Dear Graeme Russ,
P.S. Here's a thought I ended up discarding: Each board could have a main config with all the common configuration values and a number of secondary includes (which include the primary) for each specific configuration. The entry in boards.cfg would select a specific config_xxx.h file
eg
boards.cfg: TQM8260 powerpc mpc8260 tqm8260 tqc - TQM8260_AB powerpc mpc8260 tqm8260 tqc -
/include/configs/TQM8260_AB.h:
#include "configs/TQM8260.h"
#define MPC8260 #define 200MHz #define L2_CACHE #define BUSMODE_60x
That would make more sense to me. But it would even more crowd the include/configs directory. A while ago I had proposed to change over to: include/configs/<vendor>/<board>.h but that was rejected.
[Observation:] But if we really head for linux style *config we would need a <board>_defconfig individually for each variant... But I don't think we are there anytime soon. Many configs contain conditionals and *config does not handle long (multiline) strings nicely...
Best Regards, Reinhard