Changes to the FireWire kernel drivers in Linux 3.5

[Stefan R. <st...@s5...>]

Hi everybody,

as you certainly noticed, Linux kernel 3.5 has been released 8 days ago.
It brings the following IEEE 1394 related changes:

firewire-core:
  - Fix mismatch between DMA mapping direction and DMA synchronization
    direction of isochronous reception buffers of userspace drivers if
    vma-mapped for R/W access. Depending on IOMMU properties of the
    hardware, this bug could have caused e.g. failures to capture video
    through libdc1394.
  - more consistent retry stategy in device discovery/ rediscovery, and
    improved failure diagnostics

sbp-target:
  - New driver written by Chris Boot: Adds SCSI target functionality over
    FireWire.  This enables a Linux node to act as SBP-2/ SCSI device to
    other nodes on the FireWire bus, for example as hard disk — similar to
    FireWire Target Disk mode of the firmware of many Apple computers.

    Any SCSI command set supported by the Linux target core, multiple
    logical units on the target node, and concurrent login by initiators
    are supported by sbp-target.  In the kernel configuration menu, the
    sbp-target option resides under "Device Drivers/ Generic Target Core
    Mod (TCM) and ConfigFS Infrastructure/ FireWire SBP-2 fabric module". 

    sbp-target thus takes the place of the older SBP-2 target
    implementation, "Endpoint" from Oracle.  Endpoint is a userspace
    implementation and requires libraw1394 plus the old raw1394 kernel
    driver (but could be ported to libraw1394 v2.1.0 and the current
    firewire-core driver).  Furthermore, Endpoint so far only supports the
    RBC command set.

Some brief getting-started instructions have been collected at
https://ieee1394.wiki.kernel.org/index.php/Sbp-target .
-- 
Stefan Richter
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http://arcgraph.de/sr/