[OpenWrt-Devel] [PATCH 2/2] kernel: add at803x fix for sgmii mode

Roman Yeryomin leroi.lists at gmail.com
Sun Dec 20 13:20:12 EST 2015

On 20 December 2015 at 15:13, Christian Lamparter
<chunkeey at googlemail.com> wrote:
> Hello,
> On Sunday, December 20, 2015 02:30:39 AM Roman Yeryomin wrote:
>> Some (possibly broken) bootloaders incorreclty initialize at8033
>> phy. This patch enables sgmii autonegotiation mode.
>> Signed-off-by: Roman Yeryomin <roman at advem.lv>
>> ---
> Can you tell us a bit about the "possibly broken" bootloaders you talk
> about? Like what devices (based "possibly" on QCA956x) have those and
> from where you are getting this information?

The device is uapac.
But I'm taking about phy setup itself...

> I'm asking because we (Chris and I) encountered similar issues with the
> Cisco Merakin MR18. It has a AR8035-A (confirmed by opening up the device)
> but calls it a AR8033. The PHY apparently connected via RGMII
> (uses QCA955X_ETH_CFG_RGMII_EN [0]) but the device needs to write some
> calibration values to SGMII and SERDES registers in order to work [1].
> We are quite keen to know what's going on since this seems counter-intuitive.

..and you are talking about SoC's gmac setup, which is completely
different thing.
Also, FYI, AR8035 doesn't have sgmii, it has rgmii only.

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