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The TLAST flag is used by the DMAC HDL controller to signal to the controller that the following segment (to be submitted) is the last one (in a series of segments). A receiver DMA (typically another DMAC) can read this parameter (from the transfer), and terminate the transfer earlier. A typical use-case for this, is when the receiver expects a certain amount of segments, but for some reason (e.g. an ADC capture which can have an unknown number of digital samples) the number of actual segments is smaller. The receiver would read this flag, and then the DMAC would finish. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Signed-off-by: Vinod Koul <vkoul@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.