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Bernhard Kaindl f212ec4b7b x86: early boot debugging via FireWire (ohci1394_dma=early) 
This patch adds a new configuration option, which adds support for a new
early_param which gets checked in arch/x86/kernel/setup_{32,64}.c:setup_arch()
to decide wether OHCI-1394 FireWire controllers should be initialized and
enabled for physical DMA access to allow remote debugging of early problems
like issues ACPI or other subsystems which are executed very early.

If the config option is not enabled, no code is changed, and if the boot
paramenter is not given, no new code is executed, and independent of that,
all new code is freed after boot, so the config option can be even enabled
in standard, non-debug kernels.

With specialized tools, it is then possible to get debugging information
from machines which have no serial ports (notebooks) such as the printk
buffer contents, or any data which can be referenced from global pointers,
if it is stored below the 4GB limit and even memory dumps of of the physical
RAM region below the 4GB limit can be taken without any cooperation from the
CPU of the host, so the machine can be crashed early, it does not matter.

In the extreme, even kernel debuggers can be accessed in this way. I wrote
a small kgdb module and an accompanying gdb stub for FireWire which allows
to gdb to talk to kgdb using remote remory reads and writes over FireWire.

An version of the gdb stub fore FireWire is able to read all global data
from a system which is running a a normal kernel without any kernel debugger,
without any interruption or support of the system's CPU. That way, e.g. the
task struct and so on can be read and even manipulated when the physical DMA
access is granted.

A HOWTO is included in this patch, in Documentation/debugging-via-ohci1394.txt
and I've put a copy online at
ftp://ftp.suse.de/private/bk/firewire/docs/debugging-via-ohci1394.txt

It also has links to all the tools which are available to make use of it
another copy of it is online at:
ftp://ftp.suse.de/private/bk/firewire/kernel/ohci1394_dma_early-v2.diff

