If you say Y here (and to one of the following options) and create a
character special file /dev/watchdog with major number 10 and minor
number 130 using mknod ("man mknod"), you will get a watchdog, i.e.:
subsequently opening the file and then failing to write to it for
longer than 1 minute will result in rebooting the machine. This
could be useful for a networked machine that needs to come back
on-line as fast as possible after a lock-up. There's both a watchdog
implementation entirely in software (which can sometimes fail to
reboot the machine) and a driver for hardware watchdog boards, which
are more robust and can also keep track of the temperature inside
your computer. For details, read
<file:Documentation/watchdog/watchdog-api.txt> in the kernel source.
The watchdog is usually used together with the watchdog daemon
which is available from
<ftp://ibiblio.org/pub/Linux/system/daemons/watchdog/>. This daemon can
also monitor NFS connections and can reboot the machine when the process
table is full.
If unsure, say N.
The default watchdog behaviour (which you get if you say N here) is to stop the timer if the process managing it closes the file /dev/watchdog. It's always remotely possible that this process might get killed. If you say Y here, the watchdog cannot be stopped once it has been started.
A software monitoring watchdog. This will fail to reboot your system from some situations that the hardware watchdog will recover from. Equally it's a lot cheaper to install. To compile this driver as a module, choose M here: the module will be called softdog.
Support for the watchdog in the WM831x AudioPlus PMICs. When the watchdog triggers the system will be reset.
Support for the watchdog in the WM8350 AudioPlus PMIC. When the watchdog triggers the system will be reset.
ARM Primecell SP805 Watchdog timer. This will reboot your system when the timeout is reached.
Watchdog timer embedded into AT91RM9200 chips. This will reboot your system when the timeout is reached.
Watchdog timer embedded into AT91SAM9X and AT91CAP9 chips. This will reboot your system when the timeout is reached.
The Intel Footbridge chip contains a built-in watchdog circuit. Say Y here if you wish to use this. Alternatively say M to compile the driver as a module, which will be called wdt285. This driver does not work on all machines. In particular, early CATS boards have hardware problems that will cause the machine to simply lock up if the watchdog fires. "If in doubt, leave it out" - say N.
Say Y here to include support for the WB977 watchdog included in NetWinder machines. Alternatively say M to compile the driver as a module, which will be called wdt977. Not sure? It's safe to say N.
Say Y here if to include support for the watchdog timer in the Intel IXP2000(2400, 2800, 2850) network processors. This driver can be built as a module by choosing M. The module will be called ixp2000_wdt. Say N if you are unsure.
Say Y here if to include support for the watchdog timer in the Intel IXP4xx network processors. This driver can be built as a module by choosing M. The module will be called ixp4xx_wdt. Note: The internal IXP4xx watchdog does a soft CPU reset which doesn't reset any peripherals. There are circumstances where the watchdog will fail to reset the board correctly (e.g., if the boot ROM is in an unreadable state). Say N if you are unsure.
Watchdog timer embedded into KS8695 processor. This will reboot your system when the timeout is reached.
This will include watchdog timer support for Samsung SoCs. If you want to include watchdog support for any machine, kindly select this in the respective mach-XXXX/Kconfig file.
Watchdog timer block in the Samsung SoCs. This will reboot the system when the timer expires with the watchdog enabled. The driver is limited by the speed of the system's PCLK signal, so with reasonably fast systems (PCLK around 50-66MHz) then watchdog intervals of over approximately 20seconds are unavailable. The driver can be built as a module by choosing M, and will be called s3c2410_wdt
Watchdog timer embedded into SA11x0 and PXA2xx chips. This will reboot your system when timeout is reached. NOTE: once enabled, this timer cannot be disabled. To compile this driver as a module, choose M here: the module will be called sa1100_wdt.
Watchdog timer embedded into the MPcore system. To compile this driver as a module, choose M here: the module will be called mpcore_wdt.
