From: Nicolai Buchwitz <nb@tipi-net.de>
To: Andrew Lunn <andrew@lunn.ch>,
Janpieter Sollie <janpieter.sollie@kabelmail.de>
Cc: netdev@vger.kernel.org
Subject: Re: SFP/MDIO/I2C: help requested unlocking a SFP+ MCU to expose PHY
Date: Tue, 09 Jun 2026 10:32:00 +0200 [thread overview]
Message-ID: <582a4a1181bf110e97d8d2d249dbd42a@tipi-net.de> (raw)
In-Reply-To: <903daf32-aecd-4160-8f69-4fc329fdad3f@lunn.ch>
Hi Andrew + Janpieter
On 5.6.2026 18:51, Andrew Lunn wrote:
> [...]
> Do you know what MCU is in the SFP? Is there a data sheet for it? Can
> you read out the EEPROM holding its code over the I2C bus? You can
> then disassemble/decompile the code and see what it is actually doing.
It put up a bit of a fight, but in the end I managed to take it apart.
uC seems to be a GD32E230F8 [1] [2].
[1] https://www.keil.arm.com/devices/gigadevice-gd32e230f8/boards/
[2] https://odly.de/lkml/10gtek-sfp-phy.jpg
Regards
Nicolai
prev parent reply other threads:[~2026-06-09 8:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-05 8:09 SFP/MDIO/I2C: help requested unlocking a SFP+ MCU to expose PHY Janpieter Sollie
2026-06-05 16:51 ` Andrew Lunn
2026-06-05 18:16 ` Nicolai Buchwitz
2026-06-05 21:34 ` Andrew Lunn
2026-06-05 23:04 ` Nicolai Buchwitz
2026-06-08 9:20 ` Janpieter Sollie
2026-06-09 8:32 ` Nicolai Buchwitz [this message]
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