Date: Mon, 18 Feb 2008 21:38:35 +0100 From: Stefan Richter Subject: Documentation: correction to debugging-via-ohci1394 Rectify a factoid about firewire-ohci. Acked-by: Ingo Molnar Also fix a typo spotted by Bernhard Kaindl. Signed-off-by: Stefan Richter --- Documentation/debugging-via-ohci1394.txt | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 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 @@ -36,14 +36,15 @@ 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 -initialization routine which can runs pretty early (long before console_init(), +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 runs pretty early (long before console_init() which makes the printk buffer appear on the console can be called) was written. To activate it, enable CONFIG_PROVIDE_OHCI1394_DMA_INIT (Kernel hacking menu: