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/drivers/mmc/mmc_legacy.c

@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2016 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <mmc.h>
+
+static struct list_head mmc_devices;
+static int cur_dev_num = -1;
+
+struct mmc *find_mmc_device(int dev_num)
+{
+	struct mmc *m;
+	struct list_head *entry;
+
+	list_for_each(entry, &mmc_devices) {
+		m = list_entry(entry, struct mmc, link);
+
+		if (m->block_dev.devnum == dev_num)
+			return m;
+	}
+
+#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
+	printf("MMC Device %d not found\n", dev_num);
+#endif
+
+	return NULL;
+}
+
+int mmc_get_next_devnum(void)
+{
+	return cur_dev_num++;
+}
+
+struct blk_desc *mmc_get_blk_desc(struct mmc *mmc)
+{
+	return &mmc->block_dev;
+}
+
+int get_mmc_num(void)
+{
+	return cur_dev_num;
+}
+
+void mmc_do_preinit(void)
+{
+	struct mmc *m;
+	struct list_head *entry;
+
+	list_for_each(entry, &mmc_devices) {
+		m = list_entry(entry, struct mmc, link);
+
+#ifdef CONFIG_FSL_ESDHC_ADAPTER_IDENT
+		mmc_set_preinit(m, 1);
+#endif
+		if (m->preinit)
+			mmc_start_init(m);
+	}
+}
+
+void mmc_list_init(void)
+{
+	INIT_LIST_HEAD(&mmc_devices);
+	cur_dev_num = 0;
+}
+
+void mmc_list_add(struct mmc *mmc)
+{
+	INIT_LIST_HEAD(&mmc->link);
+
+	list_add_tail(&mmc->link, &mmc_devices);
+}
+
+#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
+void print_mmc_devices(char separator)
+{
+	struct mmc *m;
+	struct list_head *entry;
+	char *mmc_type;
+
+	list_for_each(entry, &mmc_devices) {
+		m = list_entry(entry, struct mmc, link);
+
+		if (m->has_init)
+			mmc_type = IS_SD(m) ? "SD" : "eMMC";
+		else
+			mmc_type = NULL;
+
+		printf("%s: %d", m->cfg->name, m->block_dev.devnum);
+		if (mmc_type)
+			printf(" (%s)", mmc_type);
+
+		if (entry->next != &mmc_devices) {
+			printf("%c", separator);
+			if (separator != '\n')
+				puts(" ");
+		}
+	}
+
+	printf("\n");
+}
+
+#else
+void print_mmc_devices(char separator) { }
+#endif