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fs/cramfs: add xip option

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Cramfs now has the ability to XIP all ELF files.

Cc: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Chris Brandt 2018-04-07 08:35:43 -05:00 committed by Thomas Petazzoni
parent 2cf4871808
commit 265aee8c51
2 changed files with 28 additions and 0 deletions
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20
fs/cramfs/Config.in
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@ -4,3 +4,23 @@ config BR2_TARGET_ROOTFS_CRAMFS
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

8
fs/cramfs/cramfs.mk
View File

@ -10,6 +10,14 @@ else
CRAMFS_OPTS = -L
endif
ifeq ($(BR2_TARGET_ROOTFS_CRAMFS_XIP),y)
ifeq ($(BR2_USE_MMU),y)
CRAMFS_OPTS += -X -X
else
CRAMFS_OPTS += -X
endif
endif
define ROOTFS_CRAMFS_CMD
$(HOST_DIR)/bin/mkcramfs $(CRAMFS_OPTS) $(TARGET_DIR) $@
endef