Signed-Off-By: Bernhard Kaindl <bk@suse.de>
Tested-By: Thomas Renninger <trenn@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
 		2008-01-30 13:34:11 +01:00
..
ABI Add Documentation for FAIR_USER_SCHED sysfs files 2007-12-17 10:33:19 -08:00
DocBook [S390] cio: Extend adapter interrupt interface. 2008-01-26 14:11:00 +01:00
RCU Preempt-RCU: update RCU Documentation. 2008-01-25 21:08:25 +01:00
accounting make getdelays cgroupstats aware 2007-11-14 18:45:38 -08:00
aoe Fix typos in Documentation/: 'D'-'E' 2006-10-03 22:47:42 +02:00
arm typo fixes 2007-10-20 01:34:40 +02:00
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 Add Documentation/block/00-INDEX 2007-10-16 10:11:28 +02:00
cdrom Convert files to UTF-8 and some cleanups 2007-10-19 23:21:04 +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 [ARM] pxa: add cpufreq support 2008-01-26 15:07:52 +00:00
cris
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crypto [CRYPTO] doc: Update api-intro.txt 2008-01-11 08:16:14 +11:00
device-mapper dm: uevent generate events 2007-10-20 02:01:26 +01:00
driver-model typo fixes 2007-10-20 01:34:40 +02:00
drivers/edac drivers/edac: add to edac docs 2007-07-19 10:04:57 -07:00
dvb V4L/DVB (7077): bt878: remove handcrafted PCI subsystem ID check 2008-01-25 19:05:22 -02:00
early-userspace docs: ramdisk/initrd/initramfs corrections 2007-10-17 08:42:56 -07:00
fault-injection fault-injection: fix example scripts in documentation 2007-07-16 09:05:45 -07:00
fb typo fixes 2007-10-20 01:34:40 +02:00
filesystems ext4: Add multi block allocator for ext4 2008-01-29 00:19:52 -05:00
firmware_class doc firmware_sample_firmware_class.c: kmalloc + memset conversion to kzalloc 2007-10-17 08:42:50 -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: Add power meter spec to Documentation/hwmon/sysfs-interface 2007-11-08 08:42:45 -05:00
i2c i2c-viapro: Add support for the VT8237S 2008-01-27 18:14:51 +01:00
i2o documentation: convert the Documentation directory to UTF-8 2007-05-09 08:58:19 +02:00
i386 x86 boot: document for 32 bit boot protocol 2007-10-30 00:22:22 +01:00
ia64 typo fixes 2007-10-20 01:34:40 +02:00
infiniband IB/umad: Add P_Key index support 2007-10-09 19:59:15 -07:00
input typo fixes 2007-10-20 01:34:40 +02:00
ioctl [PATCH] Document how to decode an IOCTL number 2006-12-10 09:55:40 -08:00
isdn spelling fixes: Documentation/ 2007-10-20 01:30:25 +02:00
ja_JP HOWTO: Change man-page maintainer address for Japanese HOWTO 2007-12-17 10:33:18 -08:00
kbuild kconfig: document use of HAVE_* 2008-01-28 23:21:19 +01:00
kdump Add documentation for extended crashkernel syntax 2007-10-19 11:53:51 -07:00
ko_KR HOWTO: update misspelling and word incorrected 2007-12-17 10:33:19 -08:00
lguest Fix lguest documentation 2007-12-17 19:28:16 -08:00
m68k [SCSI] 53c7xx: fix removal fallout 2008-01-11 18:22:30 -06:00
make Documentation/make/headers_install.txt 2007-10-17 08:43:05 -07:00
mips [MIPS] remove Documentation/mips/GT64120.README 2008-01-29 10:15:05 +00:00
namespaces The namespaces compatibility list doc 2007-11-29 09:24:53 -08:00
netlabel Fix occurrences of "the the " 2007-05-09 08:57:56 +02:00
networking [BONDING]: Documentation update 2008-01-28 15:03:48 -08:00
parisc
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pcmcia add new_id to PCMCIA drivers 2007-05-07 12:12:50 -07:00
power typo fixes 2007-10-20 01:34:40 +02:00
powerpc [POWERPC] Document rgmii-rxid and rgmii-txid phy-connection-types 2007-11-19 22:09:16 -06:00
s390 [S390] cio: Dump ccw device information in case of timeout. 2008-01-26 14:10:55 +01:00
scsi [SCSI] aacraid: add Voodoo Lite class of cards. 2008-01-23 11:29:34 -06:00
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 typo fixes 2007-10-20 01:34:40 +02:00
sparc [SPARC/64]: Prepare to remove of_platform_driver name. 2007-10-13 21:53:11 -07:00
spi Convert files to UTF-8 and some cleanups 2007-10-19 23:21:04 +02:00
sysctl Documentation: update hugetlb information 2007-12-17 19:28:17 -08:00
telephony Add a 00-INDEX file to Documentation/telephony/ 2007-10-17 08:43:05 -07:00
uml Fix typos in /Documentation : 'U-Z' 2006-11-30 04:58:40 +01:00
usb USB: power-management documenation update 2007-11-28 13:58:34 -08:00
video4linux V4L/DVB (7043): New card supported(partially): Pinnacle 800i 2008-01-25 19:05:06 -02:00
vm kset: move /sys/slab to /sys/kernel/slab 2008-01-24 20:40:16 -08:00
w1 Add Documentation/{w1,w1/masters}/00-INDEX 2007-10-17 08:43:06 -07:00
watchdog [WATCHDOG] clarify watchdog operation in documentation 2008-01-18 21:23:05 +00:00
x86_64 x86: 32-bit EFI runtime service support: fixes in sync with 64-bit support 2008-01-30 13:32:11 +01:00
zh_CN Chinese: add translation of Codingstyle 2008-01-24 20:40:04 -08:00
00-INDEX The namespaces compatibility list doc 2007-11-29 09:24:53 -08:00
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 CodingStyle: relax the 80-cole rule 2007-10-17 08:42:55 -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 Update DMA-mapping documentation 2007-10-17 08:43:06 -07:00
HOWTO Change man-pages maintainer address 2007-10-17 08:43:01 -07:00
IO-mapping.txt
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IPMI.txt IPMI: new NMI handling 2007-10-18 14:37:32 -07:00
IRQ-affinity.txt
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IRQ.txt [PATCH] genirq: irq: document what an IRQ is 2006-06-29 10:26:25 -07:00
Intel-IOMMU.txt Intel IOMMU: Iommu Gfx workaround 2007-10-22 08:13:19 -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
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README.DAC960 [PATCH] devfs: Last little devfs cleanups throughout the kernel tree. 2006-06-26 12:25:09 -07:00
README.cycladesZ
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SAK.txt
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SM501.txt Tweak Documentation/SM501.txt 2007-10-17 08:43:06 -07:00
SecurityBugs
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SubmitChecklist Documentation: Fix typo in SubmitChecklist. 2007-10-20 03:13:09 +02:00
SubmittingDrivers Update 2.4 maintainer in document 2007-10-20 02:02:12 +02:00
SubmittingPatches fix typo in SubmittingPatches 2007-10-30 21:52:33 -07:00
VGA-softcursor.txt
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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 bitops: introduce lock ops 2007-10-18 14:37:29 -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 remove unused flush_tlb_pgtables 2007-10-19 11:53:34 -07:00
cciss.txt Documentation: cciss: detecting failed drives 2007-05-08 11:15:10 -07:00
