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by dividuum
Sun Oct 31, 2021 10:11 am
Forum: Raspberry Pi OS
Topic: Known-good Stretch image won't boot on Zero 2 - PARTIAL SOLUTION
Replies: 5
Views: 408

Re: Known-good Stretch image won't boot on Zero 2 - PARTIAL SOLUTION

In addition the the latest Pi firmware, you likely need the latest firmware files for the WiFi module. You find them at https://github.com/RPi-Distro/firmware- ... aster/brcm. The need to be in /lib/firmware/brcm.
by dividuum
Tue Jun 08, 2021 2:31 pm
Forum: General discussion
Topic: Trying to play a 3840x1080 video across screens on a RPI4. This device is garbage, or am I stupid?
Replies: 45
Views: 2514

Re: Trying to play a 3840x1080 video across screens on a RPI4. This device is garbage, or am I stupid?

Rendering will want to be via DRM/KMS, but even that is non-trivial as you have a pair of outputs that are not frame synchronised As I've been summoned to this thread, I might as well use the opportunity: Is there ever going to be a way to influence the HDMI clock in a way to force the two outputs ...
by dividuum
Sat Jun 05, 2021 9:57 am
Forum: OpenMAX
Topic: Overlaying an image using OMXPlayer and numpy array
Replies: 2
Views: 1226

Re: Overlaying an image using OMXPlayer and numpy array

Two immediate hints I can give: While both programs are running, run „vcgencmd dispmanx_list“ in a third terminal. It will show active layers and you should see both layers if you configured everything correctly. If you only see one layer, maybe omxplayer is configured to exclusively use the output....
by dividuum
Fri Dec 04, 2020 3:20 pm
Forum: Compute Module
Topic: CM4: CHange bootloader config
Replies: 21
Views: 4479

Re: CM4: CHange bootloader config

[...] It is related to the self update feature and I'm not sure if that is actually required or not. If it isn't required then you just put the SHA256 hash of the bootcode bin into the .sig file.[...] Seems like it is required for self-update now: Have a look at this discussion about the new timest...
by dividuum
Mon Oct 19, 2020 10:35 pm
Forum: Compute Module
Topic: Compute module 4 questions
Replies: 74
Views: 4200

Re: Compute module 4 questions

https://turingpi.com/ had an announcement today.
by dividuum
Mon Oct 05, 2020 5:56 pm
Forum: Advanced users
Topic: Fast booting rasbian lite
Replies: 8
Views: 444

Re: Fast booting rasbian lite

jay_eye wrote:
Mon Oct 05, 2020 5:33 pm
Interesting. So a 1 gb rp4 may be faster than a 4gb?
I would guess so. The 8GB Pi I have takes a long time (15 seconds or so?) before the first kernel output shows up.
by dividuum
Mon Oct 05, 2020 4:58 pm
Forum: Advanced users
Topic: Fast booting rasbian lite
Replies: 8
Views: 444

Re: Fast booting rasbian lite

There seems to be happening something slow before the kernel starts but I dont get what? Before the kernel has a chance to boot, the EEPROM is in control and is initializing the SDRAM (iirc). I'm not sure there is a way to reduce that other than using a Pi 4 variant with less memory. You should als...
by dividuum
Thu Jun 18, 2020 3:06 pm
Forum: General discussion
Topic: Best RPI software that isn't in the Repos?
Replies: 30
Views: 4858

Re: Best RPI software that isn't in the Repos?

...so not installation is required. All dependencies can be install with apt. That is a contradiction in terms. Agreed. What I meant with the first part is: You can place the single binary anywhere you want. It doesn't require a specific location within the file system and does not require other fi...
by dividuum
Thu Jun 18, 2020 2:47 pm
Forum: General discussion
Topic: Best RPI software that isn't in the Repos?
Replies: 30
Views: 4858

Re: Best RPI software that isn't in the Repos?

Once in a while, I find a cool application that is not in Raspbian's repositories, but compiles and runs well on the Pi. Now I'd like to start a collection of these, since it seems like a lot of new beginners would be interested in these too. I built info-beamer pi . It's a tool to create visual co...
by dividuum
Wed May 13, 2020 4:22 pm
Forum: OpenGLES
Topic: Tearing in kmscube on Pi4
Replies: 14
Views: 4628

Re: Tearing in kmscube on Pi4

6by9 wrote:
Wed May 13, 2020 4:06 pm
vc4-kms-v3d
In contrast to the fake-kms I guess? Is that not going to get any attention going forward?
by dividuum
Wed May 13, 2020 3:51 pm
Forum: OpenGLES
Topic: Tearing in kmscube on Pi4
Replies: 14
Views: 4628

Re: Tearing in kmscube on Pi4

Any update on this issue? I didn't notice any commit comment that looked related, but I might have missed them.
by dividuum
Sun May 03, 2020 7:59 pm
Forum: Advanced users
Topic: Pi 4B “Factory Reset” Strategy Ideas
Replies: 10
Views: 1358

Re: Pi 4B “Factory Reset” Strategy Ideas

Some backstory, I’m using a Pi in a device that closes off access to the Pi itself. In case something goes wrong and I want to “reset” the SD card image, I can’t remove the card to re-image it. My OS has a similar optional feature: Holding a configurable GPIO button results in the data partition be...
by dividuum
Thu Apr 30, 2020 8:20 pm
Forum: Troubleshooting
Topic: [PATCHED ?]Initramfs can't always mount boot partition
Replies: 5
Views: 672