Say Y here if to include support for the watchdog timer embedded in the Cirrus Logic EP93xx family of devices. To compile this driver as a module, choose M here: the module will be called ep93xx_wdt.
Support for TI OMAP1610/OMAP1710/OMAP2420/OMAP3430/OMAP4430 watchdog. Say 'Y' here to enable the OMAP1610/OMAP1710/OMAP2420/OMAP3430/OMAP4430 watchdog timer.
Say Y here if to include support for the watchdog timer in the PNX4008 or LPC32XX processor. This driver can be built as a module by choosing M. The module will be called pnx4008_wdt. Say N if you are unsure.
Say Y here if to include support for the watchdog timer in the Intel IOP3XX & IOP13XX I/O Processors. This driver can be built as a module by choosing M. The module will be called iop_wdt. Note: The IOP13XX watchdog does an Internal Bus Reset which will affect both cores and the peripherals of the IOP. The ATU-X and/or ATUe configuration registers will remain intact, but if operating as an Root Complex and/or Central Resource, the PCI-X and/or PCIe busses will also be reset. THIS IS A VERY BIG HAMMER.
Say Y here if to include support for the watchdog timer in the DaVinci DM644x/DM646x processors. To compile this driver as a module, choose M here: the module will be called davinci_wdt. NOTE: once enabled, this timer cannot be disabled. Say N if you are unsure.
Say Y here if to include support for the watchdog timer in the Marvell Orion5x and Kirkwood ARM SoCs. To compile this driver as a module, choose M here: the module will be called orion_wdt.
Say Y here to include Watchdog timer support for the watchdog embedded into the ST-Ericsson U300 series platforms. This watchdog is used to reset the system and thus cannot be compiled as a module.
Support for TI TWL4030 watchdog. Say 'Y' here to enable the watchdog timer support for TWL4030 chips.
Say Y here if to include support for the watchdog timer for the Sigmatel STMP37XX/378X SoC. To compile this driver as a module, choose M here: the module will be called stmp3xxx_wdt.
Say Y here if to include support for the watchdog timer for the Nuvoton NUC900 series SoCs. To compile this driver as a module, choose M here: the module will be called nuc900_wdt.
Say Y here if you want support for the watchdog timer on Avionic Design Xanthos boards.
Technologic Systems TS-7200, TS-7250 and TS-7260 boards have watchdog timer implemented in a external CPLD chip. Say Y here if you want to support for the watchdog timer on TS-72XX boards. To compile this driver as a module, choose M here: the module will be called ts72xx_wdt.
Support for memory mapped max63{69,70,71,72,73,74} watchdog timer.
This is the driver for the hardware watchdog on the Freescale IMX2 and later processors. If you have one of these processors and wish to have watchdog support enabled, say Y, otherwise say N. To compile this driver as a module, choose M here: the module will be called imx2_wdt.
Watchdog timer embedded into AT32AP700x devices. This will reboot your system when the timeout is reached.
If you say yes here you will get support for the Blackfin On-Chip Watchdog Timer. If you have one of these processors and wish to have watchdog support enabled, say Y, otherwise say N. To compile this driver as a module, choose M here: the module will be called bfin_wdt.
This is the driver for the hardware watchdog on Single Board Computers produced by Acquire Inc (and others). This watchdog simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. To compile this driver as a module, choose M here: the module will be called acquirewdt. Most people will say N.
If you are configuring a Linux kernel for the Advantech single-board computer, say `Y' here to support its built-in watchdog timer feature. More information can be found at <http://www.advantech.com.tw/products/>
This is the driver for the hardware watchdog on the ALi M1535 PMU. To compile this driver as a module, choose M here: the module will be called alim1535_wdt. Most people will say N.
This is the driver for the hardware watchdog on the ALi M7101 PMU as used in the x86 Cobalt servers and also found in some SPARC Netra servers too. To compile this driver as a module, choose M here: the module will be called alim7101_wdt. Most people will say N.
