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 HAVE_BLOCK_DEVICE 14 bool "Enable Legacy Block Device" 15 help 16 Some devices require block support whether or not DM is enabled 17 18config SPL_BLK 19 bool "Support block devices in SPL" 20 depends on SPL_DM && BLK 21 default y 22 help 23 Enable support for block devices, such as SCSI, MMC and USB 24 flash sticks. These provide a block-level interface which permits 25 reading, writing and (in some cases) erasing blocks. Block 26 devices often have a partition table which allows the device to 27 be partitioned into several areas, called 'partitions' in U-Boot. 28 A filesystem can be placed in each partition. 29 30config TPL_BLK 31 bool "Support block devices in TPL" 32 depends on TPL_DM && BLK 33 default y 34 help 35 Enable support for block devices, such as SCSI, MMC and USB 36 flash sticks. These provide a block-level interface which permits 37 reading, writing and (in some cases) erasing blocks. Block 38 devices often have a partition table which allows the device to 39 be partitioned into several areas, called 'partitions' in U-Boot. 40 A filesystem can be placed in each partition. 41 42config BLOCK_CACHE 43 bool "Use block device cache" 44 depends on BLK 45 default y 46 help 47 This option enables a disk-block cache for all block devices. 48 This is most useful when accessing filesystems under U-Boot since 49 it will prevent repeated reads from directory structures and other 50 filesystem data structures. 51 52config SPL_BLOCK_CACHE 53 bool "Use block device cache in SPL" 54 depends on SPL_BLK 55 default n 56 help 57 This option enables the disk-block cache in SPL 58 59config IDE 60 bool "Support IDE controllers" 61 select HAVE_BLOCK_DEVICE 62 help 63 Enables support for IDE (Integrated Drive Electronics) hard drives. 64 This allows access to raw blocks and filesystems on an IDE drive 65 from U-Boot. See also CMD_IDE which provides an 'ide' command for 66 performing various IDE operations. 67