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by gsh
Mon Sep 24, 2018 2:48 pm
Forum: Compute Module
Topic: CM3 and CM1 SDX_VREF question
Replies: 4
Views: 62

Re: CM3 and CM1 SDX_VREF question

No you need to connect pins 4 and 6 of your compute module connector to 3.3v that is not the same as GPIO4 and GPIO6 (pins 15 and 21 respectively)
by gsh
Mon Sep 24, 2018 12:46 pm
Forum: Compute Module
Topic: Carrier Board RPI CM3 USB_OTGID help?
Replies: 6
Views: 113

Re: Carrier Board RPI CM3 USB_OTGID help?

You do not need a pullup on the OTG_ID line, the pin on the 2835/6/7 has one integrated. Just wire the USB_OTGID pin to pin 4 on the uUSB connector.

You will need a 100k pullup to 1v8 on the HDMI_HPD_N_1V8 line
by gsh
Mon Sep 24, 2018 12:39 pm
Forum: Compute Module
Topic: CM3 and CM1 SDX_VREF question
Replies: 4
Views: 62

Re: CM3 and CM1 SDX_VREF question

There is a jumper on CM3 lite to connect this supply to the device, so you don't require an external switch. You should follow the CMIO3 PCB schematics in this respect

Gordon
by gsh
Mon Sep 24, 2018 8:39 am
Forum: Compute Module
Topic: Carrier Board RPI CM3 USB_OTGID help?
Replies: 6
Views: 113

Re: Carrier Board RPI CM3 USB_OTGID help?

I would suggest you check the CMIO schematic for the pullup connection and value.
by gsh
Fri Sep 21, 2018 2:35 pm
Forum: Compute Module
Topic: Carrier Board RPI CM3 USB_OTGID help?
Replies: 6
Views: 113

Re: Carrier Board RPI CM3 USB_OTGID help?

If you're happy with software solution then you can ignore the OTG_ID pin completely and just add dr_mode=peripheral to the dtoverlay line dtoverlay=dwc2,dr_mode=peripheral Otherwise if you want to be able to use the special host cable in the uUSB plug so you can use OTG to switch between host and d...
by gsh
Tue Sep 11, 2018 3:22 pm
Forum: Compute Module
Topic: scriptexecutor problem
Replies: 15
Views: 578

Re: scriptexecutor problem

If you had a 1V8 pullup then it wouldn't be detecting any HDMI, and therefore, it wouldn't try reading EDID...

Try adding hdmi_ignore_edid=1 to config.txt that should stop it from reading the EDID

Gordon
by gsh
Tue Sep 11, 2018 10:32 am
Forum: Compute Module
Topic: scriptexecutor problem
Replies: 15
Views: 578

Re: scriptexecutor problem

Do you have the same response on a CMIO3 board?
by gsh
Tue Sep 11, 2018 9:06 am
Forum: Compute Module
Topic: scriptexecutor problem
Replies: 15
Views: 578

Re: scriptexecutor problem

Do you have a pullup to 1v8 on HDMI_HPD_N_1V8
by gsh
Mon Sep 10, 2018 1:53 pm
Forum: Compute Module
Topic: scriptexecutor problem
Replies: 15
Views: 578

Re: scriptexecutor problem

Just rebuild it and use the latest firmware
by gsh
Sun Sep 09, 2018 6:20 pm
Forum: Compute Module
Topic: scriptexecutor problem
Replies: 15
Views: 578

Re: scriptexecutor problem

You could try enabling the UART output on bootcode.bin using strings bootcode.bin | grep BOOT_UART=0 Should give you BOOT_UART=0 by default on a clean recent bootcode.bin (if I've got this wrong it may be UART_BOOT instead), then do: sed -i -e "s/BOOT_UART=0/BOOT_UART=1/" bootcode.bin This should en...
by gsh
Wed Sep 05, 2018 2:20 pm
Forum: Compute Module
Topic: Unable to flash the eMMC on a Compute Module
Replies: 3
Views: 199

Re: Unable to flash the eMMC on a Compute Module

Does rpiboot complete successfully if you run it from the command line?

Have you tried running etcher to detect the device
by gsh
Tue Aug 28, 2018 2:30 pm
Forum: Compute Module
Topic: Compute module lite not booting (LED on then off)
Replies: 32
Views: 605

Re: Compute module lite not booting (LED on then off)

I'd suggest you read through the CMIO schematics in terms of the module boot options and make sure that you're reproduced this circuit correctly, R10 is there to make sure EMMC_EN_N_1V8 can't float...

Gordon
by gsh
Tue Aug 28, 2018 10:08 am
Forum: Add-ons
Topic: POE Hat - possible boot loader issue
Replies: 7
Views: 489

Re: POE Hat - possible boot loader issue

The positive is that it does get to the splash screen which means whatever it is, it's not a problem with the hardware! Should be software fixable!

