Create a new boot/ directory

Quite a lot of the code in common/relates to booting and images. Before
adding more it seems like a good time to move the code into its own
directory.

Most files with 'boot' or 'image' in them are moved, except:

- autoboot.c which relates to U-Boot automatically running a script
- bootstage.c which relates to U-Boot timing

Drop the removal of boot* files from the output directory, since this
interfers with the symlinks created by tools and there does not appear
to be any such file from my brief testing.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Artem Lapkin <email2tema@gmail.com>
Tested-by: Artem Lapkin <email2tema@gmail.com>

boot/common_fit.c

@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2016 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <image.h>
+#include <log.h>
+#include <linux/libfdt.h>
+
+ulong fdt_getprop_u32(const void *fdt, int node, const char *prop)
+{
+	const u32 *cell;
+	int len;
+
+	cell = fdt_getprop(fdt, node, prop, &len);
+	if (!cell || len != sizeof(*cell))
+		return FDT_ERROR;
+
+	return fdt32_to_cpu(*cell);
+}
+
+__weak int board_fit_config_name_match(const char *name)
+{
+	return -EINVAL;
+}
+
+/*
+ * Iterate over all /configurations subnodes and call a platform specific
+ * function to find the matching configuration.
+ * Returns the node offset or a negative error number.
+ */
+int fit_find_config_node(const void *fdt)
+{
+	const char *name;
+	int conf, node, len;
+	const char *dflt_conf_name;
+	const char *dflt_conf_desc = NULL;
+	int dflt_conf_node = -ENOENT;
+
+	conf = fdt_path_offset(fdt, FIT_CONFS_PATH);
+	if (conf < 0) {
+		debug("%s: Cannot find /configurations node: %d\n", __func__,
+		      conf);
+		return -EINVAL;
+	}
+
+	dflt_conf_name = fdt_getprop(fdt, conf, "default", &len);
+
+	for (node = fdt_first_subnode(fdt, conf);
+	     node >= 0;
+	     node = fdt_next_subnode(fdt, node)) {
+		name = fdt_getprop(fdt, node, "description", &len);
+		if (!name) {
+#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
+			printf("%s: Missing FDT description in DTB\n",
+			       __func__);
+#endif
+			return -EINVAL;
+		}
+
+		if (dflt_conf_name) {
+			const char *node_name = fdt_get_name(fdt, node, NULL);
+			if (strcmp(dflt_conf_name, node_name) == 0) {
+				dflt_conf_node = node;
+				dflt_conf_desc = name;
+			}
+		}
+
+		if (board_fit_config_name_match(name))
+			continue;
+
+		debug("Selecting config '%s'\n", name);
+
+		return node;
+	}
+
+	if (dflt_conf_node != -ENOENT) {
+		debug("Selecting default config '%s'\n", dflt_conf_desc);
+		return dflt_conf_node;
+	}
+
+	return -ENOENT;
+}