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-at91/spl_at91.c

@@ -0,0 +1,133 @@
+/*
+ * (C) Copyright 2014 DENX Software Engineering
+ *     Heiko Schocher <hs@denx.de>
+ *
+ * Based on:
+ * Copyright (C) 2013 Atmel Corporation
+ *		      Bo Shen <voice.shen@atmel.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/at91_common.h>
+#include <asm/arch/at91sam9_matrix.h>
+#include <asm/arch/at91_pit.h>
+#include <asm/arch/at91_rstc.h>
+#include <asm/arch/at91_wdt.h>
+#include <asm/arch/clk.h>
+#include <spl.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static void enable_ext_reset(void)
+{
+	struct at91_rstc *rstc = (struct at91_rstc *)ATMEL_BASE_RSTC;
+
+	writel(AT91_RSTC_KEY | AT91_RSTC_MR_URSTEN, &rstc->mr);
+}
+
+void lowlevel_clock_init(void)
+{
+	struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
+
+	if (!(readl(&pmc->sr) & AT91_PMC_MOSCS)) {
+		/* Enable Main Oscillator */
+		writel(AT91_PMC_MOSCS | (0x40 << 8), &pmc->mor);
+
+		/* Wait until Main Oscillator is stable */
+		while (!(readl(&pmc->sr) & AT91_PMC_MOSCS))
+			;
+	}
+
+	/* After stabilization, switch to Main Oscillator */
+	if ((readl(&pmc->mckr) & AT91_PMC_CSS) == AT91_PMC_CSS_SLOW) {
+		unsigned long tmp;
+
+		tmp = readl(&pmc->mckr);
+		tmp &= ~AT91_PMC_CSS;
+		tmp |= AT91_PMC_CSS_MAIN;
+		writel(tmp, &pmc->mckr);
+		while (!(readl(&pmc->sr) & AT91_PMC_MCKRDY))
+			;
+
+		tmp &= ~AT91_PMC_PRES;
+		tmp |= AT91_PMC_PRES_1;
+		writel(tmp, &pmc->mckr);
+		while (!(readl(&pmc->sr) & AT91_PMC_MCKRDY))
+			;
+	}
+
+	return;
+}
+
+void __weak matrix_init(void)
+{
+}
+
+void __weak at91_spl_board_init(void)
+{
+}
+
+void __weak spl_board_init(void)
+{
+}
+
+void board_init_f(ulong dummy)
+{
+	lowlevel_clock_init();
+	at91_disable_wdt();
+
+	/*
+	 * At this stage the main oscillator is supposed to be enabled
+	 * PCK = MCK = MOSC
+	 */
+	at91_pllicpr_init(0x00);
+
+	/* Configure PLLA = MOSC * (PLL_MULA + 1) / PLL_DIVA */
+	at91_plla_init(CONFIG_SYS_AT91_PLLA);
+
+	/* PCK = PLLA = 2 * MCK */
+	at91_mck_init(CONFIG_SYS_MCKR);
+
+	/* Switch MCK on PLLA output */
+	at91_mck_init(CONFIG_SYS_MCKR_CSS);
+
+#if defined(CONFIG_SYS_AT91_PLLB)
+	/* Configure PLLB */
+	at91_pllb_init(CONFIG_SYS_AT91_PLLB);
+#endif
+
+	/* Enable External Reset */
+	enable_ext_reset();
+
+	/* Initialize matrix */
+	matrix_init();
+
+	gd->arch.mck_rate_hz = CONFIG_SYS_MASTER_CLOCK;
+	/*
+	 * init timer long enough for using in spl.
+	 */
+	timer_init();
+
+	/* enable clocks for all PIOs */
+#if defined(CONFIG_AT91SAM9X5) || defined(CONFIG_AT91SAM9N12)
+	at91_periph_clk_enable(ATMEL_ID_PIOAB);
+	at91_periph_clk_enable(ATMEL_ID_PIOCD);
+#else
+	at91_periph_clk_enable(ATMEL_ID_PIOA);
+	at91_periph_clk_enable(ATMEL_ID_PIOB);
+	at91_periph_clk_enable(ATMEL_ID_PIOC);
+#endif
+
+#if defined(CONFIG_SPL_SERIAL_SUPPORT)
+	/* init console */
+	at91_seriald_hw_init();
+	preloader_console_init();
+#endif
+
+	mem_init();
+
+	at91_spl_board_init();
+}