Re: [PATCH v2 3/3] arm64: dts: add Protonic PRT8ML board

Andrew Lunn
2025-09-18T15:05:04Z

> Yes, unfortunately the SJA1105Q does not support PAUSE frames, and the i.MX8MP
> FEC isn't able to sustain 1000Mbps (only about 400ish) due to insufficient
> internal bus bandwidth. It will generate PAUSE frames, but the SJA1105Q
> ignores these, leading to packet loss, which is obviously worse than
> restricting this link to 100Mbps. Ironically both chips are from the same
> manufacturer, yet are incompatible in this regard.

Thanks for the explanation. Maybe add a comment that the bandwidth is
limited due to the lack of flow control resulting in packet loss in
the FEC.

Anything which looks odd deserves a comment, otherwise somebody will
question it....

Andrew