eSCI patch [was Re: Freescale unified driver]

[Ilija Koco]

> I would prefer not to see these warnings with a default build.  I
> would add code to detect if no serial devices are enabled, and if so,
> not compile the redundent code. You can either do this in CDL, or in C
> with #if defined() statements.
>   
Thanks for advice Andrew. I'll see what's better - may come back for
advice again.

Now I would ask for a permission to add CYGPKG_IO_SERIAL_TTY_TTY2
"/dev/tty3" component in tty.cdl. It will allow for a tty counterpart
for /dev/ser3 (esci has 4 serial drivers and some other chips (now
and/or in future) may have). Imho it wont compromise other eCos
components. Please comment.

Regards
Ilija