[U-Boot] putc

[Wolfgang Denk]

Dear Simon,

In message <CAPnjgZ1hKpGUCqU8D36VXm14jg_Xv=Q1qUh+kpnamJX6834_Yg at mail.gmail.com> you wrote:
> 
> > Adding a parameter to these exported functions will break backward
> > compatibility
> > of existing standalone apps
> 
> Yes that's right, but when they move to a newer U-Boot they will need
> to be updated. Isn't that expected with standalone apps? I can adjust
> things that are in the mainline tree, but I can't fix up people's
> third party apps.

Backard compatibility has never been an issue with SA applications.
The design intentionally introduced the XF_VERSION number (see
include/exports.h) which just has to be incremented to signalize
interface changes.

But then, putc() is a stdio function with well-known synopsis, and
this should never be changed.

> I did make a suggestion about how to avoid adding the extra parameter
> (changing the behaviour to call putc() instead of dev->putc()). What
> do you think?

Sounds better to me.

Best regards,

Wolfgang Denk

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