Hi Peeratham,

On Wed, Jan 25, 2017 at 09:45:16PM -0500, Peeratham Techapalokul wrote:
> Hello,
>
> My name is Peeratham and I'm new to OP-TEE.
> I'm trying to setup OP-TEE on Raspberry Pi3. I was able to build and create
> a bootable sd card. It was booting up with these message (captured using my
> phone, just in case it might help with troubleshooting):
>
> ==========================================
>
> JTAG (gpio) enabled
> Net: Net Initialization Skipped
> No ethernet found.
> Hit any key to stop autoboot: 0
> reading Image
> 10220544 bytes read in 868 ms (11.2 MiB/s)
> reading bcm22710-rpi-3-b.dtb
> 13376 bytes read in 19 ms (687.5 KiB/s)
> reading optee.bin
> 362824 bytes read in 47 ms (7.4 MiB/s)
> ## Flattened Device tree blob at 01700000
> Booting using the fdt blob at 0x1700000
> reserving fdt memory region: addr=0 size=1000
> reserving fdt memory region: addr=8000000 size=2000000
> Loading Device tree to 0000000039f2d000, end 0000000039f3343f ... OK
>
> Starting kernel ...
> ## Transferring control to ARM TF (at address 8400000) (dtb at 39f2d000)...
>
> ==========================================
>
>
> but then the next screen appears with Raspberry graphics up top and a
> blinking cursor.
>
> And the shell never comes up. So I was not able to continue with the rest
> of the steps in
> https://github.com/OP-TEE/build/blob/master/docs/rpi3.md#3-build-instructions
>
>
> Do you have any suggestions to get this to work?
>

How are you connecting to the device? UART cable? HDMI? With UART cable
I have no issues at all, I just tried a setup from scratch and all works
as it should. With HDMI cable you will probably just see "four"
raspberries and a blinking cursor as you're saying. The reason for that
is that the root fs we're using in our setup is a simple initramfs with
no X environment and basically no drivers etc, and even though it should
be possible to get a console with HDMI (with no X environment) it's
nothing we've looked into as of now (and have no real plans to do so).

Having that said Sequitur Labs have put together images etc based on the
Raspbian images. I'm not 100% sure if all that is publicly available.
But, Philip from Sequitur Labs hold a Webinar about it and their setup.
Their presentation is available at YouTube here:
https://youtu.be/aMdo-Sx1rVU

My suggestion for now would be to try to make your own UART cable.
https://github.com/OP-TEE/build/blob/master/docs/rpi3.md#61-debug-cable--uart-cable

You of course don't need all the JTAG stuff, so you can just plug the
UART pins directly into the correct PINs on the RPi3 itself. I.e, there
is need to buy the 20-pin JTAG connector etc just for the UART.

--
Regards,
Joakim