cgroups.txt Task Control Groups: shared cgroup subsystem group arrays 2007-10-19 11:53:36 -07:00
cli-sti-removal.txt
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computone.txt remove mentionings of devfs in documentation 2006-10-03 22:17:48 +02:00
cpqarray.txt
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cpu-hotplug.txt [S390] Get rid of additional_cpus kernel parameter. 2008-01-26 14:11:15 +01:00
cpu-load.txt [PATCH] Documentation: CPU load calculation description 2007-03-01 14:53:39 -08:00
cpusets.txt cpuset sched_load_balance flag 2007-10-19 11:53:41 -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
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debugging-via-ohci1394.txt x86: early boot debugging via FireWire (ohci1394_dma=early) 2008-01-30 13:34:11 +01:00
dell_rbu.txt Fix typos in Documentation/: 'N'-'P' 2006-10-03 22:52:05 +02:00
devices.txt typo fixes 2007-10-20 01:34:40 +02:00
digiepca.txt typo fixes: aquire -> acquire 2006-06-30 18:23:04 +02:00
dnotify.txt
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dontdiff [SCSI] 53c7xx: fix removal fallout 2008-01-11 18:22:30 -06:00
eisa.txt Fix typos in /Documentation : 'U-Z' 2006-11-30 04:58:40 +01:00
email-clients.txt doc: about email clients for Linux patches 2007-10-17 08:42:57 -07:00
exception.txt Documentation: remove duplicated words 2006-10-03 22:57:56 +02:00
feature-removal-schedule.txt b43: Add support for new firmware 2008-01-28 15:09:50 -08:00
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
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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
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ide.txt ide: remove broken disk byte-swapping support 2008-01-26 20:13:09 +01:00
initrd.txt docs: ramdisk/initrd/initramfs corrections 2007-10-17 08:42:56 -07:00
io_ordering.txt
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ioctl-number.txt ocfs2: Reserve ioctl range 2008-01-25 14:48:57 -08:00
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
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java.txt Documentation/java.txt: typo and grammar fixes 2007-10-20 02:37:21 +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 typo fixes 2007-10-20 01:34:40 +02:00
kernel-parameters.txt x86: GEODE add the "mfgptfix" boot time option to fix MFGPT timers 2008-01-30 13:33:33 +01:00
keys-request-key.txt KEYS: Make request_key() and co fundamentally asynchronous 2007-10-17 08:42:57 -07:00
keys.txt KEYS: Make request_key() and co fundamentally asynchronous 2007-10-17 08:42:57 -07:00
kobject.txt kobject: update the kobject/kset documentation 2008-01-24 20:40:41 -08:00
kprobes.txt ARM kprobes: let's enable it 2008-01-26 15:25:17 +00:00
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 Revert "local_t Documentation update" 2008-01-17 15:38:59 -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
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logo.txt
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magic-number.txt Magic number prefix consistency change to Documentation/magic-number.txt 2007-05-09 08:58:18 +02:00
markers.txt Linux Kernel Markers: document format string 2007-11-14 18:45:40 -08:00
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 bitops: introduce lock ops 2007-10-18 14:37:29 -07:00
memory-hotplug.txt memory hotplug: document the memory hotplug notifier 2007-10-22 08:13:17 -07:00
memory.txt
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mono.txt Fix "can not" in Documentation and Kconfig 2006-10-03 22:53:09 +02:00
moxa-smartio
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mtrr.txt [PATCH] Doc: fix mtrr userspace programs to build cleanly 2006-04-11 06:18:44 -07:00
mutex-design.txt Documentation: Add nested versions of mutex locks to docs 2007-10-20 00:15:26 +02:00
nbd.txt
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nfsroot.txt [IPV4] ipconfig: Fix regression in ip command line processing 2008-01-08 23:29:58 -08:00
nmi_watchdog.txt
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nommu-mmap.txt [PATCH] NOMMU: Make futexes work under NOMMU conditions 2006-09-27 08:26:15 -07:00
numastat.txt
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oops-tracing.txt Report that kernel is tainted if there was an OOPS 2007-07-17 10:23:02 -07:00
paride.txt
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parport-lowlevel.txt plip: fix parport_register_device name parameter 2007-11-26 19:39:01 -08:00
parport.txt
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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 Documentation: Replace obsolete "driverfs" with "sysfs". 2008-01-24 20:40:04 -08:00
power_supply_class.txt [BATTERY] Universal power supply class (was: battery class) 2007-07-10 11:25:44 +01:00
preempt-locking.txt
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prio_tree.txt Documentation: remove duplicated words 2006-10-03 22:57:56 +02:00
ramdisk.txt Remove final traces of long-deprecated "ramdisk" kernel parm 2007-10-17 08:42:56 -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
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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: tweak driver documentation for rtc periodic 2007-11-14 18:45:37 -08:00
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
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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
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sharedsubtree.txt Fix compiler warning in smount example program from sharedsubtree.txt 2007-10-20 02:44:34 +02:00
smart-config.txt kbuild: remove checkconfig.pl 2006-02-19 09:51:22 +01:00
smp.txt
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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
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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
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svga.txt
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sx.txt
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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 0.17 2007-11-05 13:07:11 -05:00
tty.txt termios: document callback more clearly 2007-11-29 09:24:52 -08:00
unicode.txt
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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
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zorro.txt
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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/