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Since the conversion of mtk_eth_soc to phylink's supported_interfaces bitmap, these two modes have not been selectable. No one has raised this as an issue. Checking the in-kernel DT files, none of them use either of these modes with this hardware. Daniel Golle concurs: A quick grep through the device trees of the more than 650 ramips and mediatek boards we support in OpenWrt has revealed that *none* of them uses either reduced-MII or reverse-MII PHY modes. I could imaging that some more specialized ramips boards may use the RMII 100M PHY mode to connect with exotic PHYs for industrial or automotive applications (think: for 100BASE-T1 PHY connected via RMII). I have never seen or touched such boards, but there are hints that they do exist. For reverse-MII there are cases in which the Ralink SoC (Rt305x, for example) is used in iNIC mode, ie. connected as a PHY to another SoC, and running only a minimal firmware rather than running Linux. Due to the lack of external DRAM for the Ralink SoC on this kind of boards, the Ralink SoC there will anyway never be able to boot Linux. I've seen this e.g. in multimedia devices like early WiFi-connected not-yet-so-smart TVs. Consequently, the conclusion is that no one uses these modes with this hardware, so we might as well drop support for them. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Signed-off-by: Paolo Abeni <pabeni@redhat.com> |
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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.