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Message-ID: <tkrat.c3c4e46842ad7e84@s5r6.in-berlin.de> 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/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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