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/Kconfig

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+#
+# For a description of the syntax of this configuration file,
+# see the file Documentation/kbuild/kconfig-language.txt in the
+# Linux kernel source tree.
+#
+mainmenu "U-Boot $UBOOTVERSION Configuration"
+
+config UBOOTVERSION
+	string
+	option env="UBOOTVERSION"
+
+# Allow defaults in arch-specific code to override any given here
+source "arch/Kconfig"
+
+menu "General setup"
+
+config LOCALVERSION
+	string "Local version - append to U-Boot release"
+	help
+	  Append an extra string to the end of your U-Boot version.
+	  This will show up in your boot log, for example.
+	  The string you set here will be appended after the contents of
+	  any files with a filename matching localversion* in your
+	  object and source tree, in that order.  Your total string can
+	  be a maximum of 64 characters.
+
+config LOCALVERSION_AUTO
+	bool "Automatically append version information to the version string"
+	default y
+	help
+	  This will try to automatically determine if the current tree is a
+	  release tree by looking for Git tags that belong to the current
+	  top of tree revision.
+
+	  A string of the format -gxxxxxxxx will be added to the localversion
+	  if a Git-based tree is found.  The string generated by this will be
+	  appended after any matching localversion* files, and after the value
+	  set in CONFIG_LOCALVERSION.
+
+	  (The actual string used here is the first eight characters produced
+	  by running the command:
+
+	    $ git rev-parse --verify HEAD
+
+	  which is done within the script "scripts/setlocalversion".)
+
+config CC_OPTIMIZE_FOR_SIZE
+	bool "Optimize for size"
+	default y
+	help
+	  Enabling this option will pass "-Os" instead of "-O2" to gcc
+	  resulting in a smaller U-Boot image.
+
+	  This option is enabled by default for U-Boot.
+
+config DISTRO_DEFAULTS
+	bool "Select defaults suitable for booting general purpose Linux distributions"
+	default y if ARCH_SUNXI
+	default n
+	select CMD_BOOTZ
+	select CMD_DHCP
+	select CMD_EXT2
+	select CMD_EXT4
+	select CMD_FAT
+	select CMD_FS_GENERIC
+	select CMD_MII
+	select CMD_PING
+	select HUSH_PARSER
+	help
+	  Select this to enable various options and commands which are suitable
+	  for building u-boot for booting general purpose Linux distributions.
+
+config SYS_MALLOC_F
+	bool "Enable malloc() pool before relocation"
+	default y if DM
+	help
+	  Before relocation, memory is very limited on many platforms. Still,
+	  we can provide a small malloc() pool if needed. Driver model in
+	  particular needs this to operate, so that it can allocate the
+	  initial serial device and any others that are needed.
+
+config SYS_MALLOC_F_LEN
+	hex "Size of malloc() pool before relocation"
+	depends on SYS_MALLOC_F
+	default 0x400
+	help
+	  Before relocation, memory is very limited on many platforms. Still,
+	  we can provide a small malloc() pool if needed. Driver model in
+	  particular needs this to operate, so that it can allocate the
+	  initial serial device and any others that are needed.
+
+menuconfig EXPERT
+	bool "Configure standard U-Boot features (expert users)"
+	default y
+	help
+	  This option allows certain base U-Boot options and settings
+	  to be disabled or tweaked. This is for specialized
+	  environments which can tolerate a "non-standard" U-Boot.
+	  Use this only if you really know what you are doing.
+
+if EXPERT
+	config SYS_MALLOC_CLEAR_ON_INIT
+	bool "Init with zeros the memory reserved for malloc (slow)"
+	default y
+	help
+	  This setting is enabled by default. The reserved malloc
+	  memory is initialized with zeros, so first malloc calls
+	  will return the pointer to the zeroed memory. But this
+	  slows the boot time.
+
+	  It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
+	  value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
+	  Then the boot time can be significantly reduced.
+	  Warning:
+	  When disabling this, please check if malloc calls, maybe
+	  should be replaced by calloc - if one expects zeroed memory.
