Dear Simon,
In message CAPnjgZ1hKpGUCqU8D36VXm14jg_Xv=Q1qUh+kpnamJX6834_Yg@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