[U-Boot] File name substitution in linker scripts

I'm wondering if and how it's possible to use a "variable" file name for inclusion in a linker script. Reason for this is the consolidation of the ppc4xx linker scripts, where some boards (PPC440) include a board specific file (e.g. board/amcc/canyonlands/init.o) into the section "bootpg":

.bootpg RESET_VECTOR_ADDRESS - 0xffc : { cpu/ppc4xx/start.o (.bootpg) board/amcc/canyonlands/init.o (.bootpg) }

Is there a way to write something like this:

.bootpg RESET_VECTOR_ADDRESS - 0xffc : { cpu/ppc4xx/start.o (.bootpg) board/$(BOARDDIR)/init.o (.bootpg) }

in a linker script?

Thanks.

Cheers, Stefan

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