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authorLinus Torvalds <torvalds@linux-foundation.org>2010-05-25 14:40:40 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-25 14:40:40 -0400
commit51e618c357b39597b474165c5d17067afe8f16a6 (patch)
treecbff778a0cc10732958384d24a26e5fde08867c5 /Documentation
parentf16a5e347835c6a0ba958535cf6e6c89d50463b8 (diff)
parentbb2fd8a844d3a9209599b5fb694b30ac46a56ef0 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog
* git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog: watchdog: Driver for the watchdog timer on Freescale IMX2 (and later) processors. watchdog: s3c2410_wdt - Fix on handling of the request_mem_region fail watchdog: s3c2410_wdt - Add extra option to include watchdog for Samsung SoCs iTCO_wdt: fix TCO V1 timeout values and limits watchdog: twl4030_wdt: Disable watchdog during probing watchdog: update/improve/consolidate watchdog driver watchdog: booke_wdt: fix ioctl status flags watchdog: fix several MODULE_PARM_DESC strings watchdog: bfin: use new common Blackfin watchdog header
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/kernel-parameters.txt15
-rw-r--r--Documentation/watchdog/00-INDEX5
-rw-r--r--Documentation/watchdog/watchdog-parameters.txt390
-rw-r--r--Documentation/watchdog/wdt.txt15
4 files changed, 410 insertions, 15 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index f5fce483930..b56ea860da2 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -290,9 +290,6 @@ and is between 256 and 4096 characters. It is defined in the file
290 advansys= [HW,SCSI] 290 advansys= [HW,SCSI]
291 See header of drivers/scsi/advansys.c. 291 See header of drivers/scsi/advansys.c.
292 292
293 advwdt= [HW,WDT] Advantech WDT
294 Format: <iostart>,<iostop>
295
296 aedsp16= [HW,OSS] Audio Excel DSP 16 293 aedsp16= [HW,OSS] Audio Excel DSP 16
297 Format: <io>,<irq>,<dma>,<mss_io>,<mpu_io>,<mpu_irq> 294 Format: <io>,<irq>,<dma>,<mss_io>,<mpu_io>,<mpu_irq>
298 See also header of sound/oss/aedsp16.c. 295 See also header of sound/oss/aedsp16.c.
@@ -765,9 +762,6 @@ and is between 256 and 4096 characters. It is defined in the file
765 This option is obsoleted by the "netdev=" option, which 762 This option is obsoleted by the "netdev=" option, which
766 has equivalent usage. See its documentation for details. 763 has equivalent usage. See its documentation for details.
767 764
768 eurwdt= [HW,WDT] Eurotech CPU-1220/1410 onboard watchdog.
769 Format: <io>[,<irq>]
770
771 failslab= 765 failslab=
772 fail_page_alloc= 766 fail_page_alloc=
773 fail_make_request=[KNL] 767 fail_make_request=[KNL]
@@ -2267,9 +2261,6 @@ and is between 256 and 4096 characters. It is defined in the file
2267 2261
2268 sched_debug [KNL] Enables verbose scheduler debug messages. 2262 sched_debug [KNL] Enables verbose scheduler debug messages.
2269 2263
2270 sc1200wdt= [HW,WDT] SC1200 WDT (watchdog) driver
2271 Format: <io>[,<timeout>[,<isapnp>]]
2272
2273 scsi_debug_*= [SCSI] 2264 scsi_debug_*= [SCSI]
2274 See drivers/scsi/scsi_debug.c. 2265 See drivers/scsi/scsi_debug.c.
2275 2266
@@ -2858,8 +2849,10 @@ and is between 256 and 4096 characters. It is defined in the file
2858 wd7000= [HW,SCSI] 2849 wd7000= [HW,SCSI]
2859 See header of drivers/scsi/wd7000.c. 2850 See header of drivers/scsi/wd7000.c.
2860 2851
2861 wdt= [WDT] Watchdog 2852 watchdog timers [HW,WDT] For information on watchdog timers,
2862 See Documentation/watchdog/wdt.txt. 2853 see Documentation/watchdog/watchdog-parameters.txt
2854 or other driver-specific files in the
2855 Documentation/watchdog/ directory.
2863 2856
2864 x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of 2857 x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of
2865 default x2apic cluster mode on platforms 2858 default x2apic cluster mode on platforms
diff --git a/Documentation/watchdog/00-INDEX b/Documentation/watchdog/00-INDEX
index c3ea47e507f..ee994513a9b 100644
--- a/Documentation/watchdog/00-INDEX
+++ b/Documentation/watchdog/00-INDEX
@@ -1,10 +1,15 @@
100-INDEX 100-INDEX
2 - this file. 2 - this file.
