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	SDB:SUSE Linux Hotplug System Overview - openSUSE
		The hotplug system is not only used for devices that can be plugged or unplugged at runtime, but for all devices detected after the kernel has booted.
		This is because hotplug events are handled asynchronously and therefore two drivers initialize their devices in parallel.
		Hotplug then writes the name of the module to load to the console and waits for N seconds before loading the module.
	en.opensuse.org /SDB:SUSE_Linux_Hotplug_System_Overview (1674 words)

	[No title]
		Hotplug does have a way of disabling the loading of drivers on a case by case basis.
		Hotplug can be disabled for a whole subsystem by editing the appropriate.rc script in /etc/hotplug, or just deleting/renaming those files.
		To use Hotplug network configuration with 16 bits Pcmcia cards, first make sure the Pcmcia subsystem is properly configured and that cardmgr loads the right driver module (in most case, it should).
	www.hpl.hp.com /personal/Jean_Tourrilhes/Linux/HOTPLUG.txt (4438 words)

	hotplug(8): hotplugging support scripts - Linux man page
		hotplug is a program which is used by the kernel to notify user mode software when some significant (usually hardware-related) events take place.
		The hotplug program path name is registered in /proc/sys/kernel/hotplug, and normally holds the value /sbin/hotplug.
		Hotplug agents should be used to dynamically adapt to system configuration changes.
	www.die.net /doc/linux/man/man8/hotplug.8.html (430 words)

	hotplug - Dynamic Hardware Configuration
		hotplug is a system for managing devices that can be dynamically attached to and removed from the system while it's running.
		The problem hotplug tries to solve is a very difficult one, especially for the land of Unix where hardware is accessed through device nodes and includes real permission checking.
		When the kernel is booting, it fakes hotplug events for all the devices already plugged in, and these events are handled by the rc files.
	www.bangmoney.org /presentations/hotplug (2372 words)

	[Hotplug_sig] Hotplug CPU Documentation (Site not responding. Last check: 2007-10-30)
		It is mainly based on the paper published at OLS 2004 entitled "Linux Kernel Hotplug CPU Support" and on the code currently in mainline.
		However CPU hotplug is not just useful to replace defective components it can also be applied in other contexts to increase the productivity of a system.
		For example on a single system running multiple Linux partitions, as the workloads change it would be extremely useful to be able to move CPUs from one partition to the next as required without rebooting or interrupting the workloads.
	lists.osdl.org /pipermail/hotplug_sig/2004-December/000097.html (1252 words)

	hotplug, udev and hal, oh my! (tummy.com, ltd. Journal Entry)
		Hotplug is run directly from the kernel when a new device is attached to your computer (usb, firewire, scsi).
		Next the script looks for a /etc/hotplug/usb.handmap, which ships with hotplug and is any additional modules that might not be known by the kernel that should be loaded for that device.
		There are likely a number of scripts available from a google search, like: http://www.raoult.com/palm/hotplug-visor There are also some pilot apps that run a daemon process that just waits for you to plug the pilot in and syncs it.
	www.tummy.com /journals/entries/kevin_20041219_131044 (731 words)

	Hotplug devices
		DDI 8 provides an infrastructure that supports ``hotplug'' devices, which are devices that can be added to and removed from the configuration without rebooting the system or reloading the driver.
		HPCI manages all interaction between the hotplug subsystem and the resource manager database and the specfs kernel subsystem that implements special device files.
		Passes hotplug operation requests from the HPCI to the bus and passes events to the HPCI.
	docsrv.sco.com /HDK_concepts/ddT_hotplug.html (620 words)

	hotplug (Site not responding. Last check: 2007-10-30)
		While the OS is initializing, the "cold-plugging" case, the hotplug script in /etc/init.d/hotplug (not used in RedHat) is invoked to make sure that all device connected at boot are properly configured, apply- ing the same rules as if they were connected later.
		Hotplug agents should be used to dynamically adapt to system configura- tion changes.
		hotplug is developed by Linux Hotplugging Project http://linux-hot- plug.sourceforge.net/ This manual page was originally written by Fumitoshi UKAI , for the Debian GNU/Linux system (but may be used by others), based on original Japanese version of manpage.
	ccrma.stanford.edu /planetccrma/man/man8/hotplug.8.html (456 words)

