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authorLubomir Rintel <lkundrak@v3.sk>2013-12-22 11:31:41 +0100
committerStefan Richter <stefanr@s5r6.in-berlin.de>2014-01-12 18:54:38 +0100
commita9954ce769e2c8b450b00ab2a4e208f447996b2d (patch)
tree6305ff7464f03effbc8b3b1b2568b4cad4990aee /Documentation/debugging-via-ohci1394.txt
parent7e22e91102c6b9df7c4ae2168910e19d2bb14cd6 (diff)
downloadlinux-a9954ce769e2c8b450b00ab2a4e208f447996b2d.tar.bz2
Documentation/: update FireWire debugging documentation
The old firewire stack is long dead now and a new version firescope has been released with support for current kernels. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Cc: Rob Landley <rob@landley.net> Cc: Justin P. Mattock <justinmattock@gmail.com> Cc: Bernhard Kaindl <bk@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'Documentation/debugging-via-ohci1394.txt')
-rw-r--r--Documentation/debugging-via-ohci1394.txt24
1 files changed, 9 insertions, 15 deletions
diff --git a/Documentation/debugging-via-ohci1394.txt b/Documentation/debugging-via-ohci1394.txt
index 611f5a5499b1..14d194496490 100644
--- a/Documentation/debugging-via-ohci1394.txt
+++ b/Documentation/debugging-via-ohci1394.txt
@@ -36,17 +36,13 @@ available (notebooks) or too slow for extensive debug information (like ACPI).
Drivers
-------
-The ohci1394 driver in drivers/ieee1394 initializes the OHCI-1394 controllers
-to a working state and enables physical DMA by default for all remote nodes.
-This can be turned off by ohci1394's module parameter phys_dma=0.
-
-The alternative firewire-ohci driver in drivers/firewire uses filtered physical
+The firewire-ohci driver in drivers/firewire uses filtered physical
DMA by default, which is more secure but not suitable for remote debugging.
Compile the driver with CONFIG_FIREWIRE_OHCI_REMOTE_DMA (Kernel hacking menu:
Remote debugging over FireWire with firewire-ohci) to get unfiltered physical
DMA.
-Because ohci1394 and firewire-ohci depend on the PCI enumeration to be
+Because the firewire-ohci driver depends on the PCI enumeration to be
completed, an initialization routine which runs pretty early has been
implemented for x86. This routine runs long before console_init() can be
called, i.e. before the printk buffer appears on the console.
@@ -64,7 +60,7 @@ be used to view the printk buffer of a remote machine, even with live update.
Bernhard Kaindl enhanced firescope to support accessing 64-bit machines
from 32-bit firescope and vice versa:
-- http://halobates.de/firewire/firescope-0.2.2.tar.bz2
+- http://v3.sk/~lkundrak/firescope/
and he implemented fast system dump (alpha version - read README.txt):
- http://halobates.de/firewire/firedump-0.1.tar.bz2
@@ -92,11 +88,11 @@ Step-by-step instructions for using firescope with early OHCI initialization:
1) Verify that your hardware is supported:
- Load the ohci1394 or the fw-ohci module and check your kernel logs.
+ Load the firewire-ohci module and check your kernel logs.
You should see a line similar to
- ohci1394: fw-host0: OHCI-1394 1.1 (PCI): IRQ=[18] MMIO=[fe9ff800-fe9fffff]
- ... Max Packet=[2048] IR/IT contexts=[4/8]
+ firewire_ohci 0000:15:00.1: added OHCI v1.0 device as card 2, 4 IR + 4 IT
+ ... contexts, quirks 0x11
when loading the driver. If you have no supported controller, many PCI,
CardBus and even some Express cards which are fully compliant to OHCI-1394
@@ -113,20 +109,18 @@ Step-by-step instructions for using firescope with early OHCI initialization:
If an driver is running on both machines you should see a line like
- ieee1394: Node added: ID:BUS[0-01:1023] GUID[0090270001b84bba]
+ firewire_core 0000:15:00.1: created device fw1: GUID 00061b0020105917, S400
on both machines in the kernel log when the cable is plugged in
and connects the two machines.
3) Test physical DMA using firescope:
- On the debug host,
- - load the raw1394 module,
- - make sure that /dev/raw1394 is accessible,
+ On the debug host, make sure that /dev/fw* is accessible,
then start firescope:
$ firescope
- Port 0 (ohci1394) opened, 2 nodes detected
+ Port 0 (/dev/fw1) opened, 2 nodes detected
FireScope
---------