3hpwdt.txt
4 - information on the HP iLO2 NMI watchdog
3pcwd-watchdog.txt 5pcwd-watchdog.txt
4 - documentation for Berkshire Products PC Watchdog ISA cards. 6 - documentation for Berkshire Products PC Watchdog ISA cards.
5src/ 7src/
6 - directory holding watchdog related example programs. 8 - directory holding watchdog related example programs.
7watchdog-api.txt 9watchdog-api.txt
8 - description of the Linux Watchdog driver API. 10 - description of the Linux Watchdog driver API.
11watchdog-parameters.txt
12 - information on driver parameters (for drivers other than
13 the ones that have driver-specific files here)
9wdt.txt 14wdt.txt
10 - description of the Watchdog Timer Interfaces for Linux. 15 - description of the Watchdog Timer Interfaces for Linux.
diff --git a/Documentation/watchdog/watchdog-parameters.txt b/Documentation/watchdog/watchdog-parameters.txt
new file mode 100644
index 00000000000..41c95cc1dc1
--- /dev/null
+++ b/Documentation/watchdog/watchdog-parameters.txt
@@ -0,0 +1,390 @@
1This file provides information on the module parameters of many of
2the Linux watchdog drivers. Watchdog driver parameter specs should
3be listed here unless the driver has its own driver-specific information
4file.
5
6
7See Documentation/kernel-parameters.txt for information on
8providing kernel parameters for builtin drivers versus loadable
9modules.
10
11
12-------------------------------------------------
13acquirewdt:
14wdt_stop: Acquire WDT 'stop' io port (default 0x43)
15wdt_start: Acquire WDT 'start' io port (default 0x443)
16nowayout: Watchdog cannot be stopped once started
17 (default=kernel config parameter)
18-------------------------------------------------
19advantechwdt:
20wdt_stop: Advantech WDT 'stop' io port (default 0x443)
21wdt_start: Advantech WDT 'start' io port (default 0x443)
22timeout: Watchdog timeout in seconds. 1<= timeout <=63, default=60.
23nowayout: Watchdog cannot be stopped once started
24 (default=kernel config parameter)
25-------------------------------------------------
26alim1535_wdt:
27timeout: Watchdog timeout in seconds. (0 < timeout < 18000, default=60
28nowayout: Watchdog cannot be stopped once started
29 (default=kernel config parameter)
30-------------------------------------------------
31alim7101_wdt:
32timeout: Watchdog timeout in seconds. (1<=timeout<=3600, default=30
33use_gpio: Use the gpio watchdog (required by old cobalt boards).
