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/i2c/muxes/Kconfig

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+config I2C_MUX
+	bool "Support I2C multiplexers"
+	depends on DM_I2C
+	help
+	  This enables I2C buses to be multiplexed, so that you can select
+	  one of several buses using some sort of control mechanism. The
+	  bus select is handled automatically when that bus is accessed,
+	  using a suitable I2C MUX driver.
+
+config SPL_I2C_MUX
+	bool "Support I2C multiplexers on SPL"
+	depends on I2C_MUX
+	help
+	  This enables I2C buses to be multiplexed, so that you can select
+	  one of several buses using some sort of control mechanism. The
+	  bus select is handled automatically when that bus is accessed,
+	  using a suitable I2C MUX driver.
+
+config I2C_ARB_GPIO_CHALLENGE
+	bool "GPIO-based I2C arbitration"
+	depends on I2C_MUX
+	help
+	  If you say yes to this option, support will be included for an
+	  I2C multimaster arbitration scheme using GPIOs and a challenge &
+	  response mechanism where masters have to claim the bus by asserting
+	  a GPIO.
+
+config I2C_MUX_PCA954x
+	tristate "TI PCA954x I2C Mux/switches"
+	depends on I2C_MUX
+	help
+	  If you say yes here you get support for the TI PCA954x
+	  I2C mux/switch devices. It is x width I2C multiplexer which enables to
+	  paritioning I2C bus and connect multiple devices with the same address
+	  to the same I2C controller where driver handles proper routing to
+	  target i2c device. PCA9544 and PCA9548 are supported.