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Create menu entry to select device creation method

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Four methods for the creation of device files in /dev are now
proposed:

 - static method uses device table as before
 - devtmpfs method enables this feature in kernel
 - mdev method adds mdev starting script to the file system
    and selects mdev itself for installation
 - udev method selects udev for installation

All dynamic methods are based on devtmpfs, so one doesn't need to care
about /dev folder.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Yegor Yefremov 2010-09-30 14:57:53 +02:00 committed by Peter Korsgaard
parent c59d024754
commit 726b15f64a
4 changed files with 69 additions and 6 deletions
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33
fs/Config.in
View File

@ -15,13 +15,34 @@ config BR2_ROOTFS_POST_BUILD_SCRIPT
only argument. Make sure the exit code of that script is 0,
otherwise make will stop after calling it.
choice
prompt "/dev management"
default BR2_ROOTFS_DEVICE_CREATION_STATIC
config BR2_ROOTFS_DEVICE_CREATION_STATIC
bool "Static using device table"
config BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_DEVTMPFS
bool "Dynamic using devtmpfs only"
config BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV
bool "Dynamic using mdev"
select BR2_PACKAGE_BUSYBOX
config BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_UDEV
bool "Dynamic using udev"
select BR2_PACKAGE_UDEV
endchoice
config BR2_ROOTFS_DEVICE_TABLE
string "Path to the device table"
default "target/generic/device_table.txt"
help
Specify the location of a device table, that will be passed
to the makedevs utility to create all the special device
files in the target filesystem.
string "Path to the device table"
depends on BR2_ROOTFS_DEVICE_CREATION_STATIC
default "target/generic/device_table.txt"
help
Specify the location of a device table, that will be passed
to the makedevs utility to create all the special device
files in the target filesystem.
choice
prompt "Root FS skeleton"

7
linux/linux.mk
View File

@ -133,6 +133,13 @@ ifeq ($(BR2_TARGET_ROOTFS_INITRAMFS),y)
$(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0,$(@D)/.config)
$(call KCONFIG_DISABLE_OPT,CONFIG_INITRAMFS_COMPRESSION_NONE,$(@D)/.config)
$(call KCONFIG_ENABLE_OPT,CONFIG_INITRAMFS_COMPRESSION_GZIP,$(@D)/.config)
endif
ifneq ($(BR2_ROOTFS_DEVICE_CREATION_STATIC),y)
$(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS,$(@D)/.config)
$(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT,$(@D)/.config)
endif
ifeq ($(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV),y)
$(call KCONFIG_SET_OPT,CONFIG_UEVENT_HELPER_PATH,\"/sbin/mdev\",$(@D)/.config)
endif
$(TARGET_MAKE_ENV) $(MAKE) $(LINUX26_MAKE_FLAGS) -C $(@D) oldconfig
$(Q)touch $@

20
package/busybox/S10mdev Normal file
View File

@ -0,0 +1,20 @@
#!/bin/sh
#
# Start mdev....
#
case "$1" in
start)
echo "Starting mdev..."
/sbin/mdev -s
;;
stop)
;;
restart|reload)
;;
*)
echo $"Usage: $0 {start|stop|restart}"
exit 1
esac
exit $?

15
package/busybox/busybox.mk
View File

@ -28,6 +28,19 @@ ifndef BUSYBOX_CONFIG_FILE
BUSYBOX_CONFIG_FILE = $(call qstrip,$(BR2_PACKAGE_BUSYBOX_CONFIG))
endif
# If mdev will be used for device creation enable it and copy S10mdev to /etc/init.d
ifeq ($(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV),y)
define BUSYBOX_INSTALL_MDEV_SCRIPT
install -m 0755 package/busybox/S10mdev $(TARGET_DIR)/etc/init.d
endef
define BUSYBOX_SET_MDEV
$(call KCONFIG_ENABLE_OPT,CONFIG_MDEV,$(BUSYBOX_BUILD_CONFIG))
$(call KCONFIG_ENABLE_OPT,CONFIG_FEATURE_MDEV_CONF,$(BUSYBOX_BUILD_CONFIG))
$(call KCONFIG_ENABLE_OPT,CONFIG_FEATURE_MDEV_EXEC,$(BUSYBOX_BUILD_CONFIG))
$(call KCONFIG_ENABLE_OPT,CONFIG_FEATURE_MDEV_LOAD_FIRMWARE,$(BUSYBOX_BUILD_CONFIG))
endef
endif
# If we have external syslogd, force busybox to use it
ifeq ($(BR2_PACKAGE_SYSKLOGD),y)
define BUSYBOX_SET_SYSKLOGD
@ -122,6 +135,7 @@ define BUSYBOX_CONFIGURE_CMDS
$(BUSYBOX_SET_IPV6)
$(BUSYBOX_SET_RPC)
$(BUSYBOX_PREFER_STATIC)
$(BUSYBOX_SET_MDEV)
$(BUSYBOX_NETKITBASE)
$(BUSYBOX_NETKITTELNET)
@yes "" | $(MAKE) ARCH=$(KERNEL_ARCH) CROSS_COMPILE="$(TARGET_CROSS)" \
@ -138,6 +152,7 @@ define BUSYBOX_INSTALL_TARGET_CMDS
$(INSTALL) -m 0755 -D package/busybox/udhcpc.script \
$(TARGET_DIR)/usr/share/udhcpc/default.script; \
fi
$(BUSYBOX_INSTALL_MDEV_SCRIPT)
endef
define BUSYBOX_UNINSTALL_TARGET_CMDS