34 default=0/off/no
35nowayout: Watchdog cannot be stopped once started
36 (default=kernel config parameter)
37-------------------------------------------------
38ar7_wdt:
39margin: Watchdog margin in seconds (default=60)
40nowayout: Disable watchdog shutdown on close
41 (default=kernel config parameter)
42-------------------------------------------------
43at32ap700x_wdt:
44timeout: Timeout value. Limited to be 1 or 2 seconds. (default=2)
45nowayout: Watchdog cannot be stopped once started
46 (default=kernel config parameter)
47-------------------------------------------------
48at91rm9200_wdt:
49wdt_time: Watchdog time in seconds. (default=5)
50nowayout: Watchdog cannot be stopped once started
51 (default=kernel config parameter)
52-------------------------------------------------
53at91sam9_wdt:
54heartbeat: Watchdog heartbeats in seconds. (default = 15)
55nowayout: Watchdog cannot be stopped once started
56 (default=kernel config parameter)
57-------------------------------------------------
58bcm47xx_wdt:
59wdt_time: Watchdog time in seconds. (default=30)
60nowayout: Watchdog cannot be stopped once started
61 (default=kernel config parameter)
62-------------------------------------------------
63bfin_wdt:
64timeout: Watchdog timeout in seconds. (1<=timeout<=((2^32)/SCLK), default=20)
65nowayout: Watchdog cannot be stopped once started
66 (default=kernel config parameter)
67-------------------------------------------------
68coh901327_wdt:
69margin: Watchdog margin in seconds (default 60s)
70-------------------------------------------------
71cpu5wdt:
72port: base address of watchdog card, default is 0x91
73verbose: be verbose, default is 0 (no)
74ticks: count down ticks, default is 10000
75-------------------------------------------------
76cpwd:
77wd0_timeout: Default watchdog0 timeout in 1/10secs
78wd1_timeout: Default watchdog1 timeout in 1/10secs
79wd2_timeout: Default watchdog2 timeout in 1/10secs
80-------------------------------------------------
81davinci_wdt:
82heartbeat: Watchdog heartbeat period in seconds from 1 to 600, default 60
83-------------------------------------------------
84ep93xx_wdt:
85nowayout: Watchdog cannot be stopped once started
86timeout: Watchdog timeout in seconds. (1<=timeout<=3600, default=TBD)
87-------------------------------------------------
88eurotechwdt:
89nowayout: Watchdog cannot be stopped once started
90 (default=kernel config parameter)
91io: Eurotech WDT io port (default=0x3f0)
92irq: Eurotech WDT irq (default=10)
93ev: Eurotech WDT event type (default is `int')
94-------------------------------------------------
95gef_wdt:
96nowayout: Watchdog cannot be stopped once started
97 (default=kernel config parameter)
98-------------------------------------------------
99geodewdt:
100timeout: Watchdog timeout in seconds. 1<= timeout <=131, default=60.
101nowayout: Watchdog cannot be stopped once started
102 (default=kernel config parameter)
103-------------------------------------------------
104i6300esb:
105heartbeat: Watchdog heartbeat in seconds. (1<heartbeat<2046, default=30)
106nowayout: Watchdog cannot be stopped once started
107 (default=kernel config parameter)
108-------------------------------------------------
109iTCO_wdt:
110heartbeat: Watchdog heartbeat in seconds.
111 (2<heartbeat<39 (TCO v1) or 613 (TCO v2), default=30)
112nowayout: Watchdog cannot be stopped once started
113 (default=kernel config parameter)
114-------------------------------------------------
115iTCO_vendor_support:
116vendorsupport: iTCO vendor specific support mode, default=0 (none),
117 1=SuperMicro Pent3, 2=SuperMicro Pent4+, 911=Broken SMI BIOS
118-------------------------------------------------
119ib700wdt:
120timeout: Watchdog timeout in seconds. 0<= timeout <=30, default=30.
121nowayout: Watchdog cannot be stopped once started
122 (default=kernel config parameter)
123-------------------------------------------------
124ibmasr:
125nowayout: Watchdog cannot be stopped once started
126 (default=kernel config parameter)
127-------------------------------------------------
128indydog:
129nowayout: Watchdog cannot be stopped once started
130 (default=kernel config parameter)
131-------------------------------------------------
132iop_wdt:
133nowayout: Watchdog cannot be stopped once started
134 (default=kernel config parameter)
135-------------------------------------------------
136it8712f_wdt:
137margin: Watchdog margin in seconds (default 60)
138nowayout: Disable watchdog shutdown on close
139 (default=kernel config parameter)
