lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Fri, 12 Jun 2020 09:47:10 +0100
From:   Russell King - ARM Linux admin <>
To:     Sascha Hauer <>
        Thomas Petazzoni <>,,,
Subject: Re: [PATCH v2] net: mvneta: Fix Serdes configuration for 2.5Gbps

On Fri, Jun 12, 2020 at 10:38:47AM +0200, Sascha Hauer wrote:
> The Marvell MVNETA Ethernet controller supports a 2.5Gbps SGMII mode
> called DRSGMII. Depending on the Port MAC Control Register0 PortType
> setting this seems to be either an overclocked SGMII mode or 2500BaseX.
> This patch adds the necessary Serdes Configuration setting for the
> 2.5Gbps modes. There is no phy interface mode define for overclocked
> SGMII, so only 2500BaseX is handled for now.
> As phy_interface_mode_is_8023z() returns true for both
> explicitly test for 1000BaseX instead of using
> phy_interface_mode_is_8023z() to differentiate the different
> possibilities.
> Fixes: da58a931f248f ("net: mvneta: Add support for 2500Mbps SGMII")
> Signed-off-by: Sascha Hauer <>

2500base-X is used today on Armada 388 and Armada 3720 platforms and
works - it is known to interoperate with Marvell PP2.2 hardware, as
well was various SFPs such as the Huawei MA5671A at 2.5Gbps.  The way
it is handled on these platforms is via the COMPHY, requesting that
the serdes is upclocked from 1.25Gbps to 3.125Gbps.

This "DRSGMII" mode is not mentioned in the functional specs for either
the Armada 388 or Armada 3720, the value you poke into the register is
not mentioned either.  As I've already requested, some information on
exactly what this "DRSGMII" is would be very useful, it can't be
"double-rate SGMII" because that would give you 2Gbps instead of 1Gbps.

So, I suspect this breaks the platforms that are known to work.

We need a proper description of what DRSGMII is before we can consider
taking any patches for it.

So, sorry, but NAK.

RMK's Patch system:
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

Powered by blists - more mailing lists