Gordon
by gsh
Thu Aug 23, 2018 8:24 am
Forum: Compute Module
Topic: Compute module lite not booting (LED on then off)
Replies: 32
Views: 605

Re: Compute module lite not booting (LED on then off)

aBUGSworstnightmare wrote:
Thu Aug 23, 2018 7:55 am
Rick123,
your LCD is connected to DPI Interface, right? Which Kind of connector is on your PCB (i.e. FFC connector)?

DPI_10 (=GPIO14) and DPI_11(=GPIO15) are the pins required for the UART. So it should be possible to debug.
Good point, you do have access to the UART...
by gsh
Thu Aug 23, 2018 8:23 am
Forum: Compute Module
Topic: Compute module lite not booting (LED on then off)
Replies: 32
Views: 605

Re: Compute module lite not booting (LED on then off)

Questions: 1. Is the boot log you requested to post here on the uSD card? No, it is only output during the second stage booting process and only to UART. So it is not possible to debug with this 2. If after switching off the previous boot log remains then I could just copy that file using a uSD car...
by gsh
Wed Aug 22, 2018 10:21 am
Forum: Compute Module
Topic: Flashing EMMC via RPI zero w stuck waiting for connection
Replies: 5
Views: 193

Re: Flashing EMMC via RPI zero w stuck waiting for connection

Yes, the Pi Zero is very sensitive to the cable (I say sensitive, the spec says the impedance should be 90R differential and these were more like 50R, so it's completely wrong, but a PC doesn't have a problem with the same cable)

Gordon
by gsh
Tue Aug 21, 2018 3:53 pm
Forum: Compute Module
Topic: Compute module lite not booting (LED on then off)
Replies: 32
Views: 605

Re: Compute module lite not booting (LED on then off)

I also had a look at the link from Gordon but although I have experience in firmware development, I have practically none when it comes to the RaspPI/CM. Any other way to figure out what it could be? Just enable the UART boot and get the boot log out of the device. Then attach here and we'll be abl...
by gsh
Tue Aug 21, 2018 6:27 am
Forum: Compute Module
Topic: Is there a way to monitor the CM3 using USB micro?
Replies: 11
Views: 374

Re: Is there a way to monitor the CM3 using USB micro?

The CMIO board has a pull down on the OTGID pin, I think this is what I would term a 'bad decision' from my point! R12 is a 1K pull down. I would suggest removing this resistor, the chip has an internal pull up on it... Then leave the OTGID pin unconnected for device (peripheral) mode and ground it ...
by gsh
Tue Aug 21, 2018 6:17 am
Forum: Compute Module
Topic: Flashing EMMC via RPI zero w stuck waiting for connection
Replies: 5
Views: 193

Re: Flashing EMMC via RPI zero w stuck waiting for connection

I would guess it's a problem with the USB cable you're using. I've had a bit of trouble with cheap cables made only very slightly of copper! Especially for some reason with the Pi Zero. Can you try on a PC or a Raspberry Pi first? This will tell you if there's a hardware problem at least... Gordon
by gsh
Tue Aug 21, 2018 6:12 am
Forum: Compute Module
Topic: Compute module lite not booting (LED on then off)
Replies: 32
Views: 605

Re: Compute module lite not booting (LED on then off)

https://github.com/raspberrypi/document ... /bootmodes

Use a serial cable to debug why it is not booting, if the LED is going out this means it is definitely booting bootcode.bin but not getting any further...

Gordon
by gsh
Mon Aug 20, 2018 8:01 am
Forum: Compute Module
Topic: Determining via GPIO is the OS has fully shutdown?
Replies: 2
Views: 154

Re: Determining via GPIO is the OS has fully shutdown?

gpio_restart and gpio_poweroff are built into the kernel so it should just be a matter of providing the right device tree elements with the right gpio description
by gsh
Fri Aug 17, 2018 3:34 pm
Forum: Compute Module
Topic: Re-flashing Compute Module 3
Replies: 5
Views: 282

Re: Re-flashing Compute Module 3

What about if you use the rpiboot installer on Windows 10?

https://github.com/raspberrypi/usbboot/ ... _setup.exe

Does it have the same effect?
by gsh
Fri Aug 17, 2018 8:42 am
Forum: Compute Module
Topic: Re-flashing Compute Module 3
Replies: 5
Views: 282

Re: Re-flashing Compute Module 3

What version of rpiboot are you using? Are you using a Raspberry Pi to program the compute module?

Gordon
by gsh
Sat Aug 04, 2018 8:38 am
Forum: Official Foundation Display
Topic: Official 7” Touchscreen Power
Replies: 8
Views: 345

Re: Official 7” Touchscreen Power

Dougie is I think the most active user on the forum, also one of our special 'beta' testers!

Gordon
by gsh
Mon Jul 30, 2018 10:06 am
Forum: Compute Module
Topic: Compute Module 3 Thermal Information
Replies: 4
Views: 346

Re: Compute Module 3 Thermal Information

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