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by gsh
Thu Jun 21, 2018 2:34 pm
Forum: Compute Module
Topic: cm3 network boot problem, rpiboot emmc overload problem
Replies: 4
Views: 86

Re: cm3 network boot problem, rpiboot emmc overload problem

Use a scope to check the signals
by gsh
Thu Jun 21, 2018 12:35 pm
Forum: Compute Module
Topic: cm3 network boot problem, rpiboot emmc overload problem
Replies: 4
Views: 86

Re: cm3 network boot problem, rpiboot emmc overload problem

By default, the CM3 has SD card boot enabled first and then falls back to USB device boot. Device boot is when the Pi appears as a USB device when plugged into a PC (i.e. it's how we program using rpiboot). And clearly, this worked for you originally. You then enabled host USB boot, this is a separa...
by gsh
Thu Jun 21, 2018 7:51 am
Forum: Compute Module
Topic: LAN9514 chip troubleshooting
Replies: 6
Views: 140

Re: LAN9514 chip troubleshooting

Where is your LAN_RUN connected? Have you got this wired as recommended by Microchip?
by gsh
Wed Jun 13, 2018 10:30 am
Forum: Compute Module
Topic: CM3 module crash after ejecting sd card
Replies: 17
Views: 587

Re: CM3 module crash after ejecting sd card

I think you've found one of the reasons that mobile phones do not have externally accessible SD card storage, if they have it it is under the battery or inserted with the SIM card...

Gordon
by gsh
Tue Jun 05, 2018 12:49 pm
Forum: Compute Module
Topic: CM3 always crashes within minutes under load
Replies: 39
Views: 3029

Re: CM3 always crashes within minutes under load

Not yet, the factory has been on stop for a week... Just awaiting test logs...

Gordon
by gsh
Tue May 29, 2018 4:49 pm
Forum: Compute Module
Topic: Dynamic profile VCore difference between RPi3 & CM3
Replies: 28
Views: 1527

Re: Dynamic profile VCore difference between RPi3 & CM3

https://drive.google.com/file/d/1blhvltF1MuXBKm3V9vt4MiPkvV3Z-PVY/view?usp=sharing The above link is a presentation showing our analysis of Pi3B and CM3 doing the same thing. The CM3 cannot dissipate as much energy into the air because of the reduced area, the addition of a heatsink doesn't make a h...
by gsh
Mon May 28, 2018 6:04 pm
Forum: Compute Module
Topic: Dynamic profile VCore difference between RPi3 & CM3
Replies: 28
Views: 1527

Re: Dynamic profile VCore difference between RPi3 & CM3

Are you saying there is no difference in the time it takes to reach 80 degrees with or without the heatsink? That sounds like poor thermal conduction, in comparison to the conduction into the PCB the thermal conduction Page 13 of this is particularly interesting: Shows only 11% of the heat escapes t...
by gsh
Fri May 25, 2018 9:34 pm
Forum: Compute Module
Topic: Installing Image on CM3 twice failing
Replies: 13
Views: 656

Re: Installing Image on CM3 twice failing

I think we're going to need to get hold of your cm3 with the broken image so we can debug it. I cannot really even begin to hazard a guess at what the problem may be at the moment...

Email me at gordon@raspberrypi.org

Gordon
by gsh
Fri May 25, 2018 2:28 pm
Forum: Compute Module
Topic: CM3 always crashes within minutes under load
Replies: 39
Views: 3029

Re: CM3 always crashes within minutes under load

Ah, right yes... No barcode!

I'll just get them to trace it through the serial number...

Gordon
by gsh
Fri May 25, 2018 1:39 pm
Forum: Compute Module
Topic: CM3 always crashes within minutes under load
Replies: 39
Views: 3029

Re: CM3 always crashes within minutes under load

Can you please take a photo of the 2D barcode on the device, it's clear that your devices are slightly slower than normal because you have some overvoltage bits set. But I just need to check what happened on the production line.

Thanks
Gordon
by gsh
Fri May 25, 2018 11:45 am
Forum: Compute Module
Topic: CM3 always crashes within minutes under load
Replies: 39
Views: 3029

Re: CM3 always crashes within minutes under load

Can you get the output from:

vcgencmd get_config int
vcgencmd get_config strings

also

vcgencmd otp_dump
by gsh
Tue May 22, 2018 5:01 pm
Forum: Compute Module
Topic: Installing Image on CM3 twice failing
Replies: 13
Views: 656

Re: Installing Image on CM3 twice failing

OK, that does sound like it is indeed failing to find the FAT partition... Can you dd the FAT partition from the non-working and working CM3 to a file? dd if=/dev/sdb of=file.img bs=512 count=522239 You can then do 'hexdump -C file.img' for both files and compare them... This may tell you what's dif...
by gsh
Tue May 22, 2018 12:48 pm
Forum: Compute Module
Topic: Installing Image on CM3 twice failing
Replies: 13
Views: 656

Re: Installing Image on CM3 twice failing

How do you know it doesn't find the bootloader on the eMMC?
by gsh
Sat May 19, 2018 5:28 pm
Forum: Compute Module
Topic: What is the difference between those two CM IO Boards?
Replies: 5
Views: 535

Re: What is the difference between those two CM IO Boards?

