problem with creating a kernel module program for angstrom os

[siva kumar]

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!!!!

 

[Brandon I]

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.

[siva kumar]

thanks for your reply 

yes , u r right  i compiled the module against arm-angstrom-linux-gnueabi-gcc but my angstrom os comes with Linaro gcc 

root@beaglebone:~# opkg list_installed | grep gcc

gcc - linaro-4.7-r9.2

gcc-symlinks - linaro-4.7-r9.2

libgcc-s-dev - linaro-4.7-r9.0

libgcc1 - linaro-4.7-r9.0

perl-module-extutils-cbuilder-platform-windows-gcc - 5.14.2-r13.1

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

i done the following steps to update my modules for my board .but it says  my kernel headers are up to date.

root@beaglebone:~#  opkg install kernel-headers

Package kernel-headers (3.8.13-r23a.22) installed in root is up to date.

[1] what should i do to get my modules to work with??

[Brandon I]

Just a regular kernel type makefile. For examlpe, here's mine for a file phyaccess.c

BEAGLEBONE_PROJ=/systems/Projects/beaglebone/workspace/Beaglebone

MDIO_ROOT=$(BEAGLEBONE_PROJ)/local/MDIODriver

#http://stackoverflow.com/questions/10176238/how-do-i-add-an-include-path-for-kernel-module-makefile

# for kernel module make uses kbuild. Paths have to be absolute, not relative.

EXTRA_CFLAGS+=-I$(MDIO_ROOT)/include -I$(MDIO_ROOT) -I$(BEAGLEBONE_PROJ)/include -I$(BEAGLEBONE_PROJ)/Interface/local/include -Werror

obj-m += phyaccess.o

all:

make -C $(KERNELDIR) M=$(PWD) modules

clean:

make -C $(KERNELDIR) M=$(PWD) clean

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[Brandon I]

Missed first line on that copy paste. Should be

KERNELDIR := /usr/src/kernel

[siva kumar]

hai,

 thank u!!

but  my  folder structure from my board looks like

root@beaglebone:/usr/src# ls

backfire  linux-3.8.13

root@beaglebone:/usr/src# cd linux-3.8.13/

root@beaglebone:/usr/src/linux-3.8.13# ls

include

root@beaglebone:/usr/src/linux-3.8.13/include# ls

asm  asm-generic  drm  linux  mtd  rdma  scsi  sound  uapi  video  xen

root@beaglebone:/usr/src/linux-3.8.13/include/linux# ls

byteorder  dvb isdn    netfilter_arp     netfilter_ipv6  spi     tc_ematch

caif   hdlc  mmc    netfilter_bridge  nfsd      sunrpc  usb

can   hsi netfilter  netfilter_ipv4    raid      tc_act  wimax

root@beaglebone:/usr/src/linux-3.8.13/include/linux# 

this info shows that my board shipped with no module support by default ..!!!

now question is 

[1] still i didn't update or upgraded my angstrom os ..shall i need to do or is there any other way to insert my hello_world.ko module into my board??

i found 1 more link for installing  the module libs sturcture and soure into the running os . here the link

http://wiki.replicape.com/index.php?title=Compiling_the_kernel

will this link  help me to insert also to create  a modules without fail ..

can you suggest your opinion..pls..

 
regards

siva

[Brandon I]

Did you install the kernel-dev package?

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