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/block/Kconfig

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+config BLK
+	bool "Support block devices"
+	depends on DM
+	help
+	  Enable support for block devices, such as SCSI, MMC and USB
+	  flash sticks. These provide a block-level interface which permits
+	  reading, writing and (in some cases) erasing blocks. Block
+	  devices often have a partition table which allows the device to
+	  be partitioned into several areas, called 'partitions' in U-Boot.
+	  A filesystem can be placed in each partition.
+
+config AHCI
+	bool "Support SATA controllers with driver model"
+	depends on DM
+	help
+	  This enables a uclass for disk controllers in U-Boot. Various driver
+	  types can use this, such as AHCI/SATA. It does not provide any standard
+	  operations at present. The block device interface has not been converted
+	  to driver model.
+
+config BLOCK_CACHE
+	bool "Use block device cache"
+	default n
+	help
+	  This option enables a disk-block cache for all block devices.
+	  This is most useful when accessing filesystems under U-Boot since
+	  it will prevent repeated reads from directory structures and other
+	  filesystem data structures.