_IE | SPR_TTMR_RT |
+		(TIMER_COUNTER_CYCLES & SPR_TTMR_TP));
+
+	/* Enable tick timer exception in supervisor register */
+	mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_TEE);
+
+	return 0;
+}
+
+void reset_timer(void)
+{
+	timestamp = 0;
+
+	mtspr(SPR_TTMR, SPR_TTMR_IE | SPR_TTMR_RT |
+		(TIMER_COUNTER_CYCLES & SPR_TTMR_TP));
+}
+
+/*
+ * The timer value in ms is calculated by taking the
+ * value accumulated by full timer revolutions plus the value
+ * accumulated in this period
+ */
+ulong get_timer(ulong base)
+{
+	return timestamp + mfspr(SPR_TTCR)/TIMER_CYCLES_MS - base;
+}
+
+void set_timer(ulong t)
+{
+	reset_timer();
+	timestamp = t;
+}
+
+unsigned long long get_ticks(void)
+{
+	return get_timer(0);
+}
+
+ulong get_tbclk(void)
+{
+	return CONFIG_SYS_HZ;
+}
+
+void __udelay(ulong usec)
+{
+	ulong elapsed = 0;
+	ulong tick;
+	ulong last_tick;
+
+	last_tick = mfspr(SPR_TTCR);
+	while ((elapsed / TIMER_CYCLES_US) < usec) {
+		tick = mfspr(SPR_TTCR);
+		if (tick >= last_tick)
+			elapsed += (tick - last_tick);
+		else
+			elapsed += TIMER_COUNTER_CYCLES - (last_tick - tick);
+		last_tick = tick;
+	}
+}