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From: "David Müller (ELSOFT AG)" <d.mueller@elsoft.ch>
To: "David Müller (ELSOFT AG)" <d.mueller@elsoft.ch>
Cc: andrew may <acmay@acmay.homeip.net>, Armin <akuster@pacbell.net>,
	Stefan Roese <stefan.roese@esd-electronics.com>,
	linuxppc-embedded@lists.linuxppc.org
Subject: Re: 405 MII-PHY communication problem (was: Re: PPC405gp enet Soft Reset)
Date: Tue, 19 Feb 2002 13:05:44 +0100	[thread overview]
Message-ID: <3C723F98.7050402@elsoft.ch> (raw)
In-Reply-To: 3C6A25BC.7010704@elsoft.ch


Hi

The problem with the even-numbered PHY register addresses seems to be
caused by a too weak or totally missing pullup resistor on the MDIO line.

David Müller (ELSOFT AG) wrote:
>
> Hi
>
> andrew may wrote:
>
>> On Mon, Feb 11, 2002 at 12:55:05PM +0100, David Müller (ELSOFT AG) wrote:
>>
>>> Hi
>>>
>>> andrew may wrote:
>>>
>>>> Here is a log from ppcboot since it is easy to test this there
>>>> without doing
>>>> a kernel build. My phy is at address 0x1f.
>>>>
>>>> => mii read 0x1 2
>>>> 07FF
>>>> => mii read 0x1 3
>>>> read err 3
>>>> a2: read: EMAC_STACR=0xffffc023, i=2
>>>> Error reading from the PHY
>>>> 07FF
>>>>
>>>>
>>> I'm seeing this error too on our boards. But i'm not certain, if it's a
>>> problem of the MII controller in the 405 or a problem of the LXT971.
>>> What revision of the 405 do you have? What clock frequency your 405
>>> run at?
>>>

[old stuff deleted]



Dave

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

  parent reply	other threads:[~2002-02-19 12:05 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-02-08  3:17 PPC405gp enet Soft Reset andrew may
2002-02-08 10:03 ` Stefan Roese
2002-02-08 18:35   ` andrew may
2002-02-08 10:53     ` Armin
2002-02-08 20:01       ` andrew may
2002-02-11 11:55         ` David Müller (ELSOFT AG)
2002-02-12  0:49           ` andrew may
2002-02-13  8:37             ` 405 MII-PHY communication problem (was: Re: PPC405gp enet Soft Reset) David Müller (ELSOFT AG)
2002-02-13 15:15               ` Stefan Roese
2002-02-19 12:05               ` David Müller (ELSOFT AG) [this message]
2002-02-19 12:21                 ` Stefan Roese
2002-02-22  0:56                 ` andrew may

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