[ECOS] Q: how to select PHY for Ethernet driver?

Jonathan Larmour jlarmour@cygnus.co.uk
Fri Dec 8 12:37:00 GMT 2000

Grant Edwards wrote:
> Hi,
> I've got an Ethernet driver than will currently use either of
> two types of PHY (determined by linking either of two object
> files with the driver).  I'll soon need to add support for a
> third.  Currently the PHY selection is hard-wired (it can't be
> changed using ecosconfig).
> I'd like to be able to select the PHY using ecosconfig, and it
> appears I could do it two ways:
>   1) Have the PHY selection be a configuration parameter in
>      the CDL description of my driver that changes the list of
>          files to be linked.
>   2) Have the PHY support implemented in separate packages that
>          can be enabled/disabled (only one could be enabled at a
>          time).
> Is there any conventional wisdom that would lead one to pick
> one approach over the other?

If these are actually different board hardware configurations then the
second would seem sensible. But if there is a lot of code sharing (i.e. the
types of PHY are actually pretty similar in all but detail that can be
abstracted out) then 1) is probably the way to go.

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