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by lb
Mon Mar 06, 2017 10:37 pm
Forum: General discussion
Topic: WiFi channel 13 issues on Zero W
Replies: 6
Views: 2014

Re: WiFi channel 13 issues on Zero W

Of course, like I said, the regulatory region is configured correctly. And if it weren't, even scans for networks on channel 13 wouldn't turn up anything.
by lb
Mon Mar 06, 2017 9:55 pm
Forum: General discussion
Topic: WiFi channel 13 issues on Zero W
Replies: 6
Views: 2014

WiFi channel 13 issues on Zero W

When the Raspberry Pi 3 came out, it had some issues with WiFi channel 13. Now it looks like this is repeating with the Zero W for some reason. I'm seeing some really weird things here with both the 4.4.x and the 4.9.x firmware/kernel branches: The Zero W won't connect to any WiFi running on channel...
by lb
Thu Oct 13, 2016 6:06 am
Forum: Raspbian
Topic: Flash Player now available for Chromium
Replies: 98
Views: 39471

Re: Flash Player now available for Chromium

Maybe a white list can be shipped that only enables Flash for specific sites by default? As far as I can see, it was only included because of Scratch 2, after all.

I'd also prefer to have Flash available in a separate package.
by lb
Tue Apr 26, 2016 11:24 pm
Forum: General discussion
Topic: PCB Standoffs - 16mm versions in the UK?
Replies: 8
Views: 1353

Re: PCB Standoffs - 16mm versions in the UK?

Buy from an actual electronics distributor, e.g. Mouser or DigiKey. In most cases you can get free shipping if you order enough. They do all the customs stuff for you as well. These distributors aren't always cheap, but on the other hand you can get pretty much anything imaginable and you can expect...
by lb
Wed Apr 13, 2016 8:57 pm
Forum: Advanced users
Topic: Linux kernel is now 4.4
Replies: 114
Views: 61565

Re: Linux kernel is now 4.4

Because in the kernel 4.4, those modules (ipv6, sit) are built-in: That wasn't intentional. I've pushed an update where IPV6 is a module again. @MrEngman does that make a difference to the behaviour you see? And I thought you'd finally do the sane thing and bake IPv6 support directly into the kerne...
by lb
Tue Mar 15, 2016 11:03 pm
Forum: General discussion
Topic: The Raspberry Pi 3 Model B Q&A thread
Replies: 456
Views: 173091

Re: The Raspberry Pi 3 Model B Q&A thread

The bigger white part is probably a balun or something like that for impedance matching the antenna.
by lb
Tue Mar 15, 2016 10:48 pm
Forum: General discussion
Topic: Pi3 incorrect results under load (possibly heat related)
Replies: 105
Views: 43413

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

Note that I also see random internal compiler errors from time to time when compiling software. That's not a synthetic benchmark or anything like that. In fact, these random compiler errors brought me here to investigate further. For the record, I used clang 3.7.1 to compile OpenCV 3.1. So nothing s...
by lb
Tue Mar 15, 2016 9:42 pm
Forum: General discussion
Topic: Pi3 incorrect results under load (possibly heat related)
Replies: 105
Views: 43413

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

how much longer did you have it running ? i'm running it for about an hour now with over_voltage=2, all tests done passed so far. Not particularly long - around 30 minutes. @dom ARM core frequency reduction definitely helps, both boards are stable at 1100 MHz. It doesn't really look like temperatur...
by lb
Tue Mar 15, 2016 9:10 pm
Forum: General discussion
Topic: Pi3 incorrect results under load (possibly heat related)
Replies: 105
Views: 43413

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

Earlier I reported that one of my boards was able to run the benchmark with over_voltage=2. I've now done a longer test and sadly it still fails sometimes (9 out of 10 runs are fine) with incorrect results. The other board even fails with over_voltage=4. And raising the voltage like mad cannot be a ...
by lb
Tue Mar 15, 2016 3:48 pm
Forum: General discussion
Topic: Pi3 incorrect results under load (possibly heat related)
Replies: 105
Views: 43413

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

I think I can rule out power issues in my case. With my 2000 mA rated RS Components PSU, surely enough the voltage drops from 5.13V at idle down to 4.83V under heavy load with xhpl. However, there are no dropouts below that and there's little line noise. I hooked up a scope to check this. So everyth...
by lb
Mon Mar 14, 2016 10:41 pm
Forum: General discussion
Topic: Pi3 incorrect results under load (possibly heat related)
Replies: 105
Views: 43413

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

I just did some more testing with the second Pi 3 board I mentioned - some overvolting (over_voltage=2) fixes stability and correctness on that one. Of course that's still not a solution, though. On the first Pi 3 board, no overvolting is able to fix things, only downclocking to at least 1100 MHz ma...
by lb
Mon Mar 14, 2016 1:46 pm
Forum: General discussion
Topic: pi 3 wifi range
Replies: 33
Views: 49851

Re: pi 3 wifi range

WIth the power management issues sorted out, the range seems to be comparable to the "nano" USB dongles and similar, maybe even a bit better.
by lb
Mon Mar 14, 2016 12:50 pm
Forum: General discussion
Topic: Pi3 incorrect results under load (possibly heat related)
Replies: 105
Views: 43413

