mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-07 19:30:30 +09:00
fcbec99d51
Master fetch data and cpu update page table may work in parallel, may have the following procedure: master cpu fetch dte update page table | | (make dte invalid) <- zap iotlb entry | | fetch dte again | (make dte invalid) <- zap iotlb entry | | fetch dte again | (make dte invalid) <- zap iotlb entry | | fetch dte again | (make iommu block) <- zap iotlb entry New iommu version has the above bug, if fetch dte consecutively four times, then it will be blocked. Fortunately, we can set bit 31 of register MMU_AUTO_GATING to 1 to make it work as old version which does not have this issue. This issue only appears on RV1126 so far, so make a workaround dedicated to "rockchip,rv1126" machine type. Change-Id: I808bf87898e2dfdd8ada5666234e4c2c3237ffde Signed-off-by: Simon Xue <xxm@rock-chips.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.
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.