This is the driver for the hardware watchdog on the Fintek F71808E, F71862FG, F71869, F71882FG and F71889FG Super I/O controllers. You can compile this driver directly into the kernel, or use it as a module. The module will be called f71808e_wdt.
Hardware watchdog driver for the AMD/ATI SP5100 chipset. The TCO (Total Cost of Ownership) timer is a watchdog timer that will reboot the machine after its expiration. The expiration time can be configured with the "heartbeat" parameter. To compile this driver as a module, choose M here: the module will be called sp5100_tco.
This driver enables a watchdog capability built into the CS5535/CS5536 companion chips for the AMD Geode GX and LX processors. This watchdog watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. You can compile this driver directly into the kernel, or use it as a module. The module will be called geodewdt.
This is the driver for the hardware watchdog built in to the AMD "Elan" SC520 microcomputer commonly used in embedded systems. This watchdog simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. You can compile this driver directly into the kernel, or use it as a module. The module will be called sc520_wdt.
This is the driver for the built-in watchdog timer on the fit-PC2, fit-PC2i, CM-iAM single-board computers made by Compulab. It`s possible to enable watchdog timer either from BIOS (F2) or from booted Linux. When "Watchdog Timer Value" enabled one can set 31-255 s operational range. Entering BIOS setup temporary disables watchdog operation regardless to current state, so system will not be restarted while user in BIOS setup. Once watchdog was enabled the system will be restarted every "Watchdog Timer Value" period, so to prevent it user can restart or disable the watchdog. To compile this driver as a module, choose M here: the module will be called sbc_fitpc2_wdt. Most people will say N.
Enable support for the watchdog timer on the Eurotech CPU-1220 and CPU-1410 cards. These are PC/104 SBCs. Spec sheets and product information are at <http://www.eurotech.it/>.
This is the driver for the hardware watchdog on the IB700 Single Board Computer produced by TMC Technology (www.tmc-uk.com). This watchdog simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. This driver is like the WDT501 driver but for slightly different hardware. To compile this driver as a module, choose M here: the module will be called ib700wdt. Most people will say N.
This is the driver for the IBM Automatic Server Restart watchdog timer built-in into some eServer xSeries machines. To compile this driver as a module, choose M here: the module will be called ibmasr.
This is a driver for the hardware watchdog on the ICP Single Board Computer. This driver is working on (at least) the following IPC SBC's: Wafer 5823, Rocky 4783, Rocky 3703 and Rocky 3782. To compile this driver as a module, choose M here: the module will be called wafer5823wdt.
Hardware driver for the watchdog timer built into the Intel 6300ESB controller hub. To compile this driver as a module, choose M here: the module will be called i6300esb.
Hardware driver for the watchdog time built into the Intel SCU for Intel Mobile Platforms. To compile this driver as a module, choose M here.
Hardware driver for the intel TCO timer based watchdog devices. These drivers are included in the Intel 82801 I/O Controller Hub family (from ICH0 up to ICH10) and in the Intel 63xxESB controller hub. The TCO (Total Cost of Ownership) timer is a watchdog timer that will reboot the machine after its second expiration. The expiration time can be configured with the "heartbeat" parameter. On some motherboards the driver may fail to reset the chipset's NO_REBOOT flag which prevents the watchdog from rebooting the machine. If this is the case you will get a kernel message like "failed to reset NO_REBOOT flag, reboot disabled by hardware". To compile this driver as a module, choose M here: the module will be called iTCO_wdt.
Add vendor specific support to the intel TCO timer based watchdog devices. At this moment we only have additional support for some SuperMicro Inc. motherboards.
This is the driver for the built-in watchdog timer on the IT8712F Super I/0 chipset used on many motherboards. If the driver does not work, then make sure that the game port in the BIOS is enabled. To compile this driver as a module, choose M here: the module will be called it8712f_wdt.
