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From: Neil Armstrong <narmstrong@baylibre.com>
To: Piero <ottuzzi@gmail.com>
Cc: linux-amlogic@lists.infradead.org
Subject: Re: odroidc1 eth0 problem with 250HZ
Date: Tue, 12 Feb 2019 14:57:48 +0100	[thread overview]
Message-ID: <186a965b-043e-511f-aa84-980e4bac2388@baylibre.com> (raw)
In-Reply-To: <CAPo5REGnr=c=6OGm=b5Bmu7mDravAfMJ0f=OAD=iLS=21ZM+kg@mail.gmail.com>

Hi Piero,

On 12/02/2019 14:21, Piero wrote:
> Hi,
> 
>   in an old thread[1] there is this sentence: " - enable Ethernet on
> the Odroid-C1 (according to your last thest a TX delay of 4ns is
> required to make it work properly)".

This delay is a setting in HW, and it not correlated at all with the HZ setting.

> So it looks that timing is important to make eth0 of odroidc1
> functional and this correlate well with my observations on kernel HZ.
> I just tested with 200hz (simply only this change...nothing more) and
> odroidc1 eth0 is not working again.

You mean *is working* again ?

You should test a whole range of values, up to 1000Hz.

Neil

> 
> *Ciao
> Piero
> 
> [1]https://lists.infradead.org/pipermail/linux-amlogic/2018-January/006164.html
> 
> Il giorno lun 28 gen 2019 alle ore 11:08 Neil Armstrong
> <narmstrong@baylibre.com> ha scritto:
>>
>> Hi,
>>
>> On 24/01/2019 15:22, Piero wrote:
>>> Hi,
>>>
>>>     I tested armbian distribution on my odroid C1+ using kernel
>>> 4.19.17 and later.
>>> I observed that with 250HZ kernel eth0 is non-functional giving the
>>> following error:
>>>
>>> [   14.853086] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
>>> [   14.853367] meson8b-dwmac c9410000.ethernet eth0: device MAC
>>> address b6:e8:26:b6:da:4a
>>> [   14.853378] meson8b-dwmac c9410000.ethernet eth0: Could not attach to PHY
>>> [   14.853386] meson8b-dwmac c9410000.ethernet eth0: stmmac_open:
>>> Cannot attach to PHY (error: -19)
>>> [   15.064433] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
>>> [   15.084471] meson8b-dwmac c9410000.ethernet eth0: Could not attach to PHY
>>> [   15.084486] meson8b-dwmac c9410000.ethernet eth0: stmmac_open:
>>> Cannot attach to PHY (error: -19)
>>> [   15.193033] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
>>> [   15.225926] meson8b-dwmac c9410000.ethernet eth0: Could not attach to PHY
>>> [   15.225958] meson8b-dwmac c9410000.ethernet eth0: stmmac_open:
>>> Cannot attach to PHY (error: -19)
>>> [   15.239227] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
>>> [   15.293190] meson8b-dwmac c9410000.ethernet eth0: Could not attach to PHY
>>> [   15.293213] meson8b-dwmac c9410000.ethernet eth0: stmmac_open:
>>> Cannot attach to PHY (error: -19)
>>> [   15.306038] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
>>> [   15.352091] meson8b-dwmac c9410000.ethernet eth0: Could not attach to PHY
>>> [   15.352111] meson8b-dwmac c9410000.ethernet eth0: stmmac_open:
>>> Cannot attach to PHY (error: -19)
>>> [   15.370056] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
>>>
>>> Only changing 250HZ to 100HZ is enough to fix this problem.
>>> Some more details on armbian forum[1].
>>> Can you check it please?
>>> I can provide more logs and details if requested. If needed I can test fixes.
>>
>> This is weird, it could be a sleep not long enough with the changed HZ, can you test other values ?
>>
>> Do you have other failures ?
>>
>> Neil
>>
>>>
>>> Thanks in advance
>>> **Bye
>>> Piero
>>> [1]https://forum.armbian.com/topic/9138-odroid-c0c1c1-please-update-the-mainline-kernel-version/
>>>
>>> _______________________________________________
>>> linux-amlogic mailing list
>>> linux-amlogic@lists.infradead.org
>>> http://lists.infradead.org/mailman/listinfo/linux-amlogic
>>>
>>
>>
> 
> 


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  reply	other threads:[~2019-02-12 13:58 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-24 14:22 Piero
2019-01-28 10:08 ` Neil Armstrong
2019-02-12 13:21   ` Piero
2019-02-12 13:57     ` Neil Armstrong [this message]
2019-02-12 15:07       ` Piero

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