	Linux: hotplug-ng, Tiny Binaries for Autoloading Modules (Site not responding. Last check: 2007-10-30)
		Interface of hotplug script could change in a week or (more prob) in a month, that's ok to retouch C code at this frequence and is not very difficult.
		Also hotplug is not a matter of configuration, but a matter of auto-configuration, and "auto" say you all: you shouldn't do anything.
		I know that SATA hotplug is not yet supported, but in a near future, you may add a module_sata just like the module_scsi.
	kerneltrap.org /node/4706 (3715 words)

	HotPlug - ArchWiki
		This is done once, loading the proper modules and then hotplug exits - hotplug will not remain running as a "daemon" like cron or syslog, it does it's job then exits.
		The point is that you do not need to run the hotplug daemon for hotplug to work on your system, as it is not a real "daemon" in the unix sense of the word, only a script executed on boot.
		Hotplug itself is a set of scripts called by udev.
	wiki.archlinux.org /index.php/HotPlug (417 words)

	Linux Hotplugging
		Support for invoking the hotplug helper (/sbin/hotplug by default) when devices are added or removed.
		That hotplug helper usually contacts a policy agent which handles the USB-level configuration or activation tasks appropriate to this device and the current system configuration.
		Linux 2.2 (and later) kernels invoke the hotplug helper as /sbin/hotplug usb, with environment variables.
	linux-hotplug.sourceforge.net /?selected=usb (1220 words)

	Is it safe to boot without hotplug? - Ubuntu Forums
		The kernel provides uevents by two means, by running the user-space program specified in /proc/sys/kernel/hotplug (usually /sbin/hotplug) and passing environment variables to describe the device and point to the information in the /sys filesystem; or over a netlink socket with packets containing the same information.
		As the "hotplug" system relies on user-space forks, it is potentially racey as the handling of one event could be superseded by the handling of another, resulting in out-of-order events.
		For breezy we used a mixture of both methods because the input subsystem was not yet generating netlink events, in 2.6.15 this will have been fully converted to the new driver core and produces both kinds of events.
	ubuntuforums.org /showthread.php?t=97479 (671 words)

	[Hotplug_sig] Re: [dcl_tech_board] Announcing HotPlug SIG (Site not responding. Last check: 2007-10-30)
		Hotplug Memory: Has a very active mailing list with lots of good discussions happening, and real code being posted there.
		Hotplug IO subsystem: Already works today in 2.4 and 2.6.
		But again, there is already an active mailing list that the developers are all on and I've had discussions with the people who are actually doing this work already at OLS.
	lists.osdl.org /pipermail/hotplug_sig/2004-August/000002.html (438 words)

	Linux Hotplugging
		Hotplug lets you plug in new devices and use them immediately.
		In the Linux 2.6 kernel, hotplugging has been integrated with the driver model core so that any bus or class can report hotplug events when devices are added or removed.
		Basic hotplug support is included in almost all current distributions of GNU/Linux, including RedHat, Debian, and United Linux.
	linux-hotplug.sourceforge.net (303 words)

	Replacing Hotplug with LSHWD - ArchWiki
		Hotplug is a hardware detection daemon used in most Linux distributions.
		Hotplug's major problem is that it increases boot time by 10 seconds or more.
		Personaly, I have experienced these delays and also, hotplug sends error messages about not being able to load certain modules when trying to load other needed ones.
	wiki.archlinux.org /index.php/Replacing_Hotplug_with_LSHWD (261 words)

