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Message-ID: <Y73ub0xgNmY5/4Qr@lunn.ch> Date: Wed, 11 Jan 2023 00:02:07 +0100 From: Andrew Lunn <andrew@...n.ch> To: Vladimir Oltean <olteanv@...il.com> Cc: Angelo Dureghello <angelo@...nel-space.org>, netdev@...r.kernel.org Subject: Re: mv88e6321, dual cpu port > > I cannot actually upgrade the kernel, due to cpu producer > > customizations that are not mainlined, so would try to > > downgrade the driver. > > The delta between v5.4 and the kernel where support for multiple CPU > ports was added is ~600 patches to the net/dsa/ folder alone. There are > some non-trivial interdependencies with phylib, phylink, devlink, switchdev. > You might also need support for the end result, if you end up cherry picking > only what you think is useful. Hopefully that will help you reconsider. v5.4 is really old, v5.10, v5.15 and v6.1 are also LTS kernels. I suggest you ask your CPU vendor for a v6.1, or v5.15 port of their vendor tree. v5.4 has a projected End Of Life December 2025, so if you are going to invest a few months effort trying to get this working, do you have enough time left to get some return on your investment? And a plan what to do once it is EOL? Andrew
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