thanks for your reply brandon I

its hard for me to update kernel-source for my bbb. when i execute the 
command it always says
root@beaglebone:~#  opkg install kernel-headers
Package kernel-headers (3.8.13-r23a.22) installed in root is up to date.

when i look inside the /lib/modules/3.8.13/build/ no source files yet 
available. 
what shall i do ..to insert a  module program..
right now  my beagle bone black comes with following specifications
root@beaglebone:~# dmesg | head
[ 0.000000] Booting Linux on physical CPU 0×0
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000]* Linux version 3.8.13 (koen@rrMBP) (gcc version 4.7.3 20130205 
(prerelease) (Linaro GCC 4.7-2013.02-01) ) #1 SMP Tue Jun 18 02:11:09 EDT 
2013*
[ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=50c5387d
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing 
instruction cache
[ 0.000000] Machine: Generic AM33XX (Flattened Device Tree), model: TI 
AM335x BeagleBone
[ 0.000000] Memory policy: ECC disabled, Data cache writeback
[ 0.000000] On node 0 totalpages: 130816
[ 0.000000] free_area_init_node: node 0, pgdat c0688d80, node_mem_map 
c06e4000
[ 0.000000] Normal zone: 1024 pages used for memmap

is it necessary to update my os or i can do my module programs by simply 
updating codes inside.!!1

On Saturday, 8 March 2014 02:42:31 UTC+5:30, Brandon I wrote:
>
> dmesg will give you more details.
>
> This usually means you compiled the kernel modules against a different 
> build of the kernel. So, the kernel source you used didn't match what was 
> on the beaglebone.
>
> You can install the kernel-headers and kernel-dev packages and build 
> directly on the beaglebone. For some time, these packages weren't in sync 
> with the actual kernel installed...as always, good luck with Angstrom.
>
> On Thursday, March 6, 2014 10:30:41 PM UTC-8, siva kumar wrote:
>>
>> hello,
>>
>> i recently purchased beagle bone black . my bbb come with pre compiled 
>> angstrom os( Angstrom v2012.12 - Kernel 3.8.13) still i didn't  updated my 
>> os 
>> i try to test my board with simple hello module program . but when i 
>> insert a module i got the error message 
>> root@beaglebone:~# insmod hello.ko
>> Error: could not insert module hello.ko: Invalid module format
>> root@beaglebone:~# 
>>
>> i compiled the module program from my host pc against 
>> arm-angstrom-linux-gcc compiler..and i transferred the hello.ko file via 
>> scp protocol.
>>
>>   
>>
>> my question is 
>> [1] Is it possible to add  a module  program with my available angstrom 
>> os..if yes what should i do to insert  modules????
>> [2] what are all the basic things needed to insert a module??
>>
>>
>> help me to better understand the beagle bone black!!!!
>>  
>>
>

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