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Randy Dunlap bfe8df3d31 slow down printk during boot 
Optionally add a boot delay after each kernel printk() call, crudely
measured in milliseconds, with a maximum delay of 10 seconds per printk.

Enable CONFIG_BOOT_PRINTK_DELAY=y and then add (e.g.):
"lpj=loops_per_jiffy boot_delay=100"
to the kernel command line.

It has been useful in cases like "during boot, my machine just reboots or the
screen goes black" by slowing down printk, (and adding initcall_debug), we can
usually see the last thing that happened before the lights went out which is
usually a valuable clue.

[akpm@linux-foundation.org: not all architectures implement CONFIG_HZ]
[akpm@linux-foundation.org: fix lots of stuff]
[bunk@stusta.de: kernel/printk.c: make 2 variables static]
[heiko.carstens@de.ibm.com: fix slow down printk on boot compile error]
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2007-10-16 09:42:49 -07:00
..
ABI USB: add power/persist device attribute 2007-07-12 16:34:30 -07:00
DocBook Merge git://git.infradead.org/mtd-2.6 2007-10-13 10:12:15 -07:00
RCU Document the fact that RCU callbacks can run in parallel 2007-07-16 09:05:47 -07:00
accounting Documentation: fix getdelays.c printf bug 2007-08-22 19:52:44 -07:00
aoe Fix typos in Documentation/: 'D'-'E' 2006-10-03 22:47:42 +02:00
arm [ARM] Add missing entries to Documentation/arm/00-INDEX 2007-10-12 23:43:32 +01:00
auxdisplay documentation: convert the Documentation directory to UTF-8 2007-05-09 08:58:19 +02:00
blackfin Blackfin arch: kgdb specific code 2007-06-29 16:35:17 +08:00
block Corrections in Documentation/block/ioprio.txt 2007-10-10 09:25:57 +02:00
cdrom remove the documentation for the legacy CDROM drivers 2007-07-16 14:39:04 +02:00
connector some kmalloc/memset ->kzalloc (tree wide) 2007-07-19 10:04:50 -07:00
console Typo: fro -> from 2007-07-19 10:04:47 -07:00
cpu-freq misc doc and kconfig typos 2007-05-09 08:58:15 +02:00
cris Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
crypto async_tx: usage documentation and developer notes (v2) 2007-09-24 10:26:25 -07:00
device-mapper dm: delay target 2007-05-09 12:30:47 -07:00
driver-model Documentation fix devres.txt: lib/iomap.c -> lib/devres.c 2007-07-18 15:49:49 -07:00
drivers/edac drivers/edac: add to edac docs 2007-07-19 10:04:57 -07:00
dvb V4L/DVB (6252): Adapt drivers to use the newer videobuf modules 2007-10-09 22:14:55 -03:00
early-userspace earlyuserspace/README: fix homonym err 2005-11-08 17:16:50 +01:00
fault-injection fault-injection: fix example scripts in documentation 2007-07-16 09:05:45 -07:00
fb pvr2fb: update Documentation/fb/pvr2fb.txt 2007-08-11 15:47:40 -07:00
filesystems Merge branch 'locks' of git://linux-nfs.org/~bfields/linux 2007-10-15 16:07:40 -07:00
firmware_class sysfs: add parameter "struct bin_attribute *" in .read/.write methods for sysfs binary attributes 2007-07-11 16:09:09 -07:00
fujitsu/frv misc doc and kconfig typos 2007-05-09 08:58:15 +02:00
hrtimer Add a flag to indicate deferrable timers in /proc/timer_stats 2007-07-16 09:05:45 -07:00
hrtimers [PATCH] hrtimers: move and add documentation 2007-02-16 08:13:58 -08:00
hwmon hwmon: (dme1737) Add sch311x support 2007-10-10 22:47:13 -04:00
i2c i2c: Rename the PEC functionality bit 2007-10-13 23:56:33 +02:00
i2o documentation: convert the Documentation directory to UTF-8 2007-05-09 08:58:19 +02:00
i386 i386: Add warning in Documentation that zero-page is not a stable ABI 2007-08-11 15:58:14 -07:00
ia64 [IA64] prevent MCA when performing MMIO mmap to PCI config space 2007-07-11 11:34:49 -07:00
infiniband IB/umad: Add P_Key index support 2007-10-09 19:59:15 -07:00
