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by geerlingguy
Mon Nov 29, 2021 6:16 pm
Forum: Compute Module
Topic: Compute Module 4 IO Board Fan
Replies: 38
Views: 4125

Re: Compute Module 4 IO Board Fan

ollie1973 wrote:
Mon Nov 29, 2021 5:55 pm
But I think more investigation was warranted.
When I then added the tach there's smoke coming from the EMC, so I fried it.
We thank you for your sacrifice, and for doing that investigation ;)
by geerlingguy
Mon Nov 29, 2021 5:27 pm
Forum: Compute Module
Topic: Compute Module 4 IO Board Fan
Replies: 38
Views: 4125

Re: Compute Module 4 IO Board Fan

Thought that as well, but it works fine on USB, so it IS working and has been working before all the installation/deinstallation. But I‘ll give it a try with a 12v fan and report back. Thanks! Just tried a 12v fan - same - when connecting it starts slowly spinning for a 1 sec roughly, and then turn...
by geerlingguy
Tue Nov 09, 2021 3:35 pm
Forum: General discussion
Topic: About the New Raspberry Pi 4b cpu revision
Replies: 69
Views: 3775

Re: About the New Raspberry Pi 4b cpu revision

And to add more clarity; today's blog post details how to identify a revision 1.4 Pi 4 board (apparently some even have B0 chips on them!): https://www.raspberrypi.com/news/bullseye-bonus-1-8ghz-raspberry-pi-4/ My speculation in yesterday's video that the bit that mattered was the chip stepping was ...
by geerlingguy
Mon Nov 08, 2021 12:31 pm
Forum: Raspberry Pi OS
Topic: latest debian release 11 "bullseye"
Replies: 31
Views: 17368

Re: latest debian release 11 "bullseye"

FYI to anyone following this thread, the 2021-11-08 release of Raspberry Pi OS is now based on Bullseye / Debian 11—download it here: https://www.raspberrypi.com/software/operating-systems/ Full changelog for the desktop version: https://downloads.raspberrypi.org/raspios_armhf/release_notes.txt Blog...
by geerlingguy
Fri Oct 29, 2021 7:42 pm
Forum: General discussion
Topic: The Raspberry Pi Zero 2 W Thread
Replies: 378
Views: 19206

Re: The Raspberry Pi Zero 2 W Thread

It's the same processor chip (just packaged differently) as the Pi3B/Pi3B+/Pi2Bv1.2. As such, one would expect the same OTP bits to be available and the same (optional) boot capabilities. Since the critical element is size, I am at a loss for the utility of doing so. Expect, yes. I'd like to see it...
by geerlingguy
Fri Oct 29, 2021 7:39 pm
Forum: General discussion
Topic: USB boot on the Pi Zero 2 W?
Replies: 37
Views: 2937

USB boot on the Pi Zero 2 W?

Since the Zero 2 W shares the same SoC as the Pi 3 B, which supports USB boot, I figured I'd give it a try, especially since a lot of commenters on my Pi Zero 2 review post had been asking about it. Here's what I tried: Add `program_usb_boot_mode=1` to /boot/config.txt Reboot the Pi Verify `vcgencmd...
by geerlingguy
Thu Oct 28, 2021 4:44 pm
Forum: General discussion
Topic: The Raspberry Pi Zero 2 W Thread
Replies: 378
Views: 19206

Re: The Raspberry Pi Zero 2 W Thread

My power testing is a lot different—not sure how they did their testing. I am getting 100-120 mA at idle depending on what's enabled. Then 460 mA max, with 360-400 mA tops when maxing out the CPU. I could see it hitting 500-600 mA if you're plugging in something via USB, taxing the CPU, copying ove...
by geerlingguy
Thu Oct 28, 2021 4:29 pm
Forum: General discussion
Topic: The Raspberry Pi Zero 2 W Thread
Replies: 378
Views: 19206

Re: The Raspberry Pi Zero 2 W Thread

The Toms HW review and data is worth reading to get a good insights in to the Pi02. https://www.tomshardware.com/uk/reviews/raspberry-pi-zero-2-w-review I'm a bit dubious about their power figures. My own tests show a Pi0W with an attached 3.5" LCD display idling at 185mA to 200mA, and that in...
by geerlingguy
Thu Oct 28, 2021 8:46 am
Forum: General discussion
Topic: The Raspberry Pi Zero 2 W Thread
Replies: 378
Views: 19206

