[U-Boot] SMSC LAN8720 support

[U-Boot] SMSC LAN8720 support

[Maxim Podbereznyi]

Hi all!

I need enable the support of the new SMSC Ethernet PHY LAN8720 in
AT91SAM based system. Can anybody give me a piece of advice how I can
do it?

Any help is appreciated!

Regards,
Max

[U-Boot] SMSC LAN8720 support

[Ben Warren]

Hi Maxim,
On 2/7/2010 1:32 PM, Maxim Podbereznyi wrote:
> Hi all!
>
> I need enable the support of the new SMSC Ethernet PHY LAN8720 in
> AT91SAM based system. Can anybody give me a piece of advice how I can
> do it?
>
>    
  I don't have any direct experience with either this PHY or AT91SAM, 
but a cursory glance of the PHY datasheet makes it seem that there's 
nothing special here, so it might just work without modification.  Do 
you have a working reference board that has a different PHY that this 
can be compared to?
> Any help is appreciated!
>
> Regards,
> Max
> _
>    
regards,
Ben

[U-Boot] SMSC LAN8720 support

[Ben Warren]

Hi Maxim,

Two housekeeping items:
1. Please don't top-post
2. Please CC the mailing list.  There are others that may be able to 
help you.

On 2/9/2010 12:11 PM, Maxim Podbereznyi wrote:
> Hi Ben!
>
> Thank you for answering!
>
> Unfortunately I don't have any other board to check the Ethernet. I
> began to check sources and found that PHY ID is not read well.
>
> In the following code I have "No PHY present" on the console:
> /* Check if the PHY is up to snuff... */
>          phy_id = macb_mdio_read(macb, MII_PHYSID1);
>          if (phy_id == 0xffff) {
>                  printf("%s: No PHY present\n", netdev->name);
>                  return 0;
>          }
> }
>
> I think at least ID must be read well. Bad luck :(
>
>    
Are you passing the correct PHY address as parameter 3 to 
macb_eth_initialize()?  You should know the address from the board 
schematic.  Alternatively, it appears that MACB has an option called 
CONFIG_MACB_SEARCH_PHY that will probe the MDIO bus.  You might wish to 
enable that option.

The MII_PHYSID1 is an IEEE 802.3-specified register.  If you can't read 
it, it's not anything peculiar to the new type of PHY, but more likely a 
hardware/bootstrap issue.   Any incompatibilities with this PHY will 
come later when you try to configure some of the less-standard things 
such as RGMII etc.

regards,
Ben

[U-Boot] SMSC LAN8720 support

[Maxim Podbereznyi]

Hi Ben!

I've made LAN8720 work with AT91SAM9G45 MPU. The problem was in a wrong
address assigning during the PHY reset. The PHY has internal pull-down on
the PHYAD0 line but the init code for AT91 turns off processor's pull-up
during PHY reset only for a few lines and they are not PHYAD0. So I disabled
also the processor's pull-up to the right line and the PHY got alive. I've
tested tftp - works perfect!

Thank you for the help!

2010/2/8 Ben Warren <biggerbadderben@gmail.com>

> Hi Maxim,
>
> On 2/7/2010 1:32 PM, Maxim Podbereznyi wrote:
>
>> Hi all!
>>
>> I need enable the support of the new SMSC Ethernet PHY LAN8720 in
>> AT91SAM based system. Can anybody give me a piece of advice how I can
>> do it?
>>
>>
>>
>  I don't have any direct experience with either this PHY or AT91SAM, but a
> cursory glance of the PHY datasheet makes it seem that there's nothing
> special here, so it might just work without modification.  Do you have a
> working reference board that has a different PHY that this can be compared
> to?
>
>> Any help is appreciated!
>>
>> Regards,
>> Max
>> _
>>
>>
> regards,
> Ben
>

[U-Boot] SMSC LAN8720 support

[Ben Warren]

On 2/9/2010 1:04 PM, Maxim Podbereznyi wrote:
> Hi Ben!
>
> I've made LAN8720 work with AT91SAM9G45 MPU. The problem was in a 
> wrong address assigning during the PHY reset. The PHY has internal 
> pull-down on the PHYAD0 line but the init code for AT91 turns off 
> processor's pull-up during PHY reset only for a few lines and they are 
> not PHYAD0. So I disabled also the processor's pull-up to the right 
> line and the PHY got alive. I've tested tftp - works perfect!
>
> Thank you for the help!
>
You're welcome.  Congratulations!

--Ben