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by zervanko
Wed Dec 19, 2018 6:22 pm
Forum: Troubleshooting
Topic: Why I can't use 2 usb hdd simultaniously?
Replies: 1
Views: 120

Why I can't use 2 usb hdd simultaniously?

I have Raspberrry Pi 3B (OLD version, not 3B+) powered by official power adapter (2.5 A) If I connect one usb hdd, it's ok, but if I connect second one all of them start unmounting and appear with new device names, for example sda and sdb become sdb and sdc. I think it is pecause Raspberr Pi doesn't...
by zervanko
Sun Sep 30, 2018 7:43 am
Forum: Troubleshooting
Topic: STICKY: Setting up HDMI output when video output is wrong.
Replies: 543
Views: 946115

Why option avoid_edid_fuzzy_match=1 not working?

I set avoid_edid_fuzzy_match=1 to /boot/config.txt But my Raspberry still select lower resolution, because it has 162mhz (due to edidparser output)
by zervanko
Sat Sep 29, 2018 3:31 pm
Forum: Troubleshooting
Topic: What means "score" in edidparser tool?
Replies: 0
Views: 162

What means "score" in edidparser tool?

Hello. I have a problem - if I connect my Raspberry Pi by HDMI-DVI adapter to my full hd monitor, then my Raspberry select 1600x1200 resolution instead of 1920x1080. I made edid.dat file by tvservice -d edid.dat, then opened it by edidparser edid.dat. I can see, that raspberry recognizes full hd res...
by zervanko
Mon Jul 16, 2018 7:41 am
Forum: Troubleshooting
Topic: Does Raspberry Pi 3B(not +) support Wi-Fi channel 8-13?
Replies: 2
Views: 269

Does Raspberry Pi 3B(not +) support Wi-Fi channel 8-13?

I see in this (https://medium.com/@ghalfacree/benchmar ... 122cf3d806 ; see Wi-Fi Benchmark) 3B+ review that:
Cells 9 through 13 inclusive are only visible on the Pi 3 B+
But why? I can see all these channels on my 3B.
by zervanko
Wed Jul 04, 2018 6:52 am
Forum: Advanced users
Topic: What is the true specifications of Raspberry Pi 3 Model B's GPU?
Replies: 7
Views: 9297

Re: What is the true specifications of Raspberry Pi 3 Model B's GPU?

The VideoCore blocks inside the different versions of Pi are all identical. Only the ARM cores change. H263, MPEG4, and H264 decode is supported on all Pis. MPEG2 and VC-1 decode are supported on all Pis if you buy the licence for them. H264 encode is supported on all Pis. You guys, don't think, th...
by zervanko
Mon Jul 02, 2018 2:37 pm
Forum: Advanced users
Topic: What is the true specifications of Raspberry Pi 3 Model B's GPU?
Replies: 7
Views: 9297

Re: What is the true specifications of Raspberry Pi 3 Model B's GPU?

Please note that those are all third party sites, so there is no way to influence them. People like to write about stuff, and they aren't always accurate. The official spec sheet is at https://static.raspberrypi.org/files/product-briefs/Raspberry-Pi-Model-Bplus-Product-Brief.pdf H.264, MPEG-4 decod...
by zervanko
Mon Jul 02, 2018 12:56 pm
Forum: Advanced users
Topic: What is the true specifications of Raspberry Pi 3 Model B's GPU?
Replies: 7
Views: 9297

What is the true specifications of Raspberry Pi 3 Model B's GPU?

I've found three versions of Raspberry Pi 3 Model B's GPU specifications: 1) https://elinux.org/RPi_Hardware , https://bits4device.wordpress.com/2017/04/24/all-about-raspberry-pi , etc: Broadcom VideoCore IV, OpenGL ES 2.0,OpenVG 1080p60 H.264 high-profile encode/decode, 400 MHz 2) https://docs-emea...
by zervanko
Sun Jul 01, 2018 4:18 pm
Forum: Advanced users
Topic: Is Raspberry Pi affected by "rowhammer" vulnerability?
Replies: 5
Views: 632

Re: Is Raspberry Pi affected by "rowhammer" vulnerability?

It uses LPDDR2, which is not the same as DDR2 "Row hammer rarely or never affects DDR and DDR2 SDRAM modules." from Wikipedia article. The biggest difference is LPDDR2 is "low power" consumption. So it's highly unlikely that row hammer affects it. Cheers. But here you can see, that RAMPage works on...
by zervanko
Sun Jul 01, 2018 3:59 pm
Forum: Advanced users
Topic: Is Raspberry Pi affected by "rowhammer" vulnerability?
Replies: 5
Views: 632

Re: Is Raspberry Pi affected by "rowhammer" vulnerability?

wildfire wrote:
Sun Jul 01, 2018 3:46 pm
The Pi uses DDR2 RAM, so no rowhammer is not an issue.
It uses LPDDR2, which is not the same as DDR2
by zervanko
Sun Jul 01, 2018 3:01 pm
Forum: Advanced users
Topic: Is Raspberry Pi affected by "rowhammer" vulnerability?
Replies: 5
Views: 632

Is Raspberry Pi affected by "rowhammer" vulnerability?

Due to news about RAMPage (Android vulnerability), I found out about the thing, that called "rowhammer". So is Raspberry Pi vulnerable to rowhammer attack. Actually, I care about Raspberry Pi 3.
by zervanko
Sun Jun 24, 2018 2:58 pm
Forum: Troubleshooting
Topic: Why Raspberry Pi is affected by USB KIller?
Replies: 26
Views: 1711

Re: Why Raspberry Pi is affected by USB KIller?

Heater wrote:
Sun Jun 24, 2018 2:54 pm
Perhaps the USB killer goes up to 15001 volts :)
[MOD EDIT - LINK REMOVED] , see here:
Output voltage: -215 VDC
by zervanko
Sun Jun 24, 2018 2:45 pm
Forum: Troubleshooting
Topic: Why Raspberry Pi is affected by USB KIller?
Replies: 26
Views: 1711

Why Raspberry Pi is affected by USB KIller?

https://www.youtube.com/watch?v=gLKF75uCVZM - the Raspberry Pi 2 (LAN9514) can be broken by USB Killer. But as I see here https://www.microchip.com/wwwproducts/en/LAN9514 it has "Built-in ±8kV/15kV contact/air discharge ESD protection on both USB and Ethernet PHYs", so why USB Killer can desroy the ...
by zervanko
Sun Jun 24, 2018 6:24 am
Forum: Advanced users
Topic: Is there any "speed control" for USB and Ethernet on Rasprberry Pi 3?
Replies: 0
Views: 201

Is there any "speed control" for USB and Ethernet on Rasprberry Pi 3?

I'll try to explain, what I am talking about. For exaple, I will connect to my Raspberry Pi 3: External HDD Wi-Fi dongle Ethernet First of all, I will start downloading some files on my HDD from internet site, but as LAN9514 actually is a hub, the speed is limited by USB 2.0. So, how speed will be s...
by zervanko
Sat Jun 23, 2018 6:44 pm
Forum: Advanced users
Topic: Can we use internal FM radio in Raspberry Pi 3?
Replies: 1
Views: 349

Can we use internal FM radio in Raspberry Pi 3?

As we know, the Raspberry Pi 3 has http://www.cypress.com/documentation/da ... -bluetooth to provide Bluetooth and Wi-Fi. But I also see on Cypress's site, that this chip has FM Receiver, so can we use it?

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