ram: dm ramdisk: Select new ram partition driver

Add dm_ramdisk_is_enabled() for runtime judgement for
compatibility in some place.

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: I89

ram: dm ramdisk: Select new ram partition driver

Add dm_ramdisk_is_enabled() for runtime judgement for
compatibility in some place.

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: I898d91668a244dccab8132b3a32f737563458827

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dm: ramdisk: remove unused function

blk uclass would take over initialization.

Change-Id: I34bcb858520b06110685f643705da83c4640a094
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>

dm: blk: add ramdisk uclass support

- Use ram as a disk which appears as block devices.
- Provide a read only ramdisk driver.

Change-Id: Ie6dc1a036c8a2841cacd0d467599c11b74b4ad77
Signed-off-by: Jos

dm: blk: add ramdisk uclass support

- Use ram as a disk which appears as block devices.
- Provide a read only ramdisk driver.

Change-Id: Ie6dc1a036c8a2841cacd0d467599c11b74b4ad77
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>

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