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Valid ranges for the I2S peripheral's FIFO configuration include a depth of 16 - unconditionally setting the burst length to 16 with a fifo threshold of size/2 will cause under/overflows. For DMA engines with restricted capabilities the requested burst length and FIFO thresholds need to be adjusted downward accordingly. Both the RX and TX FIFOs operate on "less-than" thresholds. Setting the TX threshold to fifo_size minus burst means the FIFO is kept nearly-full. Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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.
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