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fs/initramfs: refactor with fs/cpio

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An initramfs is in fact the same as a cpio archive, but embedded in
the kernel.  So instead of duplicating the cpio infrastructure,
we can simply build images/rootfs.cpio and link that into the
kernel.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Arnout Vandecappelle (Essensium/Mind)
2011-09-06 23:16:09 +02:00
committed by Peter Korsgaard
parent 3fac21ef8d
commit 13a3afc536
5 changed files with 29 additions and 254 deletions
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43
fs/initramfs/initramfs.mk
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@@ -1,36 +1,23 @@
#############################################################
#
# Make a initramfs_list file to be used by gen_init_cpio
# gen_init_cpio is part of the 2.6 linux kernels to build an
# initial ramdisk filesystem based on cpio
# Build a kernel with an integrated initial ramdisk
# filesystem based on cpio.
#
#############################################################
ifeq ($(BR2_ROOTFS_DEVICE_CREATION_STATIC),y)
define ROOTFS_INITRAMFS_ADD_INIT
if [ ! -e $(TARGET_DIR)/init ]; then \
ln -sf sbin/init $(TARGET_DIR)/init; \
fi
endef
else
# devtmpfs does not get automounted when initramfs is used.
# Add a pre-init script to mount it before running init
define ROOTFS_INITRAMFS_ADD_INIT
if [ ! -e $(TARGET_DIR)/init ]; then \
$(INSTALL) -m 0755 fs/initramfs/init $(TARGET_DIR)/init; \
fi
endef
endif # BR2_ROOTFS_DEVICE_CREATION_STATIC
ROOTFS_INITRAMFS_PRE_GEN_HOOKS += ROOTFS_INITRAMFS_ADD_INIT
define ROOTFS_INITRAMFS_CMD
$(SHELL) fs/initramfs/gen_initramfs_list.sh -u 0 -g 0 $(TARGET_DIR) > $$@
endef
ROOTFS_INITRAMFS_DEPENDENCIES += rootfs-cpio
ROOTFS_INITRAMFS_POST_TARGETS += linux26-rebuild-with-initramfs
$(eval $(call ROOTFS_TARGET,initramfs))
# The generic fs infrastructure isn't very useful here.
rootfs-initramfs: $(ROOTFS_INITRAMFS_DEPENDENCIES) $(ROOTFS_INITRAMFS_POST_TARGETS)
rootfs-initramfs-show-depends:
@echo $(ROOTFS_INITRAMFS_DEPENDENCIES)
ifeq ($(BR2_TARGET_ROOTFS_INITRAMFS),y)
TARGETS += rootfs-initramfs
endif