Use _ABS in Makefiles wherever possible.

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

FMC_BUS_ABS is passed to Kbuild, which uses different current directory.
It is not trivial to handle FMC_BUS to be absolute or relative path.

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

This allows parallel build.

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Include parent_common.mk from up directory. Which may contain various
environment definitions such compiler, linker, etc. If such file is not
present it will not affect build.

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Mainly for compatibility (simplification) with the CERN super module.
Insted of using a script to guess which fmc-bus define, assume always
that parent project define the FMC_BUS to use.

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

This patch adds a script "check-fmc-bus" that returns the pathname of
the fmc-bus kernel driver, either under this directory or under
../fmc-bus .  The former applies when fmc-bus is a submodule of this
package, the latter applies when we both are submodules of another
package.

The final aim is helping the naive user, who just wants to build it
all in a single step -- both if building this package or another
package that depends on both fmc-bus and this one.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>