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 SPL_BLK 14 bool "Support block devices in SPL" 15 depends on SPL_DM && BLK 16 default y 17 help 18 Enable support for block devices, such as SCSI, MMC and USB 19 flash sticks. These provide a block-level interface which permits 20 reading, writing and (in some cases) erasing blocks. Block 21 devices often have a partition table which allows the device to 22 be partitioned into several areas, called 'partitions' in U-Boot. 23 A filesystem can be placed in each partition. 24 25config BLOCK_CACHE 26 bool "Use block device cache" 27 default n 28 help 29 This option enables a disk-block cache for all block devices. 30 This is most useful when accessing filesystems under U-Boot since 31 it will prevent repeated reads from directory structures and other 32 filesystem data structures. 33 34config IDE 35 bool "Support IDE controllers" 36 help 37 Enables support for IDE (Integrated Drive Electronics) hard drives. 38 This allows access to raw blocks and filesystems on an IDE drive 39 from U-Boot. See also CMD_IDE which provides an 'ide' command for 40 performing various IDE operations. 41