	LWN: Recent Changes to /sbin/hotplug
		Due to the driver model conversion of all different busses in the kernel, now hotplug events were being created for many more things than the linux-hotplug scripts cared about.
		When the kernel finds a new device and registers it with sysfs, a hotplug event is generated that describes the new device in a bus specific manner through a number of different environment variables.
		With the release of the 050 release of udev, if /sbin/udevstart is the kernel hotplug program (it can be changed by modifying the value of the /proc/sys/kernel/hotplug file), then it operates like the original /etc/hotplug.d multiplexer program as well as handling all of the udev device node generation.
	lwn.net /Articles/123932 (2149 words)

	X.Org Wiki - XInputHotplug
		The server knows about those devices that were present and configured at the time it was started, but it is not possible to add or remove devices during the lifetime of the server.
		The Linux platform supports hotplugging for mice and keyboards in an ad-hoc way by aggregating events from all mice into a special device (/dev/input/mice) and events from all keyboards are routed to the console driver.
		This effort aims to improve the situation; ideally it should not be required to edit the config file or restart the server to add, remove and configure input devices.
	wiki.x.org /wiki/XInputHotplug (674 words)

	Novell Documentation: Open Enterprise Server - The Hotplug System (Site not responding. Last check: 2007-10-30)
		LINUX was developed in connection with the Linux Hotplug project, but it has a few distinguishing features.
		The main difference is that, under SUSE LINUX, the scripts /sbin/hwup and /sbin/hwdown are used instead of the event multiplexer /etc/hotplug.d to initialize or stop hotplug devices.
		The hotplug system is not only used for devices that can be inserted and removed during operation, but also for all devices only detected after the kernel has been booted.
	www.novell.com /documentation/oes/sles_admin/data/hotplug.html (159 words)

	PCI Hotplug in Action (Site not responding. Last check: 2007-10-30)
		While the PCI hotplug specification identifies the technical requirements of a hotplug capable system, it doesn’t specify the implementation of this technology.
		The PCI hotplug system hardware performs two main functions: Powers down a single adapter slot, allowing insertion and removal of adapters; and protects the system and other adapters from the electrical effects of hot-plug operations.
		Hotplug electronics consist of two separate elements: the hotplug controller and the slot-specific power control.
	www.pcquest.com /content/hardware/101030102.asp (465 words)

	LKML: Greg KH: [ANNOUNCE] hotplug-ng 001 release
		These programs determine what module needs to be loaded when the kernel emits a hotplug event for these types of devices.
		Or if you have a huge box that spawns a zillion hotplug events all at once, and you need to be able to handle all of that with the minimum amount of processing time and memory.
		I still have a few more programs to write to get it up to the same functionality as the existing hotplug scripts (firmware, ieee1392, etc.) but those will be done soon.
	lkml.org /lkml/2005/2/10/179 (428 words)

	Hotplug Testing for Linux (Site not responding. Last check: 2007-10-30)
		Note that a bug was found in the CPU Hotplug implementation for x86 that hangs the system, so beware if you plan to run this on x86, it may crash your system.
		July 26, 2005 - MarkD has implemented hotplug test cases 6 and an update of 03, and we've produced a new release 0.4 of the lhcs_regression test suite.
		July 12, 2005 - MarkD has implemented hotplug test cases 3 and 4, and we've produced a new release 0.3 of the lhcs-regression test suite.
	developer.osdl.org /dev/hotplug (540 words)

	An improved Hotplug for 2.7 ? (Site not responding. Last check: 2007-10-30)
		But in this case, it's a pity that the kernel's hotplug ability is (in my opinion) so wrongly used by distros, and I'd be interested in tweaking an existing distro (say slack) in order to make it run the way I described above.
		There is (in my opinion) a serious shortcoming in the kernel hotplug system: events are not triggered at the appropriate time.
		For example, it happens fairly often that a hotplug event is fired before device files are created (for example the /proc/bus/usb files for USB, or the scsi files in /sys created by the scsi emulation for usb-storage).
	kerneltrap.org /node/3445 (585 words)

	Linux.com - Hotplug-able
		Hotplug will allow you to automatically run your syncronization software when you press your sync button.
		The scripts are available as a rpm package or tarball If installing the tarball package, please read the README file that is included on proper installation procedures.
		If all you are configuring is the Visor hotplug support, then most likely you'll just have to do this:
	www.linux.com /howtos/Handspring-Visor/hotplug.shtml (244 words)

