[android-kernel] Re: Loadable Kernel Module

[Chew Esmero]

Yes, it is possible. Exec Format Error: it seems that your module is
not built using the headers of your goldfish kernel. Try this simple
makefile when building your new driver (assuming hello.c as source):

obj-m := hello.o

CROSS_COMPILE=arm-eabi-
KERNEL_DIR ?= ~/goldfish/kernel/

all:
        $(MAKE) -C $(KERNEL_DIR) M=`pwd` ARCH=arm CROSS_COMPILE=$
(CROSS_COMPILE) modules

clean:
        rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions
modules.order Module.symvers Module.markers

You need to take note that you need to export first CROSS_COMPILE
variable to your current shell. (i.e. #export CROSS_COMPILE=~/<your-
android-dir>/prebuilt/linux-x86/toolchain/arm-eabi-4.3.1/bin) Then you
issue the command #make. I think this will resolve the Exec Format
Error problem.

As for the 'operation not permitted' problem in #insmod, it seems that
the "Loadable Module Support" in your goldfish's kernel config is
still not enabled. You can try this:

<goldfish-kernel># ARCH=arm make goldfish_defconfig
<goldfish-kernel># ARCH=arm make menuconfig

[*] Enable loadable module support ---> (make sure to have this one)

<goldfish-kernel># ARCH=arm ARCH=arm CROSS_COMPILE=arm-eabi- make

Your final kernel will be arch/arm/boot/zImage. After booting emulator
using that kernel, you can now do your #insmod in emulator shell.

Hope that helps.


On Oct 29, 1:01 pm, perumal316 <perumal...@gmail.com> wrote:
> Thanks,Yes, now it can be loaded when the emulator is booted with the
> new kernel.
> But must I always build the module against my new kernel and boot with
> the new kernel to load a new module?
> Is it possible to insmod <module>, similar like in Linux to load a
> module?
> I have tried in emulator's terminal and in shell but keep on getting
> the "init module failed, Exec Format Error or init module
> failed,operation not permitted" error messages.
>
> Regards,
> Perumal
>
> On Oct 20, 9:06 pm, Chew Esmero <chew.esm...@gmail.com> wrote:
>
>
>
> > Did you build the module against your new kernel? (i.e. ARCH=arm
> > KERNEL_DIR=<android-root-dir>/kernel make). I've encountered that
> > error message before and it seems that the booted kernel still do not
> > allow "Enable Loadable Module" .config support. Are you sure emulator
> > is booted with the new kernel? (i.e. emulator -kernel <new-kernel> -
> > show-kernel -avd <name-of-avd>)
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