>  ...Tsubai added a defopt of
>  L2CR_CONFIG in early November.
>  
>  If you are running 1.5 (not sure if this feature is there), ...

Yup!  Hats off to someone for a bit of intelligent programming.
Apparently, if no one's made a defopt for the "option," you get a
command line parameter input, such as:

> cc -O2 -pipe -Werror -Wreturn-type -Wpointer-arith -Wno-uninitialized
>  -Wno-main -msoft-float -I. -I../../../../arch -I../../../.. -nostdinc
>  -DL2CR_CONFIG="(L2SIZ_1M|L2CLK_20|L2RAM_PIPELINE_BURST)" -DLKM
   ^here
>  -DDIAGNOSTIC -DTRAP_PANICWAIT -DNMBCLUSTERS="0x400" -DMAXUSERS=32
>  -D_KERNEL -Dmacppc -c ../../../../arch/macppc/macppc/cpu.c

regards,

-Mike