	Hot Plug Notes - Waikato Linux Users Group
		If you use GNOME 2.6 or later, you can install and run gnome-volume-manager, which can do things like run a program when a camera is plugged in, or mount a removable storage device when plugged in.
		Set up a hotplug script that disables the touchpad when a usb mouse is added.
		By default, HotPlug in Debian (testing/unstable at least as of July 2004) won't automatically configure network interfaces.
	www.wlug.org.nz /HotPlugNotes (1080 words)

	PCI Hotplug for servers (Site not responding. Last check: 2007-10-30)
		PCI hotplug is an open, industry-standard technology pioneered by Compaq, and is increasingly being used in servers these days.
		Now, if the server supports hotplug functionality, it will notify the administrator of the failed NIC, which can then be replaced without shutting down the machine.
		Another advantage of PCI hotplug is that it’s compatible with previous PCI standards.
	www.ciol.com /content/flavour/servertech/101062001.asp (531 words)

	PCI Hotplug for servers (Site not responding. Last check: 2007-10-30)
		To enable PCI hotplug functionality, you primarily need: a PCI hotplug-capable server, a hotplug-aware operating system (OS) and software, software drivers for each adapter card to support hot plugging, and a hotplug-aware user interface.
		You can then use the hotplug user interface, which is nothing but a software interface, to inform the OS of the faulty PCI card.
		That is, a green light would indicate that the PCI slot is powered on and is functioning properly and an amber light would indicate that the slot requires attention.
	www.ciol.com /content/flavour/servertech/201062001.asp (578 words)

	Converting Device Drivers to Support PCI Hotplugging
		The focus of this paper is on bus interfaces, such as the PCI hotplugging specification (see the PCI Special Internet Group Web Site, which provide a controlled environment for hot removal and insertion of cards.
		Before you can convert a driver to be hotplug-capable, you need to understand hotplug scenarios and how they affect device drivers.
		Section 2 describes controlled PCI hotplugging as outlined in the PCI hotplug specification.
	developers.sun.com /solaris/developer/support/driver/wps/hotplug/hotplug.html (2263 words)

	hotplug logical devices?
		The second will cause hotplug to ifup all interfaces that are marked "auto" in /etc/network/interfaces.
		hotplug should probably handle all these events and the ifup in /etc/pcmcia/network.opts should be removed, but that would be problematic for people who upgrade.
		hotplug should probably > handle all these events and the ifup in /etc/pcmcia/network.opts > should be removed, but that would be problematic for people who > upgrade.
	www.webservertalk.com /message172629.html (1219 words)

	gmane.linux.hotplug.devel (Site not responding. Last check: 2007-10-30)
		As it has been explained, this is probably a bug/feature in the serverworks driver.
		There is no ide.agent script because there are no "real" IDE hotplug events from the kernel.
		Well, we are building a system that will have PCI-E hotplug and I need to make sure that Linux will support it.
	blog.gmane.org /gmane.linux.hotplug.devel/month=20041101 (1421 words)

	LWN: Patch: PCI hotplug changes for 2.5.46
		Here are some PCI hotplug driver updates for 2.5.46.
		A lot of files are touched, as some __init pci functions have been fixed to be __devinit, as the pci hotplug drivers now use them.
		Without it, this driver would only be useable as a module, which I've not figured out how to do with the new kernel configuration stuff.
	lwn.net /Articles/14709 (574 words)

	[No title]
		A: udev works entirely in userspace, using hotplug events the kernel sends whenever a device is added or removed from the kernel.
		Details about the devices are exported by the kernel to the sysfs filesystem at /sys All device naming policy permission control and event handling is done in userspace.
		All devices present on the system should generate hotplug events, loading the appropriate driver, and udev will notice and create the appropriate device node.
	www.kernel.org /pub/linux/utils/kernel/hotplug/udev-FAQ (870 words)

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