+endif
+endmenu		# General setup
+
+menu "Boot images"
+
+config SUPPORT_SPL
+	bool
+
+config SUPPORT_TPL
+	bool
+
+config SPL
+	bool
+	depends on SUPPORT_SPL
+	prompt "Enable SPL"
+	help
+	  If you want to build SPL as well as the normal image, say Y.
+
+config SPL_SYS_MALLOC_SIMPLE
+	bool
+	depends on SPL
+	prompt "Only use malloc_simple functions in the SPL"
+	help
+	  Say Y here to only use the *_simple malloc functions from
+	  malloc_simple.c, rather then using the versions from dlmalloc.c;
+	  this will make the SPL binary smaller at the cost of more heap
+	  usage as the *_simple malloc functions do not re-use free-ed mem.
+
+config SPL_STACK_R
+	depends on SPL
+	bool "Enable SDRAM location for SPL stack"
+	help
+	  SPL starts off execution in SRAM and thus typically has only a small
+	  stack available. Since SPL sets up DRAM while in its board_init_f()
+	  function, it is possible for the stack to move there before
+	  board_init_r() is reached. This option enables a special SDRAM
+	  location for the SPL stack. U-Boot SPL switches to this after
+	  board_init_f() completes, and before board_init_r() starts.
+
+config SPL_STACK_R_ADDR
+	depends on SPL_STACK_R
+	hex "SDRAM location for SPL stack"
+	help
+	  Specify the address in SDRAM for the SPL stack. This will be set up
+	  before board_init_r() is called.
+
+config SPL_STACK_R_MALLOC_SIMPLE_LEN
+	depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
+	hex "Size of malloc_simple heap after switching to DRAM SPL stack"
+	default 0x100000
+	help
+	  Specify the amount of the stack to use as memory pool for
+	  malloc_simple after switching the stack to DRAM. This may be set
+	  to give board_init_r() a larger heap then the initial heap in
+	  SRAM which is limited to SYS_MALLOC_F_LEN bytes.
+
+config SPL_SEPARATE_BSS
+	depends on SPL
+	bool "BSS section is in a different memory region from text"
+	help
+	  Some platforms need a large BSS region in SPL and can provide this
+	  because RAM is already set up. In this case BSS can be moved to RAM.
+	  This option should then be enabled so that the correct device tree
+	  location is used. Normally we put the device tree at the end of BSS
+	  but with this option enabled, it goes at _image_binary_end.
+
+config TPL
+	bool
+	depends on SPL && SUPPORT_TPL
+	prompt "Enable TPL"
+	help
+	  If you want to build TPL as well as the normal image and SPL, say Y.
+
+config FIT
+	bool "Support Flattened Image Tree"
+	help
+	  This option allows to boot the new uImage structrure,
+	  Flattened Image Tree.  FIT is formally a FDT, which can include
+	  images of various types (kernel, FDT blob, ramdisk, etc.)
+	  in a single blob.  To boot this new uImage structure,
+	  pass the address of the blob to the "bootm" command.
+	  FIT is very flexible, supporting compression, multiple images,
+	  multiple configurations, verification through hashing and also
+	  verified boot (secure boot using RSA). This option enables that
+	  feature.
+
+config SPL_FIT
+	bool "Support Flattened Image Tree within SPL"
+	depends on FIT
+	depends on SPL
+
+config FIT_VERBOSE
+	bool "Display verbose messages on FIT boot"
+	depends on FIT
+
+config FIT_SIGNATURE
+	bool "Enable signature verification of FIT uImages"
+	depends on FIT
+	depends on DM
+	select RSA
+	help
+	  This option enables signature verification of FIT uImages,
+	  using a hash signed and verified using RSA. If
+	  CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
+	  hashing is available using hardware, then then RSA library will use
+	  it. See doc/uImage.FIT/signature.txt for more details.
