[PATCH 4/5] powerpc/zImage: Rework serial driver probing

[Michael Ellerman]

Oliver O'Halloran <oohall at gmail.com> writes:

> Rather than checking the compatible string in serial_driver_init()
> we call into the driver's init function and wait for a driver to
> inidicate it bound to the device by returning zero.
>
> The pointers to each driver probe functions are stored in the
> ".serialdrv" section of the zImage, similar to how initcalls and
> whatnot are handled inside Linux. This structure allows us to
> conditionally compile specific driver files based on the KConfig
> settings. This is needed because we don't have access to the
> KConfig #defines in the zImage source files (it's a giant #include
> headache) so conditional compilation is the only way to eliminate
> unnecessary code.

Did you actually get the config.h include working? Or was it such a big
headache that it doesn't even work?

I'm pretty happy with this patch regardless, but it would be simpler and
less bug prone if the CONFIG_ symbols were usable in the boot code.

cheers