One is green the other is blue...
by gsh
Thu May 17, 2018 8:26 am
Forum: Compute Module
Topic: DSI Interface to Non Raspberry Pi Display
Replies: 23
Views: 12303

Re: DSI Interface to Non Raspberry Pi Display

Again, no that's wrong, the open source drivers as developed by Eric Anholt fully support the DSI display output and support full FKMS graphics output including video and 3D. What you don't have is the full datasheet for the hardware, but the source should have enough detail to replace this anyway.....
by gsh
Wed May 09, 2018 3:00 pm
Forum: Compute Module
Topic: Flashing the CM3 with Compute Module IO board
Replies: 2
Views: 239

Re: Flashing the CM3 with Compute Module IO board

Are you sure you've got the PC plugged into the USB slave connection and power connected to power in? Do both the red and green LEDs come on and stay on?

Gordon
by gsh
Wed May 09, 2018 2:29 pm
Forum: Compute Module
Topic: Can CM3 be used as CM3L by removing the EMMC
Replies: 6
Views: 352

Re: Can CM3 be used as CM3L by removing the EMMC

You would also have to add 0R links for the signals to be connected through to the edge connector, R16,17,18,19

Gordon
by gsh
Mon May 07, 2018 7:37 am
Forum: General discussion
Topic: Question about program_usb_timeout
Replies: 23
Views: 1040

Re: Question about program_usb_timeout

Actually, the problem is that it requires a full power off and back on to re-read the OTP bits... The state machine that reads the OTP bits only runs on power-on reset...
by gsh
Mon Apr 30, 2018 2:54 pm
Forum: General discussion
Topic: Question about program_usb_timeout
Replies: 23
Views: 1040

Re: Question about program_usb_timeout

Ooh... didn't realise that, will update!

Gordon
by gsh
Mon Apr 30, 2018 9:31 am
Forum: General discussion
Topic: Question about program_usb_timeout
Replies: 23
Views: 1040

Re: Question about program_usb_timeout

Just to be clear, any of the program_ options in config.txt _just_ set otp bits in the chip. These are used to change the behaviour of the bootrom. program_usb_boot_mode=1 This sets bit 29 in rows 17 and 18 of the otp which enables host boot mode (device boot mode is enabled by default anyway) progr...
by gsh
Sat Apr 28, 2018 12:49 pm
Forum: Compute Module
Topic: High bandwidth interface to FPGA?
Replies: 17
Views: 1281

Re: High bandwidth interface to FPGA?

Yes, you can use an FPGA to do CSI, with just a couple of resistors, but it won't be able to run full Gbit speed. Instead you can use a CSI phy and connect to the FPGA

Not easy though
by gsh
Sat Apr 28, 2018 12:47 pm
Forum: Compute Module
Topic: SD on CM3 wiring?
Replies: 4
Views: 356

Re: SD on CM3 wiring?

The pins you have on the diagram are for SPI... You need to find the pins for four bit sdio... The gpios can be seen in the arm peripheral datasheet as the alternate settings

Gordon
by gsh
Sat Apr 28, 2018 12:45 pm
Forum: Compute Module
Topic: CM3 Flashing on Windows 7 broken?
Replies: 9
Views: 2655

Re: CM3 Flashing on Windows 7 broken?

Don't understand your system...

Can you describe what is going wrong?
by gsh
Fri Apr 27, 2018 10:40 am
Forum: Compute Module
Topic: Dynamic profile VCore difference between RPi3 & CM3
Replies: 28
Views: 1527

Re: Dynamic profile VCore difference between RPi3 & CM3

Also, Fast chips don't need as much voltage to run at the same speed and therefore use less power, but fast chips have greater static power consumption Slow chips need more voltage but have less static power consumption... The main difference between Pi3 and CM3 is the energy dissipation either thro...
by gsh
Thu Apr 05, 2018 9:42 am
Forum: Compute Module
Topic: scriptexecutor problem
Replies: 2
Views: 229

Re: scriptexecutor problem

Yeah, I'm just looking into some CM3 booting problems now...

Might be worth reverting the firmware back to when maxnet originally wrote the scriptexecutor to see if that helps?

Gordon

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