1config BLK 2 bool "Support block devices" 3 depends on DM 4 default y if DM_MMC 5 help 6 Enable support for block devices, such as SCSI, MMC and USB 7 flash sticks. These provide a block-level interface which permits 8 reading, writing and (in some cases) erasing blocks. Block 9 devices often have a partition table which allows the device to 10 be partitioned into several areas, called 'partitions' in U-Boot. 11 A filesystem can be placed in each partition. 12 13config AHCI 14 bool "Support SATA controllers with driver model" 15 depends on DM 16 help 17 This enables a uclass for disk controllers in U-Boot. Various driver 18 types can use this, such as AHCI/SATA. It does not provide any standard 19 operations at present. The block device interface has not been converted 20 to driver model. 21 22config BLOCK_CACHE 23 bool "Use block device cache" 24 default n 25 help 26 This option enables a disk-block cache for all block devices. 27 This is most useful when accessing filesystems under U-Boot since 28 it will prevent repeated reads from directory structures and other 29 filesystem data structures. 30