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/include/zfs/dsl_dir.h

@@ -0,0 +1,37 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_SYS_DSL_DIR_H
+#define	_SYS_DSL_DIR_H
+
+typedef struct dsl_dir_phys {
+	uint64_t dd_creation_time; /* not actually used */
+	uint64_t dd_head_dataset_obj;
+	uint64_t dd_parent_obj;
+	uint64_t dd_clone_parent_obj;
+	uint64_t dd_child_dir_zapobj;
+	/*
+	 * how much space our children are accounting for; for leaf
+	 * datasets, == physical space used by fs + snaps
+	 */
+	uint64_t dd_used_bytes;
+	uint64_t dd_compressed_bytes;
+	uint64_t dd_uncompressed_bytes;
+	/* Administrative quota setting */
+	uint64_t dd_quota;
+	/* Administrative reservation setting */
+	uint64_t dd_reserved;
+	uint64_t dd_props_zapobj;
+	uint64_t dd_deleg_zapobj;	/* dataset permissions */
+	uint64_t dd_pad[20]; /* pad out to 256 bytes for good measure */
+} dsl_dir_phys_t;
+
+#endif /* _SYS_DSL_DIR_H */