[U-Boot] [PATCH 4/5] powerpc: keymile: Add a check for the PIGGY debug board

[Heiko Schocher <hs@denx.de>]

Hello Gray,

Gary Jennejohn schrieb:
> On Thu, 13 Nov 2008 09:30:51 -0800
> Ben Warren <biggerbadderben@gmail.com> wrote:
> 
>> Heiko Schocher wrote:
>>> Hello Ben
>>>
>>> Ben Warren wrote:
>>>   
>>>> Heiko Schocher wrote:
>>>>   
>>>>     
>>>>> Check the presence of the PIGGY on the keymile boards mgcoge,
>>>>> mgsuvd and kmeter1. If the PIGGY is not present, dont register
>>>>> this Ethernet device.
>>>>>
>>>>> Signed-off-by: Heiko Schocher <hs@denx.de>
>>>>> ---
>>>>>     
>>>>>       
>>>> This looks like useful stuff to have, but I'd prefer that you put the 
>>>> check logic in board_eth_init() rather than adding to the individual 
>>>> device drivers.  I know the 8260 SCC driver is the older style, which 
>>>> precludes the use of board_eth_init, but I'll convert it if you're able 
>>>> to test.
>>>>   
> 
> Unfortunately, this approach won't work.  First of all, the 82xx SCC
> driver is now initialized in cpu_eth_init(), which knows nothing about
> board-specific peculiarities like the PIGGY.  Secondly, the HDLC
> driver for Keymile has to be initialized in board_eth_init(), and it
> has nothing to do with the PIGGY.  Putting the check in board_eth_init()
> would break it completely.  I looked at Heiko's latest patch and couldn't
> figure out a way to cleanly differentiate between initializing the HDLC
> driver and checking whether the PIGGY was present fo the other ENET drivers.

Hmm.. you can now initialize in board_eth_init () in board/keymile/common/common.c
your HDLC specific things, or?

[...]
>> That's what board_eth_init() and cpu_eth_init() are for.  In addition, I 
>> forgot to mention that a couple of days ago Gary Jennejohn submitted a 
>> patch for changing the 82xx SCC driver over to CONFIG_NET_MULTI style.
>>
> 
> Correct, and it must explicitly call ethernet_present() - see above.

If I understand the actual code right, then _now_ (which means actual
top of tree+ patch 4/5) it gets first called board_eth_init (). There,
I check if ethernet_present (), and if so, I return -1, which will result
in calling cpu_eth_init(). If the ethernet is not present, it returns 0,
which will result in not calling cpu_eth_init() ... And your HDLC
initialization can be done in board_eth_init() ... thats what we need,
or?

bye,
Heiko
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