input Fix CRLF line endings in Documentation/input/iforce-protocol.txt 2007-09-20 11:33:45 -07:00
ioctl [PATCH] Document how to decode an IOCTL number 2006-12-10 09:55:40 -08:00
isdn documentation: convert the Documentation directory to UTF-8 2007-05-09 08:58:19 +02:00
ja_JP HOWTO: update ja_JP/HOWTO with latest changes 2007-10-12 14:50:59 -07:00
kbuild docs: note about select in kconfig-language.txt 2007-08-11 15:47:41 -07:00
kdump [PATCH] PPC64 Kdump documentation update 2007-02-20 17:10:15 -08:00
ko_KR HOWTO: korean translation of Documentation/HOWTO 2007-08-22 14:35:35 -07:00
lguest i386/x86_64: move headers to include/asm-x86 2007-10-11 11:20:03 +02:00
m68k more ACSI removal 2007-07-16 15:02:47 +02:00
mips [MIPS] Delete Documentation/mips/pci/pci.README 2007-05-11 14:28:30 +01:00
netlabel Fix occurrences of "the the " 2007-05-09 08:57:56 +02:00
networking Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2007-10-15 14:06:58 -07:00
parisc Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pcmcia add new_id to PCMCIA drivers 2007-05-07 12:12:50 -07:00
power Documentation:reference notifiers.txt in freezing-of-tasks.txt 2007-07-21 17:49:16 -07:00
powerpc Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2007-10-11 21:55:47 -07:00
s390 [S390] cio: Documentation update. 2007-10-12 16:13:02 +02:00
scsi [SCSI] Update Documentation/scsi/00-INDEX 2007-10-12 14:52:34 -04:00
serial [SERIAL] Update parity handling documentation 2006-06-02 17:47:26 +01:00
sh sh: SH7722 clock framework support. 2007-05-07 02:11:56 +00:00
sound [ALSA] hda-intel: support for iMac 24'' released on 09/2006 2007-07-20 11:12:00 +02:00
sparc [SPARC/64]: Prepare to remove of_platform_driver name. 2007-10-13 21:53:11 -07:00
spi spidev_test utility 2007-07-31 15:39:40 -07:00
sysctl handle kernelcore=: generic 2007-07-17 10:22:59 -07:00
telephony Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
uml Fix typos in /Documentation : 'U-Z' 2006-11-30 04:58:40 +01:00
usb USB: documentation for USB power management 2007-10-12 14:55:34 -07:00
video4linux V4L/DVB (6295): saa7134: add autodetection for KWorld ATSC-115 2007-10-10 00:03:15 -03:00
vm Document Linux Memory Policy 2007-08-22 19:52:44 -07:00
w1 [PATCH] w1: Userspace communication protocol over connector. 2006-06-22 11:22:50 -07:00
watchdog [WATCHDOG] Add a 00-INDEX file to Documentation/watchdog/ 2007-08-16 20:28:36 +00:00
x86_64 x86_64: mcelog tolerant level cleanup 2007-07-21 18:37:10 -07:00
zh_CN zh_CN/HOWTO: update URLs of git trees 2007-07-18 16:02:12 -07:00
00-INDEX Documentation: move locks.txt in filesystems/ 2007-10-09 18:32:45 -04:00
BUG-HUNTING Documentation: How to use GDB to decode OOPSes 2007-06-01 08:18:28 -07:00
Changes [x86 setup] Document grub < 0.93 as broken 2007-08-02 13:50:43 -04:00
CodingStyle dev_vdbg() documentation 2007-07-18 15:49:50 -07:00
DMA-API.txt dma_free_coherent() needs irqs enabled (sigh) 2007-10-12 15:03:15 -07:00
DMA-ISA-LPC.txt Fix typos in /Documentation : 'T'' 2006-11-30 04:55:36 +01:00
DMA-mapping.txt PCI: remove pci_dac_dma_... APIs 2007-07-11 16:02:11 -07:00
HOWTO HOWTO: latest lxr url address changed 2007-08-22 14:35:35 -07:00
IO-mapping.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
IPMI.txt [PATCH] IPMI: system interface hotplug 2006-12-07 08:39:47 -08:00
IRQ-affinity.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
IRQ.txt [PATCH] genirq: irq: document what an IRQ is 2006-06-29 10:26:25 -07:00
MSI-HOWTO.txt PCI: Remove no longer correct documentation regarding MSI vector assignment 2007-10-12 15:03:16 -07:00
ManagementStyle Fix this Paul Simon song's name 2007-09-13 08:11:10 -07:00
PCIEBUS-HOWTO.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
README.DAC960 [PATCH] devfs: Last little devfs cleanups throughout the kernel tree. 2006-06-26 12:25:09 -07:00
