My question is to be able to boot from the USB OTG present on the USB C configured as a USB device. I believe it is possible with a Pi 4B and the latest Boot Eeeprom image but I've not tried it. There is an option 3 for the BOOT_ORDER setting which my notes say "USB device boot (usbboot))"...

It's in beta at the moment - please see the thread on this very forum about it. James clearly couldn't find the link to the related thread. https://www.raspberrypi.org/forums/viewtopic.php?p=1691224#p1691224 Thank you for your help, but I searched the forum before asking the question and I did not ...

On page https://www.raspberrypi.org/documentati ... /device.md RPI4 is not mentionned. As I understand it the feature is not actually supported for RPI4.
Is the USB device boot mode for RPI4 on the roadmap or it is not considered at this time ?

F.

What about the clock for LAN9512 ? Is it running ?

Hi you can try :
dtoverlay=sdio,poll_once=no,sdio_overclock=30

It works for me. But the problem may be in your hardware, you could share your schematic to check if it does not work.

F.

May be you should use a resistor bridge. If you put 3.3V in a resistor you will measure 3.3V whatever is the value of the resistor...

There is a guy named Wheatstone who could help you : https://en.wikipedia.org/wiki/Wheatstone_bridge

I would like to use eMMC for OS (on CM1 or CM3), then additional microSD only for storage

For this you don't need an external controller, the compute module can drive an external SDCARD (but can not boot from it). I used SD0 on GPIO[22..27] for this purpose and it works well.

This is used for HAT detection. But if you do not need this feature you can reuse them.

And also, we need the Ethernet connection. But there is no such connection on CMIO module. If someone have the schematic of the Ethernet connection, could you kindly send it to me for reference? The ethernet connection is made through a Lan9514 chip (USB Hub + Ethernet). You can find schematics of ...

The pannel you use is very high resolution, I'm not sure it is possible to drive it through MIPI DSI directly as the pannel requires 2 mipix4 and the CM3 has only 1x2 mipi and 1x4 mipi. You would need to put a scaler in the middle and drive it with a lower resolution or change the pannel for a lower...

- Why did not you go with IMX219 for sensor ? As Gavinmc42 said, main argument is that ov5647 is clonable because of missing crypto chip. Sice Amomthep doesn't use a camera board but raw camera chip, imx219 is no option. Another is price point, you can buy a v2 camera module for 25$, but a v1 camer...

Hi,

Nice work, I'm working on the same idea. Few questions :
- Why did not you go with IMX219 for sensor ?
- Very nice enclosure, where did you get it ?

The Raspberry Pi ecosystem is wonderful, having an open GPU with documentation is invaluable. Of course there is limitations CSI and DSI port are not really open and the closed ISP limit the choice of sensor usable for camera. The new camera based on Sony IMX219 could be really good, we could regret...

The touch screen is managed by the GPU. There is a special driver for it in Raspbian, I guess you need to port the driver to Linux-rt.

To the best of my knowledge the Pi Zero camera connector is the same as the CM connector. So a Pi Zero camera flex should work directly on CM.

Waiting for PI zero schematic to be sure.