Compiling Kernel Modules for Genode on iMX53 with TrustZone

Tue Nov 7 06:22:58 CET 2017

Hello Stefan,

Thank you for clearing that up. However, I have been trying to compile the
kernel and I am getting a lot of warnings and errors.
That is, I am trying to cross compile the linux kernel for the tz_vmm for
the imx53 on my VM runninng Ubuntu 16.04.
I made sure to read the Changes in the documentation folder and have the
required verisons of GNU, make, perl and perl modules as specified.
I have also been looking around on the Mailing List and there is a link
floating around to a guide for compiling the kernel for the tz_vmm scenario
but when I click it it tells me the page no longer exists.
That being said I do need to build the kernel to get the Module.symvers
file among others. I have tried using both the imx5_defconfig and
imx5_android_tz_defconfig but when I try to make I keep getting an error:

"Target processor does not support smc #0"

The commands I run look like this:
make ARCH=arm
CROSS_COMPILE=~/Documents/Genode/gcc-linaro-arm-none-eabi-4.9-2014.09_linux/bin/arm-none-eabi-
distclean

make ARCH=arm
CROSS_COMPILE=~/Documents/Genode/gcc-linaro-arm-none-eabi-4.9-2014.09_linux/bin/arm-none-eabi-
imx5_defconfig

make ARCH=arm
CROSS_COMPILE=~/Documents/Genode/gcc-linaro-arm-none-eabi-4.9-2014.09_linux/bin/arm-none-eabi-

Where the cross compiler is from the Genode toolchain.

I recently ran into the thread "Building Genode for Linux/ARM" [1]  and
there it says that the linux platforms do not support cross-compiling, but
I think what they are doing is different? Otherwise, is this still true? If
so, if I want to compile the kernel myself would I have to go through the
process they did using qemu?
I am new to this so sorry if these questions are not the best or missing
information.
Any help would be appreciated.

[1] https://sourceforge.net/p/genode/mailman/message/34123311/

Thank you,

Mauricio

On Wed, Oct 25, 2017 at 6:04 AM, Stefan Kalkowski <
stefan.kalkowski at ...1...> wrote:

> Hi Mauricio,
>
> On 10/25/2017 12:39 AM, Mauricio Gutierrez Barnett wrote:
> > Hello,
> >
> > I have a question about adding kernel modules to the Genode OS.
> >
> > So I have built and boot the tz_vmm scenario for platform
> > hw_imx53_qsb_tz on the i.MX53 development board using another thread on
> > this mailing list as a guide. I was able to get it up and running on the
> > board with no problems.
> > However, I need to install a kernel module into the normal world linux.
> > In order to do this I need to be able to cross compile the module for
> > the target kernel running in normal world from my desktop.
> > However, while I have access to the target compiler I do not have a
> > target kernel directory.
> > That is, only the final image of linux is provided, not the source code
> > used to compile it.
>
> it is available. I referred to it several times on this mailing list.
> The Linux kernel used within the tz_vmm.run test script was built using
> the following Linux kernel branch, which is slightly modified to not
> crash within the normal world based on the official sources provided by
> Freescale:
>
>   https://github.com/skalk/linux/tree/imx53-tz
>
> > I know the version is provided as Linux version 2.6.35.3-01270-g9533414.
> > However, if I try to use the 2.6.35.3-generic version as a target I get
> > a symbol version error when I try to insmod:
> >
> > "disagrees about version of symbol kmalloc_caches
> > Unknown symbol kmalloc_caches (err -22)"
> >
> > I believe this is because the kernel running in the normal world has
> > been modified.
>
> The Freescale sources and vanilla Linux sources are quite different from
> each other. I assume it clashes therefore.
>
> Regards
> Stefan
>
> > I am wondering if there is another way for me to compile kernel modules
> > for Genode. If not, would it be possible for you to release the source
> > code of your modified kernel which you used to create the Linux Image
> > that runs in the normal world?
> >
> > Thank you for your time,
> >
> > Mauricio Gutierrez
> >
> >
> > ------------------------------------------------------------
> ------------------
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> >
> >
> >
> > _______________________________________________
> > genode-main mailing list
> > genode-main at lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/genode-main
> >
>
> --
> Stefan Kalkowski
> Genode Labs
>
> https://github.com/skalk · http://genode.org/
>
> ------------------------------------------------------------
> ------------------
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