[Yaffs] Compile Time Parameters

Hi all,

first of all, please forgive me if the question is quite trivial (but
for me it's not). However, my question was: how to set, at compile
time, some Yaffs parameters (like CONFIG_YAFFS_DIRECT) without using
Kconfig and compiling the Kernel? If yes, how to do it (do I have to
change the code before compiling it)?
Thanks in advance for your attention and availability.

Best Regards
GR