README.cycladesZ Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
SAK.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
SM501.txt SM501: Add Documentation/SM501.txt 2007-06-24 08:59:11 -07:00
SecurityBugs Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
SubmitChecklist SubmitChecklist update, fix spelling error 2007-07-16 09:05:46 -07:00
SubmittingDrivers Documentation: Ask driver writers to provide PM support 2007-05-08 11:14:59 -07:00
SubmittingPatches fix typo in Documentation/SubmittingPatches 2007-09-11 17:21:20 -07:00
VGA-softcursor.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
applying-patches.txt [PATCH] Docs update: typos, corrections and additions to applying-patches.txt 2006-01-10 08:01:54 -08:00
atomic_ops.txt Documentation/atomic_ops.txt typo fix 2007-06-08 17:23:33 -07:00
basic_profiling.txt [PATCH] oprofile: report anonymous region samples 2005-06-24 00:06:27 -07:00
binfmt_misc.txt documentation: convert the Documentation directory to UTF-8 2007-05-09 08:58:19 +02:00
cachetlb.txt [POWERPC] unmap_vm_area becomes unmap_kernel_range for the public 2007-06-14 22:29:56 +10:00
cciss.txt Documentation: cciss: detecting failed drives 2007-05-08 11:15:10 -07:00
cli-sti-removal.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
computone.txt remove mentionings of devfs in documentation 2006-10-03 22:17:48 +02:00
cpqarray.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cpu-hotplug.txt Add suspend-related notifications for CPU hotplug 2007-05-09 12:30:56 -07:00
cpu-load.txt [PATCH] Documentation: CPU load calculation description 2007-03-01 14:53:39 -08:00
cpusets.txt [PATCH] CPUSETS: add mems to basic usage documentation 2007-04-02 10:06:08 -07:00
cputopology.txt Fix typos in Documentation/: 'D'-'E' 2006-10-03 22:47:42 +02:00
dcdbas.txt [PATCH] dcdbas: add Dell Systems Management Base Driver with sysfs support 2005-09-07 16:57:27 -07:00
debugging-modules.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dell_rbu.txt Fix typos in Documentation/: 'N'-'P' 2006-10-03 22:52:05 +02:00
devices.txt Add /dev/oldmem to devices.txt documentation 2007-10-01 07:52:23 -07:00
digiepca.txt typo fixes: aquire -> acquire 2006-06-30 18:23:04 +02:00
dnotify.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dontdiff update dontdiff file 2007-07-31 15:39:36 -07:00
eisa.txt Fix typos in /Documentation : 'U-Z' 2006-11-30 04:58:40 +01:00
exception.txt Documentation: remove duplicated words 2006-10-03 22:57:56 +02:00
feature-removal-schedule.txt Input: remove tsdev interface 2007-10-13 00:38:52 -04:00
floppy.txt [PATCH] kernel Doc/ URL corrections 2005-11-22 09:14:30 -08:00
gpio.txt minor gpio doc update 2007-07-24 12:24:59 -07:00
hayes-esp.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
highuid.txt Fix "can not" in Documentation and Kconfig 2006-10-03 22:53:09 +02:00
hpet.txt hpet.txt: broken link fix 2007-07-31 15:39:42 -07:00
hw_random.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ide.txt ide: make legacy IDE VLB modules check for the "probe" kernel params (v2) 2007-03-03 17:48:55 +01:00
initrd.txt documentation: Documentation/initrd.txt 2007-05-23 20:14:14 -07:00
io_ordering.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ioctl-number.txt Remove the last few UMSDOS leftovers 2007-07-16 09:05:51 -07:00
iostats.txt [BLOCK] Get rid of request_queue_t typedef 2007-07-24 09:28:11 +02:00
irqflags-tracing.txt [PATCH] lockdep: irqtrace subsystem, docs 2006-07-03 15:27:03 -07:00
isapnp.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
java.txt documentation: convert the Documentation directory to UTF-8 2007-05-09 08:58:19 +02:00
