[FS#4032] Uplink ethernet ports not connecting at gigabit speeds (Ath79)

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The following task has a new comment added:

FS#4032 - Uplink ethernet ports not connecting at gigabit speeds (Ath79)
User who did this - Peter Sherman (psherman)

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Boris - Thanks for all the new info

All three of affected routers known thus far use the AR7161 SoC. It would be nice to know if this affects any other SoCs in the family, or if this is unique to this specific chip.

We can also infer from the available data that this issue is caused by some commit that is present in 21.02 and not in 19.07 (the two other devices are available as ath79 targets for both of those versions), so we can reasonably assume that this specific bug is not directly related to the transition from ar71xx to ath79.

I have searched the git repos for changes that could affect this (searching commits for references to ar7161, ar7100, router station pro, WZR-HP-AG300H) -- I was unable to find anything obvious, but I'm not a developer and I don't really know how to identify the root-cause of this type of bug. I am hoping that one of the devs will see the bug and have some ideas.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4032#comment10187

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