linux-kernel - [PATCH] Documentation: correction to debugging-via-ohci1394

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Date:	Mon, 18 Feb 2008 19:40:09 +0100 (CET)
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux-kernel@...r.kernel.org
cc:	linux1394-devel@...ts.sourceforge.net,
	Bernhard Kaindl <bk@...e.de>, Ingo Molnar <mingo@...e.hu>
Subject: [PATCH] Documentation: correction to debugging-via-ohci1394

Rectify a factoid about firewire-ohci.

Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
---
Ingo, I can get this to Linus via linux1394-2.6.git.

 Documentation/debugging-via-ohci1394.txt |   13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

Index: linux-2.6.25-rc2/Documentation/debugging-via-ohci1394.txt
===================================================================
--- linux-2.6.25-rc2.orig/Documentation/debugging-via-ohci1394.txt
+++ linux-2.6.25-rc2/Documentation/debugging-via-ohci1394.txt
@@ -36,13 +36,14 @@ available (notebooks) or too slow for ex
 Drivers
 -------
 
-The OHCI-1394 drivers in drivers/firewire and drivers/ieee1394 initialize
-the OHCI-1394 controllers to a working state and can be used to enable
-physical DMA. By default you only have to load the driver, and physical
-DMA access will be granted to all remote nodes, but it can be turned off
-when using the ohci1394 driver.
+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.
 
-Because these drivers depend on the PCI enumeration to be completed, an
+The alternative firewire-ohci driver in drivers/firewire uses filtered physical
+DMA, hence is not yet suitable for remote debugging.
+
+Because ohci1394 depends on the PCI enumeration to be completed, an
 initialization routine which can runs pretty early (long before console_init(),
 which makes the printk buffer appear on the console can be called) was written.
 

-- 
Stefan Richter
-=====-==--- --=- =--=-
http://arcgraph.de/sr/

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