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Stephane Grosjean
5d4c94ed9f
The DMA logic in firmwares < v3.3.0 embedded in the PCAN-PCIe FD cards family is not capable of handling a mix of 32-bit and 64-bit logical addresses. If the board is equipped with 2 or 4 CAN ports, then such a situation might lead to a PCIe Bus Error "Malformed TLP" packet as well as "irq xx: nobody cared" issue. This patch adds a workaround that requests only 32-bit DMA addresses when these might be allocated outside of the 4 GB area. This issue has been fixed in firmware v3.3.0 and next. Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com> Cc: linux-stable <stable@vger.kernel.org> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.