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| author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-26 07:48:27 -0800 |
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| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-26 07:48:27 -0800 |
| commit | 98c1fc934c097d84dc30c639e9bdb0b992ef53e2 (patch) | |
| tree | 69150e7ca6b4a0eb842d5135164ee1d40a4dabbe /Documentation | |
| parent | 7c811e4b6af424c295e3c6438fdc9b647fe6595f (diff) | |
| parent | fae603121428ba83b7343c88e68a7144525ab3eb (diff) | |
| download | lwn-98c1fc934c097d84dc30c639e9bdb0b992ef53e2.tar.gz lwn-98c1fc934c097d84dc30c639e9bdb0b992ef53e2.zip | |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
firewire: fix NULL pointer deref. and resource leak
Documentation: correction to debugging-via-ohci1394
ieee1394: sbp2: fix rescan-scsi-bus
firewire: fw-sbp2: fix NULL pointer deref. in scsi_remove_device
firewire: fw-sbp2: fix NULL pointer deref. in slave_alloc
firewire: fw-sbp2: (try to) avoid I/O errors during reconnect
firewire: fw-sbp2: enforce a retry of __scsi_add_device if bus generation changed
firewire: fw-sbp2: sort includes
firewire: fw-sbp2: logout and login after failed reconnect
firewire: fw-sbp2: don't add scsi_device twice
firewire: fw-sbp2: log bus_id at management request failures
firewire: fw-sbp2: wait for completion of fetch agent reset
ieee1394: sbp2: add INQUIRY delay workaround
firewire: fw-sbp2: add INQUIRY delay workaround
firewire: log GUID of new devices
firewire: fw-sbp2: don't retry login or reconnect after unplug
firewire: fix "kobject_add failed for fw* with -EEXIST"
firewire: fw-sbp2: fix logout before login retry
firewire: fw-sbp2: unsigned int vs. unsigned
Diffstat (limited to 'Documentation')
| -rw-r--r-- | 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 de4804e8b396..c360d4e91b48 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: |