140-------------------------------------------------
141it87_wdt:
142nogameport: Forbid the activation of game port, default=0
143exclusive: Watchdog exclusive device open, default=1
144timeout: Watchdog timeout in seconds, default=60
145testmode: Watchdog test mode (1 = no reboot), default=0
146nowayout: Watchdog cannot be stopped once started
147 (default=kernel config parameter)
148-------------------------------------------------
149ixp2000_wdt:
150heartbeat: Watchdog heartbeat in seconds (default 60s)
151nowayout: Watchdog cannot be stopped once started
152 (default=kernel config parameter)
153-------------------------------------------------
154ixp4xx_wdt:
155heartbeat: Watchdog heartbeat in seconds (default 60s)
156nowayout: Watchdog cannot be stopped once started
157 (default=kernel config parameter)
158-------------------------------------------------
159ks8695_wdt:
160wdt_time: Watchdog time in seconds. (default=5)
161nowayout: Watchdog cannot be stopped once started
162 (default=kernel config parameter)
163-------------------------------------------------
164machzwd:
165nowayout: Watchdog cannot be stopped once started
166 (default=kernel config parameter)
167action: after watchdog resets, generate:
168 0 = RESET(*) 1 = SMI 2 = NMI 3 = SCI
169-------------------------------------------------
170max63xx_wdt:
171heartbeat: Watchdog heartbeat period in seconds from 1 to 60, default 60
172nowayout: Watchdog cannot be stopped once started
173 (default=kernel config parameter)
174nodelay: Force selection of a timeout setting without initial delay
175 (max6373/74 only, default=0)
176-------------------------------------------------
177mixcomwd:
178nowayout: Watchdog cannot be stopped once started
179 (default=kernel config parameter)
180-------------------------------------------------
181mpc8xxx_wdt:
182timeout: Watchdog timeout in ticks. (0<timeout<65536, default=65535)
183reset: Watchdog Interrupt/Reset Mode. 0 = interrupt, 1 = reset
184nowayout: Watchdog cannot be stopped once started
185 (default=kernel config parameter)
186-------------------------------------------------
187mpcore_wdt:
188mpcore_margin: MPcore timer margin in seconds.
189 (0 < mpcore_margin < 65536, default=60)
190nowayout: Watchdog cannot be stopped once started
191 (default=kernel config parameter)
192mpcore_noboot: MPcore watchdog action, set to 1 to ignore reboots,
193 0 to reboot (default=0
194-------------------------------------------------
195mv64x60_wdt:
196nowayout: Watchdog cannot be stopped once started
197 (default=kernel config parameter)
198-------------------------------------------------
199nuc900_wdt:
200heartbeat: Watchdog heartbeats in seconds.
201 (default = 15)
202nowayout: Watchdog cannot be stopped once started
203 (default=kernel config parameter)
204-------------------------------------------------
205omap_wdt:
206timer_margin: initial watchdog timeout (in seconds)
207-------------------------------------------------
208orion_wdt:
209heartbeat: Initial watchdog heartbeat in seconds
210nowayout: Watchdog cannot be stopped once started
211 (default=kernel config parameter)
212-------------------------------------------------
213pc87413_wdt:
214io: pc87413 WDT I/O port (default: io).
215timeout: Watchdog timeout in minutes (default=timeout).
216nowayout: Watchdog cannot be stopped once started
217 (default=kernel config parameter)
218-------------------------------------------------
219pika_wdt:
220heartbeat: Watchdog heartbeats in seconds. (default = 15)
221nowayout: Watchdog cannot be stopped once started
222 (default=kernel config parameter)
223-------------------------------------------------
224pnx4008_wdt:
225heartbeat: Watchdog heartbeat period in seconds from 1 to 60, default 19
226nowayout: Set to 1 to keep watchdog running after device release
227-------------------------------------------------
228pnx833x_wdt:
229timeout: Watchdog timeout in Mhz. (68Mhz clock), default=2040000000 (30 seconds)
230nowayout: Watchdog cannot be stopped once started
231 (default=kernel config parameter)
232start_enabled: Watchdog is started on module insertion (default=1)
233-------------------------------------------------
234rc32434_wdt:
235timeout: Watchdog timeout value, in seconds (default=20)
236nowayout: Watchdog cannot be stopped once started
237 (default=kernel config parameter)
238-------------------------------------------------
239riowd:
240riowd_timeout: Watchdog timeout in minutes (default=1)
241-------------------------------------------------
242s3c2410_wdt:
