[linux-yocto] Missing Kernel Modules (GPU folder and radeon.ko)

Bruce Ashfield bruce.ashfield at windriver.com
Tue Jun 23 13:16:55 PDT 2015

On 2015-06-23 11:27 AM, Chen, Simon wrote:
> Hi all,
> I am trying to integrate the AMD Radeon E8860 graphics card on to a
> Yocto (poky-dizzy-12.0.1) embedded machine. Ialready have the open
> source xf86-video-ati driver (7.4.0) installed into my Yocto image. The
> problem is that the kernel module radeon.ko, and all of its dependencies
> under the GPU and I2C folders seems to be missing from the kernel.
> Without these .ko files, Yocto cannot recognize the external graphics
> card, and udev cannot generate an appropriate device node
> (/dev/dri/card0) for Xorg to use.
> I’ve already tried adding the following line to my local.conf:
> CORE_IMAGE_EXTRA_INSTALL_append = "kernel-modules"

How are you invoking the rebuild of the kernel modules after you've
added them via menuconfig ?

kernel-modules is a meta package that has embedded RDEPENDS on
individual kernel module packages. If you are rebuilding the kernel,
but not re-building and repacking the kernel modules then any additions
won't be in the RDEPENDS and hence won't make it to the image.


> This populates the file system with .ko’s but none seem to be the ones I
> need for my graphics card to run, which are radeon.ko, drm.ko,
> drm_kms_helper.ko, ttm.ko, and i2c_algo_bit.ko. I am missing the entire
> lib/modules/<KERNEL_VERSION>/kernel/drivers/gpu folder and also most of
> the contents in lib/modules/<KERNEL_VERSION/kernel/drivers/i2c.
> I wondered if it was just a matter of implementing the .config file
> correctly. But I’ve already executed “$bitbake linux-yocto –c menconfig”
> and enabled the appropriate configuration flags for each of these
> modules. Perhaps this just a matter of appending to the kernel.bbclass
> file which is responsible for executing the kernel Makefiles, and
> building these .ko’s?
> Can you guys please check your own lib/modules/<KERNEL_VERSION>/kernel
> directory to see that these .ko’s exist? I’d like to know if there is
> something else that isn’t enabled or included into the build, or if it’s
> something I need to hardcode in order to fix this issue.
> Thanks,
> Simon

More information about the linux-yocto mailing list