From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yegor Yefremov Date: Fri, 08 Apr 2011 11:47:00 +0200 Subject: [Buildroot] [PATCH 1/3 v2] Create menu entry to select device creation method Message-ID: <4D9ED994.4010301@visionsystems.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net Hello Thomas and Yann, I've added a detailed help for device creation options. With the matter being described I think we can leave mdev starting script and kernel side mdev hotplugging activation as is. Best regards, Yegor -------------------------------------------------- From: Yegor Yefremov 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 Signed-off-by: Thomas Petazzoni --- fs/Config.in | 33 +++++++++++++++++++++++++++------ linux/linux.mk | 7 +++++++ package/busybox/S10mdev | 22 ++++++++++++++++++++++ package/busybox/busybox.mk | 15 +++++++++++++++ 4 files changed, 71 insertions(+), 6 deletions(-) create mode 100644 package/busybox/S10mdev Index: b/fs/Config.in =================================================================== --- a/fs/Config.in 2011-04-08 10:51:42.000000000 +0200 +++ b/fs/Config.in 2011-04-08 11:40:52.000000000 +0200 @@ -15,13 +15,53 @@ 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" + help + Use a device table, that will be passed to the makedevs utility + to create all the special device files in the target filesystem. + +config BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_DEVTMPFS + bool "Dynamic using devtmpfs only" + help + Enable CONFIG_DEVTMPFS and CONFIG_DEVTMPFS_MOUNT kernel options + to create and mount /dev before userspace starts. All registered + devices will occur in /dev directory. + +config BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV + bool "Dynamic using mdev" + select BR2_PACKAGE_BUSYBOX + help + Use mdev to populate /dev directory and load firmware. + For the latter special kernel option CONFIG_UEVENT_HELPER_PATH + will be set to mdev. + + CONFIG_DEVTMPFS and CONFIG_DEVTMPFS_MOUNT kernel options will be + also enabled to dynamically create and mount /dev directory. + +config BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_UDEV + bool "Dynamic using udev" + select BR2_PACKAGE_UDEV + help + Use udev to populate /dev directory and load firmware. + + CONFIG_DEVTMPFS and CONFIG_DEVTMPFS_MOUNT kernel options will be + also enabled to dynamically create and mount /dev directory. + +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" Index: b/linux/linux.mk =================================================================== --- a/linux/linux.mk 2011-04-08 10:51:42.000000000 +0200 +++ b/linux/linux.mk 2011-04-08 10:52:11.000000000 +0200 @@ -130,6 +130,13 @@ $(call KCONFIG_DISABLE_OPT,CONFIG_INITRAMFS_COMPRESSION_NONE,$(@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 $@ Index: b/package/busybox/S10mdev =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ b/package/busybox/S10mdev 2011-04-08 10:52:11.000000000 +0200 @@ -0,0 +1,22 @@ +#!/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 $? + + Index: b/package/busybox/busybox.mk =================================================================== --- a/package/busybox/busybox.mk 2011-04-08 10:51:42.000000000 +0200 +++ b/package/busybox/busybox.mk 2011-04-08 10:52:11.000000000 +0200 @@ -28,6 +28,19 @@ 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 @@ $(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 @@ $(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