2.4.21-bk25 -- agpgart_be.c:95:2: #error "Please define flush_cache."

make[4]: Entering directory `/home/usr/src/linux-2.4.21/drivers/char/agp' gcc -D__KERNEL__ -I/home/usr/src/linux-2.4.21/include -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing -fno-common -fomit-frame-pointer -I/home/usr/src/linux-2.4.21/arch/ppc -fsigned-char -msoft-float -pipe -ffixed-r2 -Wno-uninitialized -mmultiple -mstring -nostdinc -iwithprefix include -DKBUILD_BASENAME=agpgart_be -DEXPORT_SYMTAB -c agpgart_be.c
agpgart_be.c:95:2: #error "Please define flush_cache." agpgart_be.c:401: warning: agp_generic_agp_enable' defined but not used agpgart_be.c:494: warning: agp_generic_create_gatt_table' defined but not used
agpgart_be.c:618: warning: agp_generic_suspend' defined but not used agpgart_be.c:623: warning: agp_generic_resume' defined but not used agpgart_be.c:628: warning: agp_generic_free_gatt_table' defined but not used agpgart_be.c:680: warning: agp_generic_insert_memory' defined but not used agpgart_be.c:742: warning: agp_generic_remove_memory' defined but not used agpgart_be.c:759: warning: agp_generic_alloc_by_type' defined but not used agpgart_be.c:764: warning: agp_generic_free_by_type' defined but not used agpgart_be.c:782: warning: agp_generic_alloc_page' defined but not used agpgart_be.c:802: warning: `agp_generic_destroy_page' defined but not used make[4]: *** [agpgart_be.o] Error 1

Is this happening because the LinuxPPC folks haven't put Uninorth AGP support in yet?

CONFIG_AGP=y
CONFIG_DRM=y
CONFIG_DRM_NEW=y
CONFIG_DRM_RADEON=y