Rainbow Screen on raspberry pi 3

tshade · n00b Joined: 01 Oct 2007 Posts: 21

Hello,

I am getting a rainbow screen on a raspberry pi 3. I am following these instructions:

https://wiki.gentoo.org/wiki/Raspberry_Pi

Just finished compiling everything. But no luck. The kernel seems not to get loaded by the raspberry board.

I am also following the most valued answer here:

http://raspberrypi.stackexchange.com/questions/19354/raspberry-pi-with-boots-up-with-rainbow-screen

Any hints?

bbgermany · Posted: Fri Jan 06, 2017 6:20 am Post subject:

Hi,

i got this a few days ago as well. Solution in my case was to get the stock config.txt/cmdline.txt from an Raspbian image and install these.

Maybe this helps you as well.

greets, bb
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antonlacon · Apprentice Joined: 27 Jun 2004 Posts: 257

On the RPi3, I believe the kernel needs to be called kernel7.img to boot. You'd need to post the contents of your /boot partition to get better guidance.

If you're just starting it up, you'll probably have an easier time installing raspberrypi-firmware, and raspberrypi-image. This is the firmware and kernel from the Raspberry Pi org's github releases.

NeddySeagoon · Posted: Sun Jan 08, 2017 3:13 pm Post subject:

tshade,

Try with all the automatics first.
If you have a config.txt and cmdline.txt, rename them so that they are not found, we will come back to them later.

For 32 bit operation, the kernel file needs to be called kernel7.img
I'll pretend that 64 bit operation is not an option meanwhile :)
You also need bcm2710-rpi-3-b.dtb. That's the device tree binary.

At startup the ARM CPU is held reset while the GPU runs bootcode.bin
bootcode.bin has some sensible defaults preset but can be overridden by config.txt.
config.txt can do lots of things to prevent booting too, so lets not use it

fixup * and start* are required too.

bootcode.bin loads kernel7.img and bcm2710-rpi-3-b.dtb, then lets the ARM CPU go, which starts the kernel.
bcm2710-rpi-3-b.dtb describes the hardware to the kernel, if that's missing or incorrect, the kernel cannot control the hardware.

That's all that required to get kernel messages. Mounting root is an excercise for another day.
With that bare minimal setup. the rainbow should go away, the kernel start but I would not expect root to mount.

Try that and post the Pis