Re: BCM54220: After the BCM54220 closes the auto-negotiation, the configuration forces the 1000M network port to be linked down all the time.

[Florian Fainelli]

On 2/17/23 00:06, Wang, Xiaolei wrote:
> hi
>
>      When I use the nxp-imx7 board, eth0 is connected to the PC, eth0 is 
> turned off the auto-negotiation mode, and the configuration is forced to 
> 10M, 100M, 1000M. When configured to force 1000M，
>      The link status of phy status reg(0x1) is always 0, and the chip of 
> phy is BCM54220, but I did not find the relevant datasheet on BCM 
> official website, does anyone have any suggestions or the datasheet of 
> BCM54220?

I don't have access to a system with a BCM54220 but can look at the 
datasheet, could you provide the full output of mii-diag in both cases? 
What do the PC report as far as link partner advertisement goes etc.?

You are using a twister pair cable to connect your two systems?
--
Florian