2.5 Gbps Nic? - Marvell ESPRESSObin

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This topic has 2 replies, 3 voices, and was last updated 3 years, 1 month ago by pali.

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July 17, 2020 at 5:46 pm #41681

mayli
Participant

I am looking at few places including

http://wiki.espressobin.net/tiki-index.php?page=Armada+3700

It’s saying

2 x Gigabit Ethernet 1Gbps / 2.5Gbps
SGMII / HS-SGMII / RGMII

does that mean we actually have 2.5Gbps Nic x2?
I also find this link

http://blog.raymond.burkholder.net/index.php?/archives/968-EspressoBin-First-Boot.html

It’s also saying

..and I think i’m officially convinced that the max bandwidth between topaz switch and cpu is in fact 1gigabit… The connection is using a seperate RGMII lane. (eth0)

Anyone has any luck on enabling 2.5Gbps mode?

July 20, 2020 at 7:09 pm #41747

Kevin
Keymaster

Hi,

Marvell 3720 can support two 2.5G serdes(HS-SGMII).
Topaz CPU port can set to highest 2.5G.
EspressoBin V7 won’t be able to enable 2.5G mode since it is using RGMII(not serdes). RGMII supports highest 1G only.

thanks

Kevin

August 25, 2020 at 8:08 pm #41841

pali
Participant

EspressoBin does not use SerDes for SGMII (2.5G ethernet) but rather for SATA. Therefore Topaz switch is not connected via SerDes/SGMII but via RGMII which is limited to 1G.

Armada 3720 has 3 SerDeses and on EspressoBin one is configured in PCIe mode, another in USB3.0 and another in SATA. So there was no free SerDes for SGMII 2.5G. As Armada 3720 has also extra RGMII and authors of EspressoBin wanted to have PCIe, USB3.0 and SATA ports, the only option was to connect ethernet via extra RGMII (1Gbps).

So enabling 2.5Gbps ethernet on EspressoBin is not possible.

You can look at Turris MOX device https://www.turris.com/en/mox/ based on same Armada 3720 SOC where SerDes is configured in SGMII 2.5Gbps mode.
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