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/tools/env/fw_env.h

@@ -0,0 +1,78 @@
+/*
+ * (C) Copyright 2002-2008
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <aes.h>
+#include <stdint.h>
+
+/* Pull in the current config to define the default environment */
+#include <linux/kconfig.h>
+
+#ifndef __ASSEMBLY__
+#define __ASSEMBLY__ /* get only #defines from config.h */
+#include <config.h>
+#undef	__ASSEMBLY__
+#else
+#include <config.h>
+#endif
+
+/*
+ * To build the utility with the static configuration
+ * comment out the next line.
+ * See included "fw_env.config" sample file
+ * for notes on configuration.
+ */
+#define CONFIG_FILE     "/etc/fw_env.config"
+
+#ifndef CONFIG_FILE
+#define HAVE_REDUND /* For systems with 2 env sectors */
+#define DEVICE1_NAME      "/dev/mtd1"
+#define DEVICE2_NAME      "/dev/mtd2"
+#define DEVICE1_OFFSET    0x0000
+#define ENV1_SIZE         0x4000
+#define DEVICE1_ESIZE     0x4000
+#define DEVICE1_ENVSECTORS     2
+#define DEVICE2_OFFSET    0x0000
+#define ENV2_SIZE         0x4000
+#define DEVICE2_ESIZE     0x4000
+#define DEVICE2_ENVSECTORS     2
+#endif
+
+#ifndef CONFIG_BAUDRATE
+#define CONFIG_BAUDRATE		115200
+#endif
+
+#ifndef CONFIG_BOOTDELAY
+#define CONFIG_BOOTDELAY	5	/* autoboot after 5 seconds	*/
+#endif
+
+#ifndef CONFIG_BOOTCOMMAND
+#define CONFIG_BOOTCOMMAND							\
+	"bootp; "								\
+	"setenv bootargs root=/dev/nfs nfsroot=${serverip}:${rootpath} "	\
+	"ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}::off; "	\
+	"bootm"
+#endif
+
+struct env_opts {
+#ifdef CONFIG_FILE
+	char *config_file;
+#endif
+	int aes_flag; /* Is AES encryption used? */
+	uint8_t aes_key[AES_KEY_LENGTH];
+};
+
+int parse_aes_key(char *key, uint8_t *bin_key);
+
+int fw_printenv(int argc, char *argv[], int value_only, struct env_opts *opts);
+char *fw_getenv(char *name);
+int fw_setenv(int argc, char *argv[], struct env_opts *opts);
+int fw_parse_script(char *fname, struct env_opts *opts);
+int fw_env_open(struct env_opts *opts);
+int fw_env_write(char *name, char *value);
+int fw_env_close(struct env_opts *opts);
+
+unsigned long crc32(unsigned long, const unsigned char *, unsigned);