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initramfs: fix boot with dynamic /dev

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Devtmpfs (which is used by devtmpfs/mdev/udev options) doesn't get
automounted by the kernel when an initramfs is used, causing boot
failures when a dynamic /dev is used.

Fix it by adding a pre-init script to mount devtmpfs before running init.

Reported-by: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Peter Korsgaard 2011-07-20 16:30:14 +02:00
parent 8a6f23a424
commit 424888e474
2 changed files with 19 additions and 2 deletions
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4
fs/initramfs/init Executable file
View File

@ -0,0 +1,4 @@
#!/bin/sh
# devtmpfs does not get automounted for initramfs
/bin/mount -t devtmpfs devtmpfs /dev
exec /sbin/init $*

17
fs/initramfs/initramfs.mk
View File

@ -6,13 +6,26 @@
#
#############################################################
define ROOTFS_INITRAMFS_INIT_SYMLINK
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
ROOTFS_INITRAMFS_PRE_GEN_HOOKS += ROOTFS_INITRAMFS_INIT_SYMLINK
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) > $$@