u-boot/fs/btrfs/Kconfig

config FS_BTRFS
	bool "Enable BTRFS filesystem support"
	select CRC32C
	select LZO
	select RBTREE
	help
	  This provides a single-device read-only BTRFS support. BTRFS is a
	  next-generation Linux file system based on the copy-on-write
	  principle.