[U-Boot-Users] MII - RMII Link status detection

[U-Boot-Users] MII - RMII Link status detection

[Ingo Swieter]

Hello,

i run u-boot on the Embedded Planet EP88xC evaluation board.
Like the name indicates the board is equipped with a Freescale
MPC885 processor.
On the board are two PHYs connected over MII. With u-boot
i am able to see the link status of the PHYs with a slightly
modified  do_mii function.

My main question is, if anyone knows, if it is also possible to
check the link status of the PHYs over RMII, because on our target
the PHYs shall be connected over the reduced interface.

My second problem has nothing to deal with u-boot but with Linux:
We want to use the two network devices as one bonding device for
high availability.So i configured and compiled the bonding module
and the ifenslave command. Transfered it to the eval board and
could successfully load (insmod) the module. The problem is that
the bonding module do not receive a link down signal from the
fec driver and so do not recognize a missing/broken cable or
similar.

Best Regards,
Ingo

-- 

Ingo Swieter

Tel: 05121/1760-821
Mail: ingo.swieter at brunel.de

Brunel GmbH
Bereich Communications
Daimlerring 9
31135 Hildesheim
Fax: 05121/1760-999
Internet: http://www.brunel.de

Hauptsitz: Airport City, Hermann-K?hl-Str. 1 a, 28199 Bremen
Amtsgericht Bremen HRB 16935
General Manager: Carsten Siebeneich

[U-Boot-Users] MII - RMII Link status detection

[Ben Warren]

Ingo,

On Wed, 2007-06-13 at 15:08 +0200, Ingo Swieter wrote:
> Hello,
> 
> i run u-boot on the Embedded Planet EP88xC evaluation board.
> Like the name indicates the board is equipped with a Freescale
> MPC885 processor.
> On the board are two PHYs connected over MII. With u-boot
> i am able to see the link status of the PHYs with a slightly
> modified  do_mii function.
> 
> My main question is, if anyone knows, if it is also possible to
> check the link status of the PHYs over RMII, because on our target
> the PHYs shall be connected over the reduced interface.
> 
The differences between MII and RMII are in the data plane.  As you
mention, RMII uses a reduced set of DATA pins.  As long as you still
have the MDIO control plane connected (MDIO and MDC pins), you should be
able to get link status.
> My second problem has nothing to deal with u-boot but with Linux:
> We want to use the two network devices as one bonding device for
> high availability.So i configured and compiled the bonding module
> and the ifenslave command. Transfered it to the eval board and
> could successfully load (insmod) the module. The problem is that
> the bonding module do not receive a link down signal from the
> fec driver and so do not recognize a missing/broken cable or
> similar.
> 
No experience here.  Sorry.

regards,
Ben

[U-Boot-Users] MII - RMII Link status detection

[Ingo Swieter]

Ben Warren schrieb:
> Ingo,
>
> On Wed, 2007-06-13 at 15:08 +0200, Ingo Swieter wrote:
>   
>> [.. difference MII - RMII ..]
>>     
> The differences between MII and RMII are in the data plane.  As you
> mention, RMII uses a reduced set of DATA pins.  As long as you still
> have the MDIO control plane connected (MDIO and MDC pins), you should be
> able to get link status.
>   
Thank you for the information, that was what i hoped and thought.

Best Regards,
Ingo

-- 
Ingo Swieter 

Tel: 05121/1760-821
Mail: ingo.swieter at brunel.de

Brunel GmbH
Bereich Communications
Daimlerring 9
31135 Hildesheim
Fax: 05121/1760-999
Internet: http://www.brunel.de

Hauptsitz: Airport City, Hermann-K?hl-Str. 1 a, 28199 Bremen
Amtsgericht Bremen HRB 16935
General Manager: Carsten Siebeneich

[U-Boot-Users] MII - RMII Link status detection

[Martin Krause]

Hi,

u-boot-users-bounces at lists.sourceforge.net wrote on :
> My second problem has nothing to deal with u-boot but with Linux:
> We want to use the two network devices as one bonding device for
> high availability.So i configured and compiled the bonding module
> and the ifenslave command. Transfered it to the eval board and
> could successfully load (insmod) the module. The problem is that
> the bonding module do not receive a link down signal from the
> fec driver and so do not recognize a missing/broken cable or
> similar.

Does your fec driver support link status changes? Are there kernel
messages generated, if you plug/unplug your ethernet cable? If 
not, the driver maybe does not support the link status change 
interrupt. Or the PHY interrupt line is not connected with 
the cpu on your hardware?

Regards,

Martin Krause

--
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