Re: [PATCH v4 0/2] ARM: dts: aspeed: Add ASRock Rack B650D4U BMC

[Andrew Lunn]

On Sun, Aug 30, 2026 at 11:50:34PM +0530, Prasanth Kumar Padarthi wrote:
> Add device tree support for the ASRock Rack B650D4U BMC, which is
> based on the ASPEED AST2600 SoC.
> 
> The series adds the board compatible and describes the BMC memory,
> SPI NOR flash layout, UART console, and MAC0 connected to an
> RTL8211F Ethernet PHY.
> 
> The MAC0 RGMII timing configuration was validated on B650D4U
> hardware. With plain "rgmii", the PHY negotiated 1000baseT/Full but
> received no valid packets and accumulated RX CRC errors. With
> "rgmii-rxid", a 5000-packet test completed with 0% packet loss and
> no RX CRC errors. "rgmii-id" was also tested successfully, but the
> additional TX delay is not required, so "rgmii-rxid" is retained.

Please take a read of:

https://elixir.bootlin.com/linux/v6.15/source/Documentation/devicetree/bindings/net/ethernet-controller.yaml#L287

Does the PCB have 2ns of delay for TX, but notR RX?

     Andrew