This is the driver for the hardware watchdog on the ITE IT8702, IT8712, IT8716, IT8718, IT8720, IT8721, IT8726 Super I/O chips. This watchdog simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. To compile this driver as a module, choose M here: the module will be called it87_wdt.
A software monitoring watchdog and NMI sourcing driver. This driver will detect lockups and provide a stack trace. This is a driver that will only load on an HP ProLiant system with a minimum of iLO2 support. To compile this driver as a module, choose M here: the module will be called hpwdt.
When an NMI occurs this feature will make the necessary BIOS calls to log the cause of the NMI.
This is a driver for National Semiconductor PC87307/PC97307 hardware watchdog cards as found on the SC1200. This watchdog is mainly used for power management purposes and can be used to power down the device during inactivity periods (includes interrupt activity monitoring). To compile this driver as a module, choose M here: the module will be called sc1200wdt. Most people will say N.
Enable the built-in watchdog timer support on the National Semiconductor SCx200 processors. If compiled as a module, it will be called scx200_wdt.
This is the driver for the hardware watchdog on the PC87413 chipset This watchdog simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. To compile this driver as a module, choose M here: the module will be called pc87413_wdt. Most people will say N.
Hardware driver for the TCO timer built into the nVidia Hub family (such as the MCP51). The TCO (Total Cost of Ownership) timer is a watchdog timer that will reboot the machine after its second expiration. The expiration time can be configured with the "heartbeat" parameter. On some motherboards the driver may fail to reset the chipset's NO_REBOOT flag which prevents the watchdog from rebooting the machine. If this is the case you will get a kernel message like "failed to reset NO_REBOOT flag, reboot disabled by hardware". To compile this driver as a module, choose M here: the module will be called nv_tco.
This is the driver for the built in hardware watchdog in the RDC R-321x SoC. To compile this driver as a module, choose M here: the module will be called rdc321x_wdt.
This driver can be used with the watchdog timer found on some single board computers, namely the 6010 PII based computer. It may well work with other cards. It reads port 0x443 to enable and re-set the watchdog timer, and reads port 0x45 to disable the watchdog. If you have a card that behave in similar ways, you can probably make this driver work with your card as well. You can compile this driver directly into the kernel, or use it as a module. The module will be called sbc60xxwdt.
This is the driver for the hardware watchdog on the SBC8360 Single Board Computer produced by Axiomtek Co., Ltd. (www.axiomtek.com). To compile this driver as a module, choose M here: the module will be called sbc8360. Most people will say N.
This is the driver for the hardware watchdog found on the IEI single board computers EPIC Nano 7240 (and likely others). This watchdog simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. To compile this driver as a module, choose M here: the module will be called sbc7240_wdt.
TBD. To compile this driver as a module, choose M here: the module will be called cpu5wdt.
This is the driver for the hardware watchdog timer on the SMSC SCH3112, SCH3114 and SCH3116 Super IO chipset (LPC IO with 8042 KBC, Reset Generation, HWM and multiple serial ports). To compile this driver as a module, choose M here: the module will be called sch311x_wdt.
This is the driver for the hardware watchdog component on the Winbond SMsC37B787 chipset as used on the NetRunner Mainboard from Vision Systems and maybe others. This watchdog simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. Usually a userspace daemon will notify the kernel WDT driver that userspace is still alive, at regular intervals. To compile this driver as a module, choose M here: the module will be called smsc37b787_wdt. Most people will say N.
This is the driver for the hardware watchdog on the W83627HF chipset as used in Advantech PC-9578 and Tyan S2721-533 motherboards (and likely others). The driver also supports the W83627DHG chip. This watchdog simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. To compile this driver as a module, choose M here: the module will be called w83627hf_wdt. Most people will say N.
This is the driver for the hardware watchdog on the W83697HF/HG chipset as used in Dedibox/VIA motherboards (and likely others). This watchdog simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. To compile this driver as a module, choose M here: the module will be called w83697hf_wdt. Most people will say N.
