Linux Kernel Mailing List
Tue, 26 Feb 2008 09:02:09 -0800
Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=09d7328e62e3b4cefe4bf3eeeeacb54f62a7ae5c Commit: 09d7328e62e3b4cefe4bf3eeeeacb54f62a7ae5c Parent: ef774c16a744f130f27c654bf9c4806e767fc773 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
b/Documentation/debugging-via-ohci1394.txt
index de4804e..c360d4e 100644
--- a/Documentation/debugging-via-ohci1394.txt
+++ b/Documentation/debugging-via-ohci1394.txt
@@ -36,14 +36,15 @@ available (notebooks) or too slow for extensive debug
information (like ACPI).
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.
-
-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:
-
To unsubscribe from this list: send the line "unsubscribe git-commits-head" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html