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/bct-brettl2/bct-brettl2.c

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+/*
+ * U-Boot - main board file for BCT brettl2
+ *
+ * Copyright (c) 2010 BCT Electronic GmbH
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+#include <config.h>
+#include <command.h>
+#include <asm/blackfin.h>
+#include <asm/portmux.h>
+#include <asm/gpio.h>
+#include <net.h>
+#include <netdev.h>
+#include <miiphy.h>
+
+#include "../cm-bf537e/gpio_cfi_flash.h"
+#include "smsc9303.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int checkboard(void)
+{
+	printf("Board: bct-brettl2 board\n");
+	printf("       Support: http://www.bct-electronic.com/\n");
+	return 0;
+}
+
+#ifdef CONFIG_BFIN_MAC
+int board_eth_init(bd_t *bis)
+{
+	int retry = 3;
+	int ret;
+
+	ret = bfin_EMAC_initialize(bis);
+
+	uchar enetaddr[6];
+	if (eth_getenv_enetaddr("ethaddr", enetaddr)) {
+		printf("setting MAC %pM\n", enetaddr);
+	}
+	puts("       ");
+
+	puts("initialize SMSC LAN9303i ethernet switch\n");
+
+	while (retry-- > 0) {
+		if (init_smsc9303i_mii())
+			return ret;
+	}
+
+	return ret;
+}
+#endif
+
+static void init_tlv320aic31(void)
+{
+	puts("Audio: setup TIMER0 to enable 16.384 MHz clock for tlv320aic31\n");
+	peripheral_request(P_TMR0, "tlv320aic31 clock");
+	bfin_write_TIMER0_CONFIG(0x020d);
+	bfin_write_TIMER0_PERIOD(0x0008);
+	bfin_write_TIMER0_WIDTH(0x0008/2);
+	bfin_write_TIMER_ENABLE(bfin_read_TIMER_ENABLE() | 1);
+	SSYNC();
+	udelay(10000);
+
+	puts("       resetting tlv320aic31\n");
+
+	gpio_request(GPIO_PF2, "tlv320aic31");
+	gpio_direction_output(GPIO_PF2, 0);
+	udelay(10000);
+	gpio_direction_output(GPIO_PF2, 1);
+	udelay(10000);
+	gpio_free(GPIO_PF2);
+}
+
+static void init_mute_pin(void)
+{
+	printf("       unmute class D amplifier\n");
+
+	gpio_request(GPIO_PF5, "mute");
+	gpio_direction_output(GPIO_PF5, 1);
+	gpio_free(GPIO_PF5);
+}
+
+/* sometimes LEDs (speech, status) are still on after reboot, turn 'em off */
+static void turn_leds_off(void)
+{
+	printf("       turn LEDs off\n");
+
+	gpio_request(GPIO_PF6, "led");
+	gpio_direction_output(GPIO_PF6, 0);
+	gpio_free(GPIO_PF6);
+
+	gpio_request(GPIO_PF15, "led");
+	gpio_direction_output(GPIO_PF15, 0);
+	gpio_free(GPIO_PF15);
+}
+
+/* miscellaneous platform dependent initialisations */
+int misc_init_r(void)
+{
+	gpio_cfi_flash_init();
+	init_tlv320aic31();
+	init_mute_pin();
+	turn_leds_off();
+
+	return 0;
+}