커널을 컴파일하던 중 다음과 같은 에러가 발생했습니다.

어떤 경우에 이와 같은 메시지가 나올 수 있는지요.

arm-linux-ld -p -X -T arch/arm/vmlinux.lds arch/arm/kernel/head-armv.o
arch/arm/kernel/init_task.o init/main.o init/version.o
--start-group
arch/arm/kernel/kernel.o arch/arm/mm/mm.o arch/arm/mach-
sa1100/sa1100.o kernel/kernel.o mm/mm.o fs/fs.o ipc/ipc.o
drivers/char/char.o drivers/block/block.o drivers/misc/misc.o
drivers/net/net.o drivers/media/media.o drivers/video/video.o
net/network.o
arch/arm/nwfpe/math-emu.o arch/arm/lib/lib.a /tmp/kernel247-
ipsec6/linux/lib/lib.a /usr/local/lib/gcc-lib/arm-linux/2.95.3/libgcc.a
--end-group
-o vmlinux
arch/arm/kernel/kernel.o: In function `reschedule':
arch/arm/kernel/kernel.o(.text+0x4a0): undefined reference to `schedule'
fs/fs.o: In function `jffs2_read_super':
fs/fs.o(.text+0x64eb4): undefined reference to `__get_mtd_device'
make: *** [vmlinux] Error 1