[yocto] Altera Cyclone V DTB origin

[Steffen Schuetz]

Hi,

I found that the dtb is obtained from a git reposirtory during the build
and stored under
build/tmp/work/socfpga_cyclone5-poky-linux-gnueabi/linux-altera-ltsi/3.10-r1/git/arch/arm/boot/dts/
I succesfully build a custom dtb following these suggestions:
https://community.freescale.com/thread/325219

Is there a way to do this using a bitbake mechanism?

Thanks!

Best Regards,
Steffen

On 05/18/2015 11:41 AM, Steffen Schuetz wrote:
> Hi,
>
> I build a customized Linux image using Yocto Daisy - we need gcc >= 4.8
> - following the instructions at
> http://rocketboards.org/foswiki/Documentation/YoctoDoraBuildWithMetaAltera .
> Besides the zImage and rootfs the build process outputs an .dtb file.
> Now, in order to get the FPGA fabric involved, I'd have to come up with
> a modified dts and build it.
> That's where I'm a bit lost in the blur. I can not figure out where the
> generated dtb is coming from? What's the mechanism behind? I cannot find
> any .dts nor .dtb in the meta-altera layer.
>
> Besides that I realized that if I use the dtb that shipped with the
> board with the "daisy" kernel, the boot process gets stuck at "Waiting
> for root device /dev/mmcblk0p3..." The "shipped" kernel is version 3.8.0
> while the "daisy" one is 3.10.31-ltsi.
> Was there a change in the device tree layout as the "old" one doesn't
> work with the "daisy" kernel?
>
>
> Thanks in advance!
>
> Regards,
> Steffen


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