Re: The Raspberry Pi Zero 2 W Thread

Does anyone know if the Zero 2 W can boot from USB? I tried the procedure for the 3 B but it didn't seem to work—I have to have a microSD card with a valid bootloader and dtb for the Zero 2 to do anything (any output, any LED activity). ro 'average user' has access to a Pi Zero 2 yet, don't they? :...
by geerlingguy
Thu Oct 28, 2021 7:48 am
Forum: General discussion
Topic: The Raspberry Pi Zero 2 W Thread
Replies: 378
Views: 19206

Re: The Raspberry Pi Zero 2 W Thread

Does anyone know if the Zero 2 W can boot from USB? I tried the procedure for the 3 B but it didn't seem to work—I have to have a microSD card with a valid bootloader and dtb for the Zero 2 to do anything (any output, any LED activity).
by geerlingguy
Thu Oct 28, 2021 7:26 am
Forum: General discussion
Topic: The Raspberry Pi Zero 2 W Thread
Replies: 378
Views: 19206

Re: The Raspberry Pi Zero 2 W Thread

I've been messing around with one, and decided I wanted to see more of the insides:

Image

More pictures in my blog post! Look inside the Raspberry Pi Zero 2 W and the RP3A0-AU
by geerlingguy
Thu Oct 21, 2021 12:48 pm
Forum: General discussion
Topic: Raspberry Pi very early boot issue
Replies: 45
Views: 3159

Re: Raspberry Pi very early boot issue

Just fixed the image link (I hope), but when I'm back at the workbench next week, I may try and see if I can get that working!
by geerlingguy
Thu Oct 21, 2021 1:18 am
Forum: General discussion
Topic: Raspberry Pi very early boot issue
Replies: 45
Views: 3159

Re: Raspberry Pi very early boot issue

i can see the 2 small resistors (R14/R16) on the right side are the voltage divider to set the voltage of the regulator the top inductor (unlabeled) is FB12 for the VLI rail the resistor with 000 is R85 feeding 1V0_SOC the bigger inductor is L5, part of the buck regulator to the side of that is C17...
by geerlingguy
Thu Oct 21, 2021 12:27 am
Forum: General discussion
Topic: Raspberry Pi very early boot issue
Replies: 45
Views: 3159

Re: Raspberry Pi very early boot issue

I don't think getting access to the EEPROM is going to do much. That power supply circuit is on the reduced schematics and it powers something to do with the SoC (ARM cores?) and also the USB 3.0 controller. Are the schematics public? With the documentation shuffle I didn't see them but I'm probabl...
by geerlingguy
Thu Oct 14, 2021 3:25 am
Forum: General discussion
Topic: Raspberry Pi very early boot issue
Replies: 45
Views: 3159

Re: Raspberry Pi very early boot issue

Just had a crazy idea, now that I have a hot air station... could I flash eeprom on another Pi 4, then replace the eeprom chip on the suffering pi 4 with it? Basically get the BOOT_UART option going that way? Might be annoying to do that though, because I don't know how much I'd trust my ability to ...
by geerlingguy
Tue Oct 12, 2021 11:32 pm
Forum: General discussion
Topic: About the New Raspberry Pi 4b cpu revision
Replies: 69
Views: 3775

Re: About the New Raspberry Pi 4b cpu revision

This would require a lot of cutting up of the board and soldering. Much easier to use a CM4 and IO board where the PCI is exposed. CM4's use the C0. mmm yes good idea also i am gonna use low end gpu like 750ti or less FYI I've been testing a number of different cards—my results are all posted on my...
by geerlingguy
Thu Oct 07, 2021 7:42 pm
Forum: General discussion
Topic: Raspberry Pi very early boot issue
Replies: 45
Views: 3159

Re: Raspberry Pi very early boot issue

Also posting two helpful/relevant links @cleverca22 sent me via IRC: A/V jack physical layout and circuit (this stuff seems intact): https://forums.raspberrypi.com/viewtopic.php?p=1746010#p1746010 X-ray view (topside/bottomside) of Pi 4 board: https://al.zerostem.io/~al/dzi/xray.html (note: this is ...
by geerlingguy
Thu Oct 07, 2021 6:19 pm
Forum: General discussion
Topic: Raspberry Pi very early boot issue
Replies: 45
Views: 3159