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

The Linpack benchmark also fails for me on both of my Pi 3 boards. On one board, I either get hard system crashes or incorrect results, even with over_voltage=2. On the other, I see system crashes or "illegal instruction" aborts. Haven't tested over_voltage yet. In both cases, this was with passive ...
by lb
Sun Mar 13, 2016 9:50 am
Forum: General discussion
Topic: Pi3 incorrect results under load (possibly heat related)
Replies: 105
Views: 43413

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

I have seen non-deterministic compiler crashes (and system crashes, too) while compiling big packages like OpenCV on one of my Pi 3. This is with passive heatsink and open case. I also did some experiments with active cooling which kept the temperature below 60 degC according to sensor, but it did n...
by lb
Thu Mar 10, 2016 9:50 am
Forum: Advanced users
Topic: Raspberry Pi 3 - Bluetooth PL011 UART (9bit on mini-UART)?
Replies: 22
Views: 13093

Re: Raspberry Pi 3 - Bluetooth PL011 UART (9bit on mini-UART

@twelvearrays

Lock the core clock by adding core_freq=250 to config.txt. Also try launching hciattach manually, what does it say?
by lb
Wed Mar 09, 2016 11:15 pm
Forum: Advanced users
Topic: Get the UART PL011 without PULL-UP on TX
Replies: 1
Views: 439

Re: Get the UART PL011 without PULL-UP on TX

The interal pull-up is quite weak. If you want to add a (stronger) external pull-up, you can probably ignore the internal one. It doesn't matter.
by lb
Tue Mar 08, 2016 8:17 am
Forum: Advanced users
Topic: Raspberry Pi 3 - Bluetooth PL011 UART (9bit on mini-UART)?
Replies: 22
Views: 13093

Re: Raspberry Pi 3 - Bluetooth PL011 UART (9bit on mini-UART

FWIW, with the new pi3-miniuart-bt overlay, Bluetooth works fine and stable with the Mini UART. I was able to scan, pair, send files over OBEX, and so on. Of course, it is 8x slower than the PL011 UART at 115200 baud. Keep in mind to adjust the "console" value in cmdline.txt and to lock the core clo...
by lb
Fri Mar 04, 2016 12:22 pm
Forum: Advanced users
Topic: Analogue audio testing
Replies: 265
Views: 109712

Re: Analogue audio testing

This is a very cool effort! Are there any ideas to get around the issues with PWM buffer underrun? Doesn't the VC4 have some internal memories that can be used, or maybe the builtin cache can help?
by lb
Fri Mar 04, 2016 11:56 am
Forum: Troubleshooting
Topic: My RPi 3 Gives wrong Info or Not?
Replies: 9
Views: 12098

Re: My RPi 3 Gives wrong Info or Not?

It is perfectly normal that ARMv7 is reported. The CPU is capable of ARMv8, but Raspbian and all other distributions still use a 32 bit ARM kernel and userland. The CPU boots up in 32 bit compatibility mode.
by lb
Thu Mar 03, 2016 2:33 pm
Forum: Advanced users
Topic: Raspberry Pi 3 - Bluetooth PL011 UART (9bit on mini-UART)?
Replies: 22
Views: 13093

Re: Raspberry Pi 3 - Bluetooth PL011 UART (9bit on mini-UART

The Mini UART has less buffering, so you may want to use a lower baud rate. That's not a big deal for most use cases, I guess. What's more problematic is that the Mini UART uses the core clock, which can vary, particularly in case of thermal events or when there's too little power. However, this app...
by lb
Wed Mar 02, 2016 7:46 pm
Forum: Troubleshooting
Topic: RPi 3 - Very poor wifi performance
Replies: 77
Views: 101804

Re: RPi 3 - Very poor wifi performance

FYI, checking out the 'next' branch of firmware/kernel apparently fixed channels 12/13 for me. I'm posting this from a Pi 3 happily connected over channel 13. Use sudo BRANCH=next rpi-update to check out the new kernel and firmware. Disclaimer: it may have been something else, I also did a dist-upgr...
by lb
Wed Mar 02, 2016 4:12 pm
Forum: General discussion
Topic: Future gpu upgrades
Replies: 47
Views: 8190

Re: Future gpu upgrades

What about Qualcomm? Most of their SoCs are pretty versatile and they seem to be one of the more open manufacturers. Plus there are Open Source GPU drivers available already.
by lb
Wed Mar 02, 2016 12:36 pm
Forum: General discussion
Topic: AArch64 code execution on Raspberry Pi3.
Replies: 36
Views: 15816

Re: AArch64 code execution on Raspberry Pi3.

I don't see the problem. If i needed to run an 64bit ARM distro , i know where to get them. Getting it to run on the Pi would up to me. Why do i need to wait for official Raspbian images to come out ? It's unfortunately not that easy. The kernel needs some work to be able to boot in AArch64 mode on...
by lb
Wed Mar 02, 2016 12:04 pm
Forum: Advanced users
Topic: RPI3: Wireless and Bluetooth antenna
Replies: 13
Views: 7030

Re: RPI3: Wireless and Bluetooth antenna

Uhm, just scrape away a bit of the soldermask? Looks like a PCB design error, but it's not a big deal.
by lb
Tue Mar 01, 2016 7:30 pm
Forum: General discussion
Topic: Appeal to the addition of ADC for the new version of RPI
Replies: 18
Views: 1579

Re: Appeal to the addition of ADC for the new version of RPI

Maybe an Arduino+Pi hybrid would be nice for some people, but adding even more stuff to the board will of course raise prices and it's unlikely to even fit.

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