Re: Initramfs can't always mount boot partition

Would it be then that if I do a three try approach to mount this might solve the issue? I guess that would work if that's indeed the issue here. My memory is a bit fuzzy as that has been year ago and I didn't touch that part since then, so it might also be someting completely different root cause.
by dividuum
Thu Apr 30, 2020 7:51 pm
Forum: Troubleshooting
Topic: [PATCHED ?]Initramfs can't always mount boot partition
Replies: 5
Views: 672

Re: Initramfs can't always mount boot partition

Seeing as this is a random issue what debug information should be recorded that would be useful? The initramfs is able to detect and recover from this issue and the system boots normally with just an error message. I've observed that it sometimes takes a short moment before /dev/mmcblk0p1 is availa...
by dividuum
Mon Apr 20, 2020 5:51 pm
Forum: Advanced users
Topic: Raspberry Pi4 bootloader beta update and new stable release stream
Replies: 56
Views: 12377

Re: Raspberry Pi4 bootloader beta update and new stable release stream

M1dn1ghtN1nj4 wrote:
Mon Apr 20, 2020 5:49 pm
Maybe a dumb question, but when flashing the bootloader, is it persistent? I can swap sd cards, reinstall Raspian/OctoPrint etc, and the bootloader will stay updated? Updated on an eeprom similar to a BIOS?
Exactly.
by dividuum
Mon Apr 20, 2020 4:16 pm
Forum: Advanced users
Topic: Raspberry Pi4 bootloader beta update and new stable release stream
Replies: 56
Views: 12377

Re: Raspberry Pi4 bootloader beta update and new stable release stream

Thanks timg236 for confirming and giving some extra details.
by dividuum
Mon Apr 20, 2020 3:15 pm
Forum: Advanced users
Topic: Raspberry Pi4 bootloader beta update and new stable release stream
Replies: 56
Views: 12377

Re: Raspberry Pi4 bootloader beta update and new stable release stream

[...] the recovery.bin approach is safe in the event of power failure. I've read that in the documentation (section SELF_UPDATE) already. I guess the reason is that if the EEPROM update is done by recovery.bin, one of two outcomes can happen: Pi finds and loads recovery.bin, which then flashes piee...
by dividuum
Sun Apr 19, 2020 10:53 am
Forum: Beginners
Topic: How do I tell how much memory my Pi has?
Replies: 14
Views: 976

Re: How do I tell how much memory my Pi has?

Yet another new feature/change that seems to have only be publicised by accident :-( PeterO Agreed. It would be great to have some centralized feed of those awesome improvements that constantly pop up in firmware/eeprom/Linux commits as well as the forum. The rest of the eeprom improvements made al...
by dividuum
Sun Apr 19, 2020 9:25 am
Forum: Beginners
Topic: How do I tell how much memory my Pi has?
Replies: 14
Views: 976

Re: How do I tell how much memory my Pi has?

Diagnostics screen should tell you.
Wow. Totally missed that. Here's how it looks like in case anyone hasn't seen it before:

Image

(I tried documenting the values here)
by dividuum
Tue Apr 07, 2020 4:03 pm
Forum: General programming discussion
Topic: Creating Server For Multi-Location Video Loopers
Replies: 6
Views: 792

Re: Creating Server For Multi-Location Video Loopers

I would like to create some type of server that I can access all the video loopers attached to the back of our TVs in each of our locations. I would like to be able to change out videos from this server and manage the videos from one location. Has anyone done something like this and might be able t...
by dividuum
Thu Mar 26, 2020 4:45 pm
Forum: Graphics, sound and multimedia
Topic: Span images/videos across two monitors 3840x1080
Replies: 27
Views: 4397

Re: Span images/videos across two monitors 3840x1080

@dividuum, did you manage to get HEVC into GL textures? So far I didn't. I tried it, but I wasn't successful thus far. Honestly, I'm not sure what the problem was. I figured that the result wouldn't be too useful anyway in my case: The higher resolution, which is one of the reason to use HEVC, woul...
by dividuum
Wed Mar 25, 2020 8:05 pm
Forum: OpenMAX
Topic: Capturing screen on RPi3 without glReadPixels
Replies: 4
Views: 3277

Re: Capturing screen on RPi3 without glReadPixels

Currently I did it using MMAL, the screen data is obtained using the glReadPixels. It is highly inefficient, so here is the question - are there any way to feed screen content to MMAL directly without using glReadPixels? Some ideas, but I guess all are still too slow for any usable frame rate: You ...
by dividuum
Thu Mar 19, 2020 9:47 pm
Forum: Troubleshooting
Topic: wrong OTP for pi4?
Replies: 6
Views: 748

Re: wrong OTP for pi4?

I looked deeper and have found difference between these Pi`s - otp boot parameter is different: I'm not sure if the OTP settings have any effect on the boot process. The Pi4 uses the eeprom for those settings. Have a look at the output of: vcgencmd bootloader_config See also https://www.raspberrypi...
by dividuum
Fri Mar 13, 2020 10:04 pm
Forum: OpenGLES
Topic: X-Less OpenGL on RPi 4?
Replies: 3
Views: 1641

Re: X-Less OpenGL on RPi 4?

The previous closed source driver from the Pi3 and before is no longer usable on the Pi4. OpenGL is now based on Mesa3D and DRM. Both keywords should result in previous discussion about this. Getting a GL context is unfortunately a lot more complex than before. A somewhat complete demo of how GL is ...

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