oprofiler not producing proper samples,for MIPS 24K board

hi all,
i have installed a customized 2.6.21v kernel on a MIPS 24k core based board on which i have installed the default kernel profiler,oprofile.
Now when i start profiling thru commands given below everything goes fine,
the profiler package that i m using is oprofile-0.9.3

#opcontrol ––setup 
  ––vmlinux=/root/vmlinux  
  ––event=INSTRUCTIONS:100000:0:1:1

#opcontrol --start

SESSION_DIR /var/lib/oprofile
LOCK_FILE   /var/lib/oprofile/lock
SAMPLES_DIR /var/lib/oprofile/samples
CURRENT_SAMPLES_DIR /var/lib/oprofile/samples/current
CPUTYPE mips/24K
Profiler running.

(On this command the oprofiled daemon starts)

uclibc[~]# opcontrol --dump                     
SESSION_DIR /var/lib/oprofile
LOCK_FILE   /var/lib/oprofile/lock
SAMPLES_DIR /var/lib/oprofile/samples
CURRENT_SAMPLES_DIR /var/lib/oprofile/samples/current
CPUTYPE mips/24K

and after this command the sample files are also created,but
when i try to see the profile output i get

uclibc[~]# ouclibc[~]# opreport -l /root/vmlinux 
warning: /root/vmlinux could not be found.
CPU: MIPS 24K, speed 0 MHz (estimated)
Counted INSTRUCTIONS events (Instructions completed) with a unit mask of 0x00 (No unit mask) count 100000
samples  %        symbol name
4953     100.000  /root/vmlinux

uclibc[~]#

as shown above,the profiler is not able to show the details of what is going inside the vmlinux image,i.e,it does not shows the kernel-api and
other function call details ,which iit is supposed to show.

Kindly guide me,as to if i am missing something???