This is the driver for the hardware watchdog on the W83697UG/UF chipset as used in MSI Fuzzy CX700 VIA motherboards (and likely others). This watchdog simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. To compile this driver as a module, choose M here: the module will be called w83697ug_wdt. Most people will say N.
This is the driver for the hardware watchdog on the W83877F chipset as used in EMACS PC-104 motherboards (and likely others). This watchdog simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. To compile this driver as a module, choose M here: the module will be called w83877f_wdt. Most people will say N.
This is the driver for the hardware watchdog on the W83977F I/O chip as used in AAEON's PCM-5335 SBC (and likely others). This watchdog simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. To compile this driver as a module, choose M here: the module will be called w83977f_wdt.
If you are using a ZF Micro MachZ processor, say Y here, otherwise N. This is the driver for the watchdog timer built-in on that processor using ZF-Logic interface. This watchdog simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. To compile this driver as a module, choose M here: the module will be called machzwd.
This is the driver for the built-in watchdog timer on the EPX-C3 Single-board computer made by Winsystems, Inc. *Note*: This hardware watchdog is not probeable and thus there is no way to know if writing to its IO address will corrupt your system or have any real effect. The only way to be sure that this driver does what you want is to make sure you are running it on an EPX-C3 from Winsystems with the watchdog timer at IO address 0x1ee and 0x1ef. It will write to both those IO ports. Basically, the assumption is made that if you compile this driver into your kernel and/or load it as a module, that you know what you are doing and that you are in fact running on an EPX-C3 board! To compile this driver as a module, choose M here: the module will be called sbc_epx_c3.
To compile this driver as a module, choose M here: the module will be called m54xx_wdt.
Hardware driver for the built-in watchdog timer on the Atheros AR71XX/AR724X/AR913X SoCs.
Hardware driver for the Broadcom BCM47xx Watchog Timer.
Hardware driver for the IDT RC32434 SoC built-in watchdog timer. To compile this driver as a module, choose M here: the module will be called rc32434_wdt.
Hardware driver for the Indy's/I2's watchdog. This is a watchdog timer that will reboot the machine after a 60 second timer expired and no process has written to /dev/watchdog during that time.
Hardware driver for the built-in watchdog timer on Ingenic jz4740 SoCs.
Hardware driver for the MTX-1 boards. This is a watchdog timer that will reboot the machine after a 100 seconds timer expired.
Hardware driver for the PNX833x's watchdog. This is a watchdog timer that will reboot the machine after a programmable timer has expired and no process has written to /dev/watchdog during that time.
Watchdog driver for the built in watchdog hardware in Sibyte SoC processors. There are apparently two watchdog timers on such processors; this driver supports only the first one, because currently Linux only supports exporting one watchdog to userspace. To compile this driver as a loadable module, choose M here. The module will be called sb_wdog.
Hardware driver for the TI AR7 Watchdog Timer.
Hardware driver for the built-in watchdog timer on TXx9 MIPS SoCs.
Hardware driver for OCTEON's on chip watchdog timer. Enables the watchdog for all cores running Linux. It installs a NMI handler and pokes the watchdog based on an interrupt. On first expiration of the watchdog, the interrupt handler pokes it. The second expiration causes an NMI that prints a message. The third expiration causes a global soft reset. When userspace has /dev/watchdog open, no poking is done from the first interrupt, it is then only poked when the device is written.
Watchdog driver for the built in watchdog hardware in Broadcom BCM63xx SoC. To compile this driver as a loadable module, choose M here. The module will be called bcm63xx_wdt.
Hardware driver for the Lantiq SoC Watchdog Timer.
Watchdog timer found in a number of GE single board computers.
Use General Purpose Timer (GPT) 0 on the MPC5200 as Watchdog.
This driver is for a SoC level watchdog that exists on some Freescale PowerPC processors. So far this driver supports: - MPC8xx watchdogs - MPC83xx watchdogs - MPC86xx watchdogs For BookE processors (MPC85xx) use the BOOKE_WDT driver instead.
