[yocto] Altera Cyclone V DTB origin

[Steffen Schuetz]

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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