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by alexdev
Mon Jun 24, 2019 4:07 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 951
Views: 113668

Re: Raspberry Pi 4 Thread - general discussion

I can see in the bcm2838.dts a reference to another xHCI-compilant controller which is disabled. xhci: xhci@7e9c0000 { compatible = "generic-xhci"; status = "disabled"; reg = <0x0 0x7e9c0000 0x100000>; interrupts = <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>; }; What's the purpose of this? Also, where are the...
by alexdev
Mon Jun 24, 2019 1:54 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 951
Views: 113668

Re: Raspberry Pi 4 Thread - general discussion

Windows 10 Desktop Editions only run on x86 CPU Architecture, you may be able to use a virtual machine ?? https://github.com/WOA-Project/WOA-Deployer-Rpi That is Windows on ARM version, which is significantly different to Windows on x86, also it is not a MS official release... It's not significantl...
by alexdev
Mon Jun 24, 2019 10:47 am
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 951
Views: 113668

Re: Raspberry Pi 4 Thread - general discussion

I saw on a previous comment that VC4 is still there. Is this true? And what's the purpose of it if VC6 is already on-die?

Also, a few other questions:
1. Is the audio jack still PWM-driven?
2. The Arasan SD controller has also been replaced or just the Broadcom SDHost one?
by alexdev
Mon Jun 24, 2019 10:31 am
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 951
Views: 113668

Re: Raspberry Pi 4 Thread - general discussion

What PCIe controller does the new SoC use?
by alexdev
Tue Jan 16, 2018 4:12 pm
Forum: General discussion
Topic: Pi3 incorrect results under load (possibly heat related)
Replies: 105
Views: 55276

Re: Pi3 incorrect results under load (possibly heat related)

I have a small 5v FAN attached to the 5V rail of my Pi, and I observed that while running the cpuburn-a53 stress test the FAN speed decreased and after stopping the stress test the FAN speed reached again full speed. It seems a bad sign that 5V power drops enough for the speed of the fan to change....
by alexdev
Sun Jan 14, 2018 1:38 pm
Forum: General discussion
Topic: Pi3 incorrect results under load (possibly heat related)
Replies: 105
Views: 55276

Re: Pi3 incorrect results under load (possibly heat related)

After increasing over_voltage to 2 my Pi3 reached 6.5 GFlops with stock frequency and N = 8000. With N = 10000 I get 6.770 GFlops. That's a bit strange. At the beginning I got around 5.3 GFlops, but after repeating the benchmark several times the perfomance improved. Overclocking the Pi at 1300 GHz ...
by alexdev
Sun Jan 14, 2018 1:15 pm
Forum: Troubleshooting
Topic: HPL test failing on RPi3
Replies: 1
Views: 374

Re: HPL test failing on RPi3

I have tried setting over_voltage=2 in config.txt and now it passes everytime using N=8000 and stock frequency.

At the beginning it started with 5.2 GFlops and after repeating the test several times it reached 6.5 GFlops.
by alexdev
Sun Jan 14, 2018 10:07 am
Forum: General discussion
Topic: New Open GL Driver, Bug report thread
Replies: 98
Views: 48378

Re: New Open GL Driver, Bug report thread

On my Raspberry Pi 3 it works fine, except the fact that I get some white dots in the left side of the screen if the background is black. e.g: terminal window on the left side of the screen . Is this a common problem? On other CRT TV with Composite i get the same white dots, so it's not because of t...
by alexdev
Sat Jan 13, 2018 8:25 pm
Forum: Troubleshooting
Topic: HPL test failing on RPi3
Replies: 1
Views: 374

HPL test failing on RPi3

Hi! I'm trying to benchmark my RPi3 but i have a problem: the HPL test fails everytime i run it, and sometimes the Pi freezes and SSH is unresponsive, so I have to hard reboot it. I tried lowering the N number to 4000 and it fails again. But, after I underclocked my pi to 1100 MHz the test PASSED su...
by alexdev
Thu Jan 11, 2018 6:46 pm
Forum: Troubleshooting
Topic: Raspberry Pi 3 freezes
Replies: 1
Views: 292

Raspberry Pi 3 freezes

Hi! My Pi3 freezes if I open Chromium and do other work in background (downloading packages using terminal and running different commands) (but not everytime!) and the ACT led stays on forever. The cursor moves just a bit after A LONG period of time, i can't enter in any rescue terminal using FN key...
by alexdev
Sun Dec 31, 2017 8:07 am
Forum: General discussion
Topic: Is it safe?
Replies: 14
Views: 2110

Re: Is it safe?

You're right. I used another power supply and the FAN did the same thing.
by alexdev
Sat Dec 30, 2017 4:52 pm
Forum: General discussion
Topic: Is it safe?
Replies: 14
Views: 2110

Re: Is it safe?

I unplugged the power supply from the wall outlet and after 2 hours I plugged it back, I removed the SD card from the Pi and plugged the micro usb connector. The FAN started at low speed and after a few seconds it reached full speed. If I unplug the micro usb connector and plug it back in the FAN st...
by alexdev
Sat Dec 30, 2017 12:07 pm
Forum: General discussion
Topic: Is it safe?
Replies: 14
Views: 2110

Re: Is it safe?

The power supply cord cannot be detached. I powered off the Pi and disconnected the power cord for a few seconds, and after I plugged it back in the FAN started at full speed. Maybe the PSU needs a time to "warm" ? The fan starts slow during boot process only if i don't power the Pi (and use the pow...
by alexdev
Sat Dec 30, 2017 11:55 am
Forum: General discussion
Topic: Is it safe?
Replies: 14
Views: 2110

Re: Is it safe?

I have the RPi 3 original power supply that delivers 5.1V / 2,5A .

There is no lightning bolt on the screen and the red LED stays on. If I shut down the Pi the red light still remains on and the fan is still running at full speed until I disconnect the power cord.
by alexdev
Sat Dec 30, 2017 11:36 am
Forum: General discussion
Topic: Is it safe?
Replies: 14
Views: 2110

Re: Is it safe?

Now after the "tape mod" the connector can't touch other pins.

Isn't 0,2A too much current ?
by alexdev
Sat Dec 30, 2017 11:22 am
Forum: General discussion
Topic: Is it safe?
Replies: 14
Views: 2110

Re: Is it safe?

So, everything should be fine? I have the fan connected on 5V and GND pins. No, the problem is not the fact that the GPIO pins are exposed. The problem is that the FAN connector have the 2 contacts (5V, GND) exposed to the side of the other GPIO pins and they touch each other if I don't put some tap...
by alexdev
Sat Dec 30, 2017 10:51 am
Forum: General discussion
Topic: Is it safe?
Replies: 14
Views: 2110

Is it safe?

Hi! Recently I bought a Raspberry Pi 3 model B and an acrylic case with fan for it. The first problem I encountered was the fact that the connector exposed the contacts and it could probably touch the other GPIO pins and make a short-circuit. I've fixed this problem by bending the opposite pins a bi...

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