This enables the watchdog in the PIKA FPGA. Currently used on the Warp platform.
Watchdog driver for PowerPC Book-E chips, such as the Freescale MPC85xx SOCs and the IBM PowerPC 440. Please see Documentation/watchdog/watchdog-api.txt for more information.
Select the default watchdog timer period to be used by the PowerPC Book-E watchdog driver. A watchdog "event" occurs when the bit position represented by this number transitions from zero to one. For Freescale Book-E processors, this is a number between 0 and 63. For other Book-E processors, this is a number between 0 and 3. The value can be overidden by the wdt_period command-line parameter.
This driver adds watchdog support for the RTAS watchdog. To compile this driver as a module, choose M here. The module will be called wdrtas.
IBM s/390 and zSeries machines running under z/VM 5.1 or later provide a virtual watchdog timer to their guest that cause a user define Control Program command to be executed after a timeout. To compile this driver as a module, choose M here. The module will be called vmwatchdog.
This driver adds watchdog support for the integrated watchdog in the SuperH processors. If you have one of these processors and wish to have watchdog support enabled, say Y, otherwise say N. As a side note, saying Y here will automatically boost HZ to 1000 so that the timer has a chance to clear the overflow counter. On slower systems (such as the SH-2 and SH-3) this will likely yield some performance issues. As such, the WDT should be avoided here unless it is absolutely necessary. To compile this driver as a module, choose M here: the module will be called shwdt.
This is the driver for the hardware watchdog timers present on Sun Microsystems CompactPCI models CP1400 and CP1500. To compile this driver as a module, choose M here: the module will be called cpwatchdog. If you do not have a CompactPCI model CP1400 or CP1500, or another UltraSPARC-IIi-cEngine boardset with hardware watchdog, you should say N to this option.
Say Y here to support the hardware watchdog capability on Sun RIO machines. The watchdog timeout period is normally one minute but can be changed with a boot-time parameter.
Say Y here to support the hypervisor watchdog capability provided by Xen 4.0 and newer. The watchdog timeout period is normally one minute but can be changed with a boot-time parameter.
This is the driver for the Berkshire Products ISA-PC Watchdog card. This card simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. This driver is like the WDT501 driver but for different hardware. Please read <file:Documentation/watchdog/pcwd-watchdog.txt>. The PC watchdog cards can be ordered from <http://www.berkprod.com/>. To compile this driver as a module, choose M here: the module will be called pcwd. Most people will say N.
This is a driver for the Mixcom hardware watchdog cards. This watchdog simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. To compile this driver as a module, choose M here: the module will be called mixcomwd. Most people will say N.
If you have a WDT500P or WDT501P watchdog board, say Y here, otherwise N. It is not possible to probe for this board, which means that you have to inform the kernel about the IO port and IRQ that is needed (you can do this via the io and irq parameters) To compile this driver as a module, choose M here: the module will be called wdt.
This is the driver for the Berkshire Products PCI-PC Watchdog card. This card simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. The card can also monitor the internal temperature of the PC. More info is available at <http://www.berkprod.com/pci_pc_watchdog.htm>. To compile this driver as a module, choose M here: the module will be called pcwd_pci. Most people will say N.
If you have a PCI-WDT500/501 watchdog board, say Y here, otherwise N. If you have a PCI-WDT501 watchdog board then you can enable the temperature sensor by setting the type parameter to 501. If you want to enable the Fan Tachometer on the PCI-WDT501, then you can do this via the tachometer parameter. Only do this if you have a fan tachometer actually set up. To compile this driver as a module, choose M here: the module will be called wdt_pci.
This is the driver for the Berkshire Products USB-PC Watchdog card. This card simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain amount of time. The card can also monitor the internal temperature of the PC. More info is available at <http://www.berkprod.com/usb_pc_watchdog.htm>. To compile this driver as a module, choose M here: the module will be called pcwd_usb. Most people will say N.