forum.pistar.uk

Here is the situation. I have a total of four Chinese Jumbo spots that have been working flawlessly with RPI Zero W and full size RPI 3B+. I needed to build a few more so I purchased some RPI 4's. None of the Chinese Jumbo spots work in any of the RPI 4's. When the card is inserted, and powered, only the green led on the card comes on, no other lights come on and of course the unit does not work as a hot spot.

I purchased the "official" RPI 4 PSU, still nothing.

I tried with and without the SD card inserted, same behavior.

So I know the Jumbo spots work, I know the RPI 4's work, but they don't seem to work together.

These are the cards I am using:

https://www.ebay.com/itm/112741405082

For the record, using the following image: Pi-Star_RPi_V4.1.5_21-Jun-2021.zip

Please run this command and let me have the last few lines of the output;

processor : 0
model name : ARMv7 Processor rev 3 (v7l)
BogoMIPS : 108.00
Features : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd3
2 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part : 0xd08
CPU revision : 3

processor : 1
model name : ARMv7 Processor rev 3 (v7l)
BogoMIPS : 108.00
Features : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd3
2 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part : 0xd08
CPU revision : 3

processor : 2
model name : ARMv7 Processor rev 3 (v7l)
BogoMIPS : 108.00
Features : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd3
2 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part : 0xd08
CPU revision : 3

processor : 3
model name : ARMv7 Processor rev 3 (v7l)
BogoMIPS : 108.00
Features : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd3
2 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part : 0xd08
CPU revision : 3

Hardware : BCM2711
Revision : b03114
Serial : 1000000021d945c4
Model : Raspberry Pi 4 Model B Rev 1.4

Attaching a pic of hat running.

Not so simple. This happens even without any SD card inserted.

The other lights do not come on under any circumstances even after you select the modem.

Works perfectly in RPI ZERO AND 3b+.

Good question. Pressing the reset does activate all the light but rebooting brings it back to non working state. Crazy!

Yes, 100%. I have built a dozen of these but never with the RPI4.

Resetting Modem: STM32-DVM / MMDVM_HS - Raspberry Pi Hat (GPIO)
Warning: Stopping mmdvmhost.service, but it can still be activated by:
mmdvmhost.timer
Compatible modem not configured.

I am 100% convinced this is a hardware compatibility issue between the pi4 and these particular mmdvm hats all of which are from the same ebay seller.

Same hat on the pi3 or pi-zero does the three blinks after applying power and works perfectly thereafter. This is even with no SD card installed. So this completely rules out any possible software issues.

I've always found that modem selection causes problems, I suggest you change it to what Jason mentioned up thread and try again.