kernel-doc-nano-HOWTO.txt [PATCH] Discuss a couple common errors in kernel-doc usage. 2007-02-11 10:51:32 -08:00
kernel-docs.txt documentation: convert the Documentation directory to UTF-8 2007-05-09 08:58:19 +02:00
kernel-parameters.txt slow down printk during boot 2007-10-16 09:42:49 -07:00
keys-request-key.txt [PATCH] Keys: Allow in-kernel key requestor to pass auxiliary data to upcaller 2006-06-29 10:26:20 -07:00
keys.txt Fix a typo in Documentation/keys.txt 2007-07-31 15:39:39 -07:00
kobject.txt driver core: remove subsystem_init() 2007-10-12 14:51:11 -07:00
kprobes.txt jprobes: remove JPROBE_ENTRY() 2007-07-19 10:04:44 -07:00
kref.txt Fix wrong identifier name in Documentation/kref.txt 2007-05-11 19:07:14 +02:00
laptop-mode.txt laptop-mode URL update 2007-05-08 11:15:14 -07:00
ldm.txt LDM: Fix for Windows Vista dynamic disks 2007-05-21 09:58:40 -07:00
leds-class.txt [PATCH] LED: class documentation 2006-03-31 12:18:56 -08:00
local_ops.txt [PATCH] local_t: Documentation 2007-02-11 10:51:32 -08:00
lockdep-design.txt [PATCH] fix lockdep-design.txt 2006-10-11 11:14:24 -07:00
lockstat.txt lockstat: documentation 2007-10-07 16:28:43 -07:00
logo.gif Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
logo.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
magic-number.txt Magic number prefix consistency change to Documentation/magic-number.txt 2007-05-09 08:58:18 +02:00
mca.txt Fix some typos in Documentation/: 'A' 2006-10-03 22:45:33 +02:00
md.txt md: allow reshape_position for md arrays to be set via sysfs 2007-05-09 12:30:57 -07:00
memory-barriers.txt Documentation/memory-barriers.txt: various fixes 2007-05-23 20:14:15 -07:00
memory-hotplug.txt Memory hotplug document 2007-08-11 15:47:41 -07:00
memory.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mono.txt Fix "can not" in Documentation and Kconfig 2006-10-03 22:53:09 +02:00
moxa-smartio Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mtrr.txt [PATCH] Doc: fix mtrr userspace programs to build cleanly 2006-04-11 06:18:44 -07:00
mutex-design.txt [PATCH] mutex subsystem, documentation 2006-01-09 15:59:20 -08:00
nbd.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
nfsroot.txt [PATCH] fix the defaults mentioned in Documentation/nfsroot.txt 2007-02-12 09:48:28 -08:00
nmi_watchdog.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
nommu-mmap.txt [PATCH] NOMMU: Make futexes work under NOMMU conditions 2006-09-27 08:26:15 -07:00
numastat.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
oops-tracing.txt Report that kernel is tainted if there was an OOPS 2007-07-17 10:23:02 -07:00
paride.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
parport-lowlevel.txt [PATCH] parport: fix documentation 2006-02-03 08:32:06 -08:00
parport.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pci-error-recovery.txt Documentation: remove duplicated words 2006-10-03 22:57:56 +02:00
pci.txt PCI: add pci_try_set_mwi 2007-07-11 16:02:11 -07:00
pcieaer-howto.txt documentation: convert the Documentation directory to UTF-8 2007-05-09 08:58:19 +02:00
pi-futex.txt fix a typo in Documentation/pi-futex.txt 2006-10-03 23:39:02 +02:00
pm.txt Fix "can not" in Documentation and Kconfig 2006-10-03 22:53:09 +02:00
pnp.txt misc doc and kconfig typos 2007-05-09 08:58:15 +02:00
power_supply_class.txt [BATTERY] Universal power supply class (was: battery class) 2007-07-10 11:25:44 +01:00
preempt-locking.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
prio_tree.txt Documentation: remove duplicated words 2006-10-03 22:57:56 +02:00
ramdisk.txt [PATCH] Update ramdisk documentation 2006-07-14 21:53:53 -07:00
rbtree.txt [PATCH] Documentation/rbtree.txt 2007-02-11 10:51:35 -08:00
rfkill.txt [RFKILL]: Add rfkill documentation 2007-10-10 16:49:24 -07:00