243tmr_margin: Watchdog tmr_margin in seconds. (default=15)
244tmr_atboot: Watchdog is started at boot time if set to 1, default=0
245nowayout: Watchdog cannot be stopped once started
246 (default=kernel config parameter)
247soft_noboot: Watchdog action, set to 1 to ignore reboots, 0 to reboot
248debug: Watchdog debug, set to >1 for debug, (default 0)
249-------------------------------------------------
250sa1100_wdt:
251margin: Watchdog margin in seconds (default 60s)
252-------------------------------------------------
253sb_wdog:
254timeout: Watchdog timeout in microseconds (max/default 8388607 or 8.3ish secs)
255-------------------------------------------------
256sbc60xxwdt:
257wdt_stop: SBC60xx WDT 'stop' io port (default 0x45)
258wdt_start: SBC60xx WDT 'start' io port (default 0x443)
259timeout: Watchdog timeout in seconds. (1<=timeout<=3600, default=30)
260nowayout: Watchdog cannot be stopped once started
261 (default=kernel config parameter)
262-------------------------------------------------
263sbc7240_wdt:
264timeout: Watchdog timeout in seconds. (1<=timeout<=255, default=30)
265nowayout: Disable watchdog when closing device file
266-------------------------------------------------
267sbc8360:
268timeout: Index into timeout table (0-63) (default=27 (60s))
269nowayout: Watchdog cannot be stopped once started
270 (default=kernel config parameter)
271-------------------------------------------------
272sbc_epx_c3:
273nowayout: Watchdog cannot be stopped once started
274 (default=kernel config parameter)
275-------------------------------------------------
276sbc_fitpc2_wdt:
277margin: Watchdog margin in seconds (default 60s)
278nowayout: Watchdog cannot be stopped once started
279-------------------------------------------------
280sc1200wdt:
281isapnp: When set to 0 driver ISA PnP support will be disabled (default=1)
282io: io port
283timeout: range is 0-255 minutes, default is 1
284nowayout: Watchdog cannot be stopped once started
285 (default=kernel config parameter)
286-------------------------------------------------
287sc520_wdt:
288timeout: Watchdog timeout in seconds. (1 <= timeout <= 3600, default=30)
289nowayout: Watchdog cannot be stopped once started
290 (default=kernel config parameter)
291-------------------------------------------------
292sch311x_wdt:
293force_id: Override the detected device ID
294therm_trip: Should a ThermTrip trigger the reset generator
295timeout: Watchdog timeout in seconds. 1<= timeout <=15300, default=60
296nowayout: Watchdog cannot be stopped once started
297 (default=kernel config parameter)
298-------------------------------------------------
299scx200_wdt:
300margin: Watchdog margin in seconds
301nowayout: Disable watchdog shutdown on close
302-------------------------------------------------
303shwdt:
304clock_division_ratio: Clock division ratio. Valid ranges are from 0x5 (1.31ms)
305 to 0x7 (5.25ms). (default=7)
306heartbeat: Watchdog heartbeat in seconds. (1 <= heartbeat <= 3600, default=30
307nowayout: Watchdog cannot be stopped once started
308 (default=kernel config parameter)
309-------------------------------------------------
310smsc37b787_wdt:
311timeout: range is 1-255 units, default is 60
312nowayout: Watchdog cannot be stopped once started
313 (default=kernel config parameter)
314-------------------------------------------------
315softdog:
316soft_margin: Watchdog soft_margin in seconds.
317 (0 < soft_margin < 65536, default=60)
318nowayout: Watchdog cannot be stopped once started
319 (default=kernel config parameter)
320soft_noboot: Softdog action, set to 1 to ignore reboots, 0 to reboot
321 (default=0)
322-------------------------------------------------
323stmp3xxx_wdt:
324heartbeat: Watchdog heartbeat period in seconds from 1 to 4194304, default 19
325-------------------------------------------------
326ts72xx_wdt:
327timeout: Watchdog timeout in seconds. (1 <= timeout <= 8, default=8)
328nowayout: Disable watchdog shutdown on close
329-------------------------------------------------
330twl4030_wdt:
331nowayout: Watchdog cannot be stopped once started
332 (default=kernel config parameter)
333-------------------------------------------------
334txx9wdt:
335timeout: Watchdog timeout in seconds. (0<timeout<N, default=60)
336nowayout: Watchdog cannot be stopped once started
337 (default=kernel config parameter)
338-------------------------------------------------
339w83627hf_wdt:
340wdt_io: w83627hf/thf WDT io port (default 0x2E)
341timeout: Watchdog timeout in seconds. 1 <= timeout <= 255, default=60.
342nowayout: Watchdog cannot be stopped once started
343 (default=kernel config parameter)
344-------------------------------------------------
345w83697hf_wdt:
346wdt_io: w83697hf/hg WDT io port (default 0x2e, 0 = autodetect)
347timeout: Watchdog timeout in seconds. 1<= timeout <=255 (default=60)
348nowayout: Watchdog cannot be stopped once started
349 (default=kernel config parameter)
350early_disable: Watchdog gets disabled at boot time (default=1)
351-------------------------------------------------
352w83697ug_wdt:
353wdt_io: w83697ug/uf WDT io port (default 0x2e)
354timeout: Watchdog timeout in seconds. 1<= timeout <=255 (default=60)
355nowayout: Watchdog cannot be stopped once started
356 (default=kernel config parameter)
357-------------------------------------------------
358w83877f_wdt:
359timeout: Watchdog timeout in seconds. (1<=timeout<=3600, default=30)
360nowayout: Watchdog cannot be stopped once started
361 (default=kernel config parameter)
362-------------------------------------------------
363w83977f_wdt:
364timeout: Watchdog timeout in seconds (15..7635), default=45)
365testmode: Watchdog testmode (1 = no reboot), default=0
366nowayout: Watchdog cannot be stopped once started
367 (default=kernel config parameter)
368-------------------------------------------------
369wafer5823wdt:
370timeout: Watchdog timeout in seconds. 1 <= timeout <= 255, default=60.
371nowayout: Watchdog cannot be stopped once started
372 (default=kernel config parameter)
373-------------------------------------------------
374wdt285:
375soft_margin: Watchdog timeout in seconds (default=60)
376-------------------------------------------------
377wdt977:
378timeout: Watchdog timeout in seconds (60..15300, default=60)
379testmode: Watchdog testmode (1 = no reboot), default=0
380nowayout: Watchdog cannot be stopped once started
381 (default=kernel config parameter)
382-------------------------------------------------
383wm831x_wdt:
384nowayout: Watchdog cannot be stopped once started
385 (default=kernel config parameter)
386-------------------------------------------------
387wm8350_wdt:
388nowayout: Watchdog cannot be stopped once started
389 (default=kernel config parameter)
390-------------------------------------------------
diff --git a/Documentation/watchdog/wdt.txt b/Documentation/watchdog/wdt.txt
index 03fd756d976..061c2e35384 100644
--- a/Documentation/watchdog/wdt.txt
+++ b/Documentation/watchdog/wdt.txt
@@ -14,14 +14,22 @@ reboot will depend on the state of the machines and interrupts. The hardware
14boards physically pull the machine down off their own onboard timers and 14boards physically pull the machine down off their own onboard timers and
15will reboot from almost anything. 15will reboot from almost anything.
16 16
17A second temperature monitoring interface is available on the WDT501P cards 17A second temperature monitoring interface is available on the WDT501P cards.
18This provides /dev/temperature. This is the machine internal temperature in 18This provides /dev/temperature. This is the machine internal temperature in
19degrees Fahrenheit. Each read returns a single byte giving the temperature. 19degrees Fahrenheit. Each read returns a single byte giving the temperature.
20 20
21The third interface logs kernel messages on additional alert events. 21The third interface logs kernel messages on additional alert events.
22 22
23The wdt card cannot be safely probed for. Instead you need to pass 23The ICS ISA-bus wdt card cannot be safely probed for. Instead you need to
24wdt=ioaddr,irq as a boot parameter - eg "wdt=0x240,11". 24pass IO address and IRQ boot parameters. E.g.:
25 wdt.io=0x240 wdt.irq=11
26
27Other "wdt" driver parameters are:
28 heartbeat Watchdog heartbeat in seconds (default 60)
29 nowayout Watchdog cannot be stopped once started (kernel
30 build parameter)
31 tachometer WDT501-P Fan Tachometer support (0=disable, default=0)
32 type WDT501-P Card type (500 or 501, default=500)
25 33
26Features 34Features
27-------- 35--------
@@ -40,4 +48,3 @@ Minor numbers are however allocated for it.
40 48
41 49
42Example Watchdog Driver: see Documentation/watchdog/src/watchdog-simple.c 50Example Watchdog Driver: see Documentation/watchdog/src/watchdog-simple.c
43