[Yaffs] Undefined reference

Hello,

I have arm board with a Toshiba 128MB NAND flash which
is 528bytes/page.
I downloaded the newest yaffs code and patch it to
linux kernel 2.6.11.10. I select yafss and mtd support
from muneconfig. After make, I got the error messages
at the end:

  CHK     include/linux/version.h
make[1]: `arch/arm/kernel/asm-offsets.s' is up to
date.
make[1]: `include/asm-arm/mach-types.h' is up to date.
  CHK     include/linux/compile.h
  CHK     usr/initramfs_list
  CC      fs/yaffs/yaffs_fs.o
fs/yaffs/yaffs_fs.c:167: warning: initialization from
incompatible pointer type
fs/yaffs/yaffs_fs.c: In function
`yaffs_internal_read_super':
fs/yaffs/yaffs_fs.c:1279: warning: `dev' might be used
uninitialized in this function
fs/yaffs/yaffs_fs.c: At top level:
fs/yaffs/yaffs_fs.c:689: warning: `yaffs_file_read'
defined but not used
fs/yaffs/yaffs_fs.c:1491: warning:
`yaffs_internal_read_super_ram' defined but not used
fs/yaffs/yaffs_fs.c:1561: warning:
`my_proc_ram_write_entry' defined but not used
fs/yaffs/yaffs_fs.c:1635: warning:
`yaffs_proc_ram_write' defined but not used
  CC      fs/yaffs/yaffs_mtdif.o
  LD      fs/yaffs/yaffs.o
  LD      fs/yaffs/built-in.o
  LD      fs/built-in.o
  GEN     .version
  CHK     include/linux/compile.h
  UPD     include/linux/compile.h
  CC      init/version.o
  LD      init/built-in.o
  LD      .tmp_vmlinux1
fs/built-in.o(.text+0x7dac0): In function
`yaffs_internal_read_super':
: undefined reference to `nandmtd_WriteChunkToNAND'
fs/built-in.o(.text+0x7dac4): In function
`yaffs_internal_read_super':
: undefined reference to `nandmtd_ReadChunkFromNAND'
fs/built-in.o(.text+0x7dac8): In function
`yaffs_internal_read_super':
: undefined reference to `nandmtd_EraseBlockInNAND'
fs/built-in.o(.text+0x7dacc): In function
`yaffs_internal_read_super':
: undefined reference to `nandmtd_InitialiseNAND'
make: *** [.tmp_vmlinux1] Error 1

yaffs_mtdif does compile which include the 4 undefined
functions. But why does it complain about the 4
functions.


        
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