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/led/Kconfig

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+menu "LED Support"
+
+config LED
+	bool "Enable LED support"
+	depends on DM
+	help
+	  Many boards have LEDs which can be used to signal status or alerts.
+	  U-Boot provides a uclass API to implement this feature. LED drivers
+	  can provide access to board-specific LEDs. Use of the device tree
+	  for configuration is encouraged.
+
+config SPL_LED
+	bool "Enable LED support in SPL"
+	depends on SPL && SPL_DM
+	help
+	  The LED subsystem adds a small amount of overhead to the image.
+	  If this is acceptable and you have a need to use LEDs in SPL,
+	  enable this option. You will need to enable device tree in SPL
+	  for this to work.
+
+config LED_GPIO
+	bool "LED support for GPIO-connected LEDs"
+	depends on LED && DM_GPIO
+	help
+	  Enable support for LEDs which are connected to GPIO lines. These
+	  GPIOs may be on the SoC or some other device which provides GPIOs.
+	  The GPIO driver must used driver model. LEDs are configured using
+	  the device tree.
+
+config SPL_LED_GPIO
+	bool "LED support for GPIO-connected LEDs in SPL"
+        depends on SPL_LED && DM_GPIO
+	help
+	  This option is an SPL-variant of the LED_GPIO option.
+	  See the help of LED_GPIO for details.
+
+endmenu