title: failing on running coffee file system example on Wismote in Contiki
body: <p>I want to test an example of cfs Contiki on Wismote. I used the example here:
  <a href="https://github.com/contiki-os/contiki/wiki/Coffee-filesystem-example" rel="nofollow noreferrer">Coffee filesystem example</a></p>
  
  <p>This example works well on sky mote. when I want to implement on Wismote I change the target to Wismote and here is the makefile :</p>
  
  <pre><code>CONTIKI_PROJECT = [project_name]
  all: $(CONTIKI_PROJECT)
  
  #UIP_CONF_IPV6=1
  CONTIKI_WITH_RIME = 1   CFLAGS =-DUIP_CONF_IPV6
  MODULES += core/net/ipv6/multicast
  
  ifeq ($(TARGET),avr-raven)
  COFFEE_FILES = 4
  endif 
  
  CONTIKI =../../../
  include $(CONTIKI)/Makefile.include
  </code></pre>
  
  <p>After compiling, I get this error message :</p>
  
  <blockquote>
    <p>/usr/local/msp430/bin/../lib/gcc/msp430/4.7.0/../../../../msp430/bin/ld: cfstest.wismote section <code>.data' will not fit in region</code>rom'
    /usr/local/msp430/bin/../lib/gcc/msp430/4.7.0/../../../../msp430/bin/ld: section .vectors loaded at [0000ff80,0000ffff] overlaps section .data loaded at [0000fe82,0000ff81]
    /usr/local/msp430/bin/../lib/gcc/msp430/4.7.0/../../../../msp430/bin/ld: region <code>rom' overflowed by 2 bytes
    contiki-wismote.a(cfs-coffee.o): In function</code>cfs_coffee_get_protected_mem':
    /home/user/contiki/examples/mySim/Dscv/../../..//core/cfs/cfs-coffee.c:1369: undefined reference to <code>xmem_pread'
    /home/user/contiki/examples/mySim/Dscv/../../..//core/cfs/cfs-coffee.c:1369: undefined reference to</code>xmem_pread'
    /home/user/contiki/examples/mySim/Dscv/../../..//core/cfs/cfs-coffee.c:1369: undefined reference to <code>xmem_pwrite'
    /home/user/contiki/examples/mySim/Dscv/../../..//core/cfs/cfs-coffee.c:1369: undefined reference to</code>xmem_erase'
    /home/user/contiki/examples/mySim/Dscv/../../..//core/cfs/cfs-coffee.c:1369: undefined reference to <code>xmem_pread'
    /home/user/contiki/examples/mySim/Dscv/../../..//core/cfs/cfs-coffee.c:1369: undefined reference to</code>xmem_pread'
    /home/user/contiki/examples/mySim/Dscv/../../..//core/cfs/cfs-coffee.c:1369: undefined reference to <code>xmem_pread'
    /home/user/contiki/examples/mySim/Dscv/../../..//core/cfs/cfs-coffee.c:1369: undefined reference to</code>xmem_pread'
    /home/user/contiki/examples/mySim/Dscv/../../..//core/cfs/cfs-coffee.c:1369: undefined reference to <code>xmem_pwrite'
    /home/user/contiki/examples/mySim/Dscv/../../..//core/cfs/cfs-coffee.c:1369: undefined reference to</code>xmem_pread'
    /home/user/contiki/examples/mySim/Dscv/../../..//core/cfs/cfs-coffee.c:1369: undefined reference to <code>xmem_pread'
    /home/user/contiki/examples/mySim/Dscv/../../..//core/cfs/cfs-coffee.c:1369: undefined reference to</code>xmem_pwrite'
    /home/user/contiki/examples/mySim/Dscv/../../..//core/cfs/cfs-coffee.c:1369: undefined reference to <code>xmem_pwrite'
    /home/user/contiki/examples/mySim/Dscv/../../..//core/cfs/cfs-coffee.c:1369: undefined reference to</code>xmem_pwrite'
    /home/user/contiki/examples/mySim/Dscv/../../..//core/cfs/cfs-coffee.c:1369: undefined reference to `xmem_pwrite'
    collect2: error: ld returned 1 exit status
    rm cfstest.co obj_wismote/contiki-wismote-main.o
    make: *** [cfstest.wismote] Error 1
    Process returned error code 2</p>
  </blockquote>
  
  <p>I checked core/cfs/cfs-coffee.c to see the code in line 1369, but as you can see in <a href="https://github.com/contiki-os/contiki/blob/master/core/cfs/cfs-coffee.c" rel="nofollow noreferrer">cfs-coffee.c</a>, there was not such a line.
  Does anyone has any idea to solve the problem?</p>