Author: Stefan Richter <[EMAIL PROTECTED]>
AuthorDate: Mon Feb 18 21:38:35 2008 +0100
Committer: Stefan Richter <[EMAIL PROTECTED]>
CommitDate: Tue Feb 19 19:57:24 2008 +0100
Documentation: correction to debugging-via-ohci1394
Rectify a factoid about firewire-ohci.
Acked-by: Ingo Molnar <[EMAIL PROTECTED]>
Also fix a typo spotted by Bernhard Kaindl.
Signed-off-by: Stefan Richter <[EMAIL PROTECTED]>
Documentation/debugging-via-ohci1394.txt | 17 +++++++++--------
1 files changed, 9 insertions(+), 8 deletions(-)
diff --git a/Documentation/debugging-via-ohci1394.txt
index de4804e..c360d4e 100644
@@ -36,14 +36,15 @@ available (notebooks) or too slow for extensive debug
information (like ACPI).
-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.
-Because these drivers depend on the PCI enumeration to be completed, an
-initialization routine which can runs pretty early (long before console_init(),
+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
+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:
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