riscom8.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
robust-futex-ABI.txt Fix typos in /Documentation : 'U-Z' 2006-11-30 04:58:40 +01:00
robust-futexes.txt Fix typos in /Documentation : Misc 2006-11-30 05:21:10 +01:00
rocket.txt Fix typos in Documentation/: 'S' 2006-10-03 22:55:17 +02:00
rpc-cache.txt Documentation: remove duplicated words 2006-10-03 22:57:56 +02:00
rt-mutex-design.txt [PATCH] typo fixes for rt-mutex-design.txt 2006-10-01 00:39:24 -07:00
rt-mutex.txt [PATCH] pi-futex: rt mutex docs 2006-06-27 17:32:47 -07:00
rtc.txt rtc: make example code jump to done instead of return when ioctl not supported 2007-07-17 10:23:08 -07:00
sched-arch.txt [PATCH] sched: resched and cpu_idle rework 2005-11-09 07:56:33 -08:00
sched-coding.txt Fix typos in Documentation/: 'H'-'M' 2006-10-03 22:50:39 +02:00
sched-design-CFS.txt sched: group scheduling, sysfs tunables 2007-10-15 17:00:14 +02:00
sched-design.txt Fix typos in Documentation/: 'H'-'M' 2006-10-03 22:50:39 +02:00
sched-domains.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sched-nice-design.txt sched: document nice levels 2007-08-09 11:16:46 +02:00
sched-stats.txt [PATCH] sched: update Documentation/sched-stats.txt 2007-07-26 13:40:43 +02:00
serial-console.txt [PATCH] doc: more serial-console info 2006-03-25 08:23:00 -08:00
sgi-ioc4.txt [PATCH] ioc4: Core driver rewrite 2005-06-21 18:46:32 -07:00
sgi-visws.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sharedsubtree.txt Fix typos in /Documentation : 'T'' 2006-11-30 04:55:36 +01:00
smart-config.txt kbuild: remove checkconfig.pl 2006-02-19 09:51:22 +01:00
smp.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sony-laptop.txt sony-laptop: update documentation and Kconfig help 2007-04-10 16:01:19 -04:00
sonypi.txt documentation: convert the Documentation directory to UTF-8 2007-05-09 08:58:19 +02:00
sparse.txt [PATCH] update 'getting sparse' info. 2007-03-08 16:47:58 -08:00
specialix.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
spinlocks.txt docs: static initialization of spinlocks is OK 2007-07-16 09:05:52 -07:00
stable_api_nonsense.txt stable_api_nonsense.txt: Disambiguate the use of "this" by using "that" to refer to the syscall interface 2007-07-30 14:25:12 -07:00
stable_kernel_rules.txt Fix typos in /Documentation : Misc 2006-11-30 05:21:10 +01:00
stallion.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
svga.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sx.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sysfs-rules.txt Fix Doc/sysfs-rules typos 2007-07-30 14:25:12 -07:00
sysrq.txt sysrq docs: document sequence that actually works 2007-10-07 16:28:43 -07:00
thinkpad-acpi.txt ACPI: thinkpad-acpi: bump up version to 0.16 2007-09-17 00:58:31 -04:00
tipar.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
tty.txt tty: Clarify documentation of ->write() 2007-05-08 11:14:59 -07:00
unicode.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
unshare.txt Documentation: remove duplicated words 2006-10-03 22:57:56 +02:00
video-output.txt output: Add output class document 2006-12-20 01:46:58 -05:00
volatile-considered-harmful.txt "volatile considered harmful" 2007-06-24 08:59:11 -07:00
voyager.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
xterm-linux.xpm Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
zorro.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00

README.cycladesZ 

The Cyclades-Z must have firmware loaded onto the card before it will
operate.  This operation should be performed during system startup,

The firmware, loader program and the latest device driver code are
available from Cyclades at
    ftp://ftp.cyclades.com/pub/cyclades/cyclades-z/linux/