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From: "Pali Rohár" <pali@kernel.org>
To: "Russell King (Oracle)" <linux@armlinux.org.uk>
Cc: Madalin Bucur <madalin.bucur@nxp.com>,
	Andrew Lunn <andrew@lunn.ch>,
	Igal Liberman <Igal.Liberman@freescale.com>,
	Shruti Kanetkar <Shruti@freescale.com>,
	Emil Medve <Emilian.Medve@freescale.com>,
	Scott Wood <oss@buserror.net>, Rob Herring <robh+dt@kernel.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Camelia Alexandra Groza (OSS)" <camelia.groza@oss.nxp.com>
Subject: Re: Unsupported phy-connection-type sgmii-2500 in arch/powerpc/boot/dts/fsl/t1023rdb.dts
Date: Sat, 5 Jun 2021 01:18:54 +0200	[thread overview]
Message-ID: <20210604231854.qi3o3k4rk23jjetg@pali> (raw)
In-Reply-To: <20210604192732.GW30436@shell.armlinux.org.uk>

On Friday 04 June 2021 20:27:33 Russell King (Oracle) wrote:
> 802.3 defined 1000base-X which is a fixed 1G speed interface using a
> 16-bit control word. Implementations of this exist where the control
> word can be disabled.
> 
> Cisco came along, took 1000base-X and augmented it to allow speeds of
> 10M and 100M by symbol repetition, and changing the format of the
> 16-bit control word. Otherwise, it is functionally compatible - indeed
> SGMII with the control word disabled will connect with 1000base-X with
> the control word disabled. I've done it several times.
> 
> There exists 2500base-X, which is 1000base-X clocked faster, and it
> seems the concensus is that it has the AN disabled - in other words,
> no control word.

Thank you for a nice explanation! I think that this information should
be part of documentation as it could help also other people to
understand differences between these modes.

      parent reply	other threads:[~2021-06-04 23:19 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-03 14:34 Unsupported phy-connection-type sgmii-2500 in arch/powerpc/boot/dts/fsl/t1023rdb.dts Pali Rohár
2021-06-03 15:12 ` Andrew Lunn
2021-06-03 19:48   ` Pali Rohár
2021-06-04  7:35     ` Madalin Bucur
2021-06-04 17:32       ` Pali Rohár
2021-06-04 19:13         ` Madalin Bucur
2021-06-04 19:27       ` Russell King (Oracle)
2021-06-04 19:39         ` Madalin Bucur
2021-06-04 20:00           ` Russell King (Oracle)
2021-06-04 21:37             ` Madalin Bucur
2021-06-04 20:23           ` Andrew Lunn
2021-06-04 21:47             ` Madalin Bucur
2021-06-04 23:34               ` Pali Rohár
2021-06-05  0:33                 ` Russell King (Oracle)
2021-06-05 12:26                   ` Vladimir Oltean
2021-06-05 12:50                     ` What is inside GPON SFP module? (Was: Re: Unsupported phy-connection-type sgmii-2500 in arch/powerpc/boot/dts/fsl/t1023rdb.dts) Pali Rohár
2021-06-05 13:04                       ` Hauke Mehrtens
2021-06-05 13:31                         ` What is inside GPON SFP module? Pali Rohár
2021-06-05 14:17                           ` Hauke Mehrtens
2021-06-05 14:41                         ` What is inside GPON SFP module? (Was: Re: Unsupported phy-connection-type sgmii-2500 in arch/powerpc/boot/dts/fsl/t1023rdb.dts) Russell King (Oracle)
2021-06-08 10:33                           ` What is inside GPON SFP module? Pali Rohár
2021-06-19 20:35                 ` Unsupported phy-connection-type sgmii-2500 in arch/powerpc/boot/dts/fsl/t1023rdb.dts Pali Rohár
2021-07-04 13:43                 ` [PATCH] powerpc/fsl/dts: Fix phy-connection-type for fm1mac3 Pali Rohár
2021-07-14 17:11                   ` Scott Wood
2021-08-27 11:38                     ` Pali Rohár
2021-09-28 21:39                       ` Pali Rohár
2021-09-29 14:25                         ` Andrew Lunn
2021-10-02  9:06                           ` Pali Rohár
2021-06-04 23:18         ` Pali Rohár [this message]

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