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authorStefan Richter <stefanr@s5r6.in-berlin.de>2008-02-28 22:54:43 +0300
committerStefan Richter <stefanr@s5r6.in-berlin.de>2008-04-18 19:55:33 +0400
commit080de8c2c57e3199eee837fe8b6d35a43679f8c1 (patch)
treeb376f9ce74db61393ef1cb62e9663c71f0ba45b9 /Documentation
parent17cff9ff871bb5081cade4f99a9e9382b9f1c01c (diff)
downloadlinux-080de8c2c57e3199eee837fe8b6d35a43679f8c1.tar.xz
firewire: fw-ohci: add option for remote debugging
This way firewire-ohci can be used for remote debugging like ohci1394. Version with amendment from Fri, 11 Apr 2008 00:08:08 +0200. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Acked-by: Bernhard Kaindl <bk@suse.de>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/debugging-via-ohci1394.txt16
1 files changed, 10 insertions, 6 deletions
diff --git a/Documentation/debugging-via-ohci1394.txt b/Documentation/debugging-via-ohci1394.txt
index c360d4e91b48..59a91e5c6909 100644
--- a/Documentation/debugging-via-ohci1394.txt
+++ b/Documentation/debugging-via-ohci1394.txt
@@ -41,15 +41,19 @@ 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
-DMA, hence is not yet suitable for remote debugging.
+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 depends on the PCI enumeration to be completed, an
-initialization routine which runs pretty early (long before console_init()
-which makes the printk buffer appear on the console can be called) was written.
+Because ohci1394 and firewire-ohci depend 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.
To activate it, enable CONFIG_PROVIDE_OHCI1394_DMA_INIT (Kernel hacking menu:
-Provide code for enabling DMA over FireWire early on boot) and pass the
-parameter "ohci1394_dma=early" to the recompiled kernel on boot.
+Remote debugging over FireWire early on boot) and pass the parameter
+"ohci1394_dma=early" to the recompiled kernel on boot.
Tools
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