Re: Raspberry Pi very early boot issue

i think the next course of action, is to try and re-flash the eeprom to enable debug [clever@system76:~/apps/rpi]$ git clone https://github.com/raspberrypi/rpi-eeprom [clever@system76:~/apps/rpi]$ cd rpi-eeprom/ [clever@system76:~/apps/rpi/rpi-eeprom]$ cat bootconf.txt [all] BOOT_UART=1 WAKE_ON_GPI...
by geerlingguy
Thu Oct 07, 2021 5:27 pm
Forum: General discussion
Topic: Raspberry Pi very early boot issue
Replies: 45
Views: 3159

Re: Raspberry Pi very early boot issue

Might be morning brain fog, but the fact that the recovery.bin loads and runs means clocks and SDRAM are initialized, right? No. recovery.bin is loaded from the bootrom with sdram disabled (it is loaded into L2 cache). I believe the power supply you've hacked off goes to sdram. Without it sdram wil...
by geerlingguy
Thu Oct 07, 2021 5:02 pm
Forum: General discussion
Topic: Raspberry Pi very early boot issue
Replies: 45
Views: 3159

Re: Raspberry Pi very early boot issue

Additionally, would it be worth trying to build the rpi-open-firmware project and see what happens with it? Edit: lol, just realized cleverca22 maintains an updated fork of that project... and just now I'm making the connections between previous conversations we've had. Sometimes my brain just likes...
by geerlingguy
Thu Oct 07, 2021 4:59 pm
Forum: General discussion
Topic: Raspberry Pi very early boot issue
Replies: 45
Views: 3159

Re: Raspberry Pi very early boot issue

Just to further flesh things out and confirm it is _definitely_ somewhere in the process before loading the kernel, I also tested out Writing a "bare metal" operating system for Raspberry Pi 4 and generated the 2nd example 'writing to UART'. Looking at the Pi 4 First Stage Bootloader proce...
by geerlingguy
Wed Sep 29, 2021 2:22 pm
Forum: General discussion
Topic: Raspberry Pi very early boot issue
Replies: 45
Views: 3159

Re: Raspberry Pi very early boot issue

Indeed, it looks like help works, and I can do some other commands, e.g. ] pm_dump_all PM_USB: 0x7e10005c == 0x0000706d UP EN PM_SMPS: 0x7e10006c == 0x0000706d UP EN PM_IMAGE: 0x7e100108 == 0x00001200 EN PM_GRAFX: 0x7e10010c == 0x00001000 EN PM_PROC: 0x7e100110 == 0x00001000 EN ] pm_usb_on image dom...
by geerlingguy
Tue Sep 28, 2021 11:15 pm
Forum: General discussion
Topic: Raspberry Pi very early boot issue
Replies: 45
Views: 3159

Re: Raspberry Pi very early boot issue

recovery.zip and i fixed the issue, -fdata-sections had broken some of my linker scripts now when you run it, youll get a fully working command prompt! Thanks! I loaded it up, but ran into a dump: Uuart early init done 0.380904 [VPU:PLATFORM:platform_early_init]: PM_RSTS: 0x1000 0x0 had power on re...
by geerlingguy
Tue Sep 28, 2021 10:59 pm
Forum: General discussion
Topic: Raspberry Pi very early boot issue
Replies: 45
Views: 3159

Re: Raspberry Pi very early boot issue

Oh hey! Look at that—with your recovery.bin on the card, I am getting this (and nothing more): Uuart early init done 0.388338 [VPU:PLATFORM:platform_early_init]: PM_RSTS: 0x1000 0x0 had power on reset MEMORY: 0x4000000 + 0x1400000: VPU firmware VPU at 54mhz 0.400441 [VPU:PLATFORM:platform_early_init...
by geerlingguy
Tue Sep 28, 2021 10:47 pm
Forum: General discussion
Topic: Raspberry Pi very early boot issue
Replies: 45
Views: 3159

Re: Raspberry Pi very early boot issue

if you re-flash the SPI with BOOT_UART=1 set in the bootconf.txt, you can get debug logs on the uart, at 115200 baud I've never tried doing this — is it possible to do if the Pi's not even reading from the microSD card? I got the serial console working on an existing Pi (and I see text start coming...

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