buildroot/fs/cramfs/Config.in

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config BR2_TARGET_ROOTFS_CRAMFS
bool "cramfs root filesystem"
help
Build a cramfs root filesystem
https://github.com/npitre/cramfs-tools
if BR2_TARGET_ROOTFS_CRAMFS
config BR2_TARGET_ROOTFS_CRAMFS_XIP
bool "Support XIP of all ELF files"
help
For ELF files, uncompressed and properly aligned data blocks
will be automatically be mapped directly into user space
whenever possible providing eXecute-In-Place (XIP) from ROM
of read-only segments. Data segments mapped read-write
(hence they have to be copied to RAM) may still be
compressed in the cramfs image in the same file along with
non compressed read-only segments. Both MMU and no-MMU
systems are supported. This is particularly handy for tiny
embedded systems with very tight memory constraints.
The CRAMFS_MTD Kconfig option must also be enabled in a
4.15+ kernel.
endif # BR2_TARGET_ROOTFS_CRAMFS