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firewire: fw-ohci: add option for remote debugging

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This way firewire-ohci can be used for remote debugging like ohci1394.
Version with amendment from Fri, 11 Apr 2008 00:08:08 +0200.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Acked-by: Bernhard Kaindl <bk@suse.de>
This commit is contained in:
Stefan Richter
2008-02-28 20:54:43 +01:00
parent 17cff9ff87
commit 080de8c2c5
3 changed files with 31 additions and 7 deletions
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Documentation/debugging-via-ohci1394.txt
+10 -6
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@@ -41,15 +41,19 @@ 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.
DMA by default, which is more secure but not suitable for remote debugging.
Compile the driver with CONFIG_FIREWIRE_OHCI_REMOTE_DMA (Kernel hacking menu:
Remote debugging over FireWire with firewire-ohci) to get unfiltered physical
DMA.
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.
Because ohci1394 and firewire-ohci depend on the PCI enumeration to be
completed, an initialization routine which runs pretty early has been
implemented for x86. This routine runs long before console_init() can be
called, i.e. before the printk buffer appears on the console.
To activate it, enable CONFIG_PROVIDE_OHCI1394_DMA_INIT (Kernel hacking menu:
Provide code for enabling DMA over FireWire early on boot) and pass the
parameter "ohci1394_dma=early" to the recompiled kernel on boot.
Remote debugging over FireWire early on boot) and pass the parameter
"ohci1394_dma=early" to the recompiled kernel on boot.
Tools
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