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

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Message-ID: <ae41658a-ddf9-290d-e674-550372619b8f@gmail.com>
Date:   Fri, 17 Feb 2023 09:13:30 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     "Wang, Xiaolei" <Xiaolei.Wang@...driver.com>,
        "bcm-kernel-feedback-list@...adcom.com" 
        <bcm-kernel-feedback-list@...adcom.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "richardcochran@...il.com" <richardcochran@...il.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: BCM54220: After the BCM54220 closes the auto-negotiation, the
 configuration forces the 1000M network port to be linked down all the time.

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