+
+	  WARNING: When relying on signed FIT images with a required signature
+	  check the legacy image format is disabled by default, so that
+	  unsigned images cannot be loaded. If a board needs the legacy image
+	  format support in this case, enable it using
+	  CONFIG_IMAGE_FORMAT_LEGACY.
+
+config SPL_FIT_SIGNATURE
+	bool "Enable signature verification of FIT firmware within SPL"
+	depends on SPL_FIT
+	depends on SPL_DM
+	select SPL_RSA
+
+config FIT_BEST_MATCH
+	bool "Select the best match for the kernel device tree"
+	depends on FIT
+	help
+	  When no configuration is explicitly selected, default to the
+	  one whose fdt's compatibility field best matches that of
+	  U-Boot itself. A match is considered "best" if it matches the
+	  most specific compatibility entry of U-Boot's fdt's root node.
+	  The order of entries in the configuration's fdt is ignored.
+
+config FIT_VERBOSE
+	bool "Show verbose messages when FIT images fails"
+	depends on FIT
+	help
+	  Generally a system will have valid FIT images so debug messages
+	  are a waste of code space. If you are debugging your images then
+	  you can enable this option to get more verbose information about
+	  failures.
+
+config OF_BOARD_SETUP
+	bool "Set up board-specific details in device tree before boot"
+	depends on OF_LIBFDT
+	help
+	  This causes U-Boot to call ft_board_setup() before booting into
+	  the Operating System. This function can set up various
+	  board-specific information in the device tree for use by the OS.
+	  The device tree is then passed to the OS.
+
+config OF_SYSTEM_SETUP
+	bool "Set up system-specific details in device tree before boot"
+	depends on OF_LIBFDT
+	help
+	  This causes U-Boot to call ft_system_setup() before booting into
+	  the Operating System. This function can set up various
+	  system-specific information in the device tree for use by the OS.
+	  The device tree is then passed to the OS.
+
+config OF_STDOUT_VIA_ALIAS
+	bool "Update the device-tree stdout alias from U-Boot"
+	depends on OF_LIBFDT
+	help
+	  This uses U-Boot's serial alias from the aliases node to update
+	  the device tree passed to the OS. The "linux,stdout-path" property
+	  in the chosen node is set to point to the correct serial node.
+	  This option currently references CONFIG_CONS_INDEX, which is
+	  incorrect when used with device tree as this option does not
+	  exist / should not be used.
+
+config SYS_EXTRA_OPTIONS
+	string "Extra Options (DEPRECATED)"
+	help
+	  The old configuration infrastructure (= mkconfig + boards.cfg)
+	  provided the extra options field. If you have something like
+	  "HAS_BAR,BAZ=64", the optional options
+	    #define CONFIG_HAS
+	    #define CONFIG_BAZ	64
+	  will be defined in include/config.h.
+	  This option was prepared for the smooth migration from the old
+	  configuration to Kconfig. Since this option will be removed sometime,
+	  new boards should not use this option.
+
+config SYS_TEXT_BASE
+	depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
+		(M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS
+	depends on !EFI_APP
+	hex "Text Base"
+	help
+	  TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
+
+config SPL_LOAD_FIT
+	bool "Enable SPL loading U-Boot as a FIT"
+	depends on FIT
+	help
+	  Normally with the SPL framework a legacy image is generated as part
+	  of the build. This contains U-Boot along with information as to
+	  where it should be loaded. This option instead enables generation
+	  of a FIT (Flat Image Tree) which provides more flexibility. In
+	  particular it can handle selecting from multiple device tree
+	  and passing the correct one to U-Boot.
+
+config SYS_CLK_FREQ
+	depends on ARC || ARCH_SUNXI
+	int "CPU clock frequency"
+	help
+	  TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
+
+endmenu		# Boot images
+
+source "common/Kconfig"
+
+source "cmd/Kconfig"
+
+source "dts/Kconfig"
+
+source "net/Kconfig"
+
+source "drivers/Kconfig"
+
+source "fs/Kconfig"
+
+source "lib/Kconfig"
+
+source "test/Kconfig"