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by jdb
Wed Sep 15, 2021 9:12 am
Forum: General discussion
Topic: Does the official usb-c power supply have data lines within?
Replies: 13
Views: 1040

Re: Does the official usb-c power supply have data lines within?

basicsofcomputing wrote:
Tue Sep 14, 2021 4:58 pm
Need to build a y-splitter cable for my pi-kvm project. Can't find good quality 5V 3A power supply with usb a connectors.

So does the official usb c power supply have data lines within that I can splice extra wires onto?
No. It has a coaxial 2-core cable.
by jdb
Tue Sep 14, 2021 11:49 am
Forum: General discussion
Topic: New ISS Pi in space, Pi4, new SenseHAT, HD camera, Corel and extra.
Replies: 21
Views: 1730

Re: New ISS Pi in space, Pi4, new SenseHAT, HD camera, Corel and extra.

alphanumeric wrote:
Tue Sep 14, 2021 11:08 am
Is it actually a new Sense Hat? Or just two more sensors added separately? I watched the video, but I'm still not sure which it is?
It's a v2 HAT. Added sensors plus the annoying bug with Pi4 that illuminates the matrix on a reboot is fixed.
by jdb
Sat Sep 11, 2021 4:53 pm
Forum: Compute Module
Topic: Having trouble with AMD Radeon RX 6700 XT on CM4
Replies: 3
Views: 768

Re: Having trouble with AMD Radeon RX 6700 XT on CM4

"Firmware transaction timeout" usually means the VPU has crashed. From your linked issue on freedesktop.org, the memcpy_fromio boils down to this: https://elixir.bootlin.com/linux/latest/source/arch/arm/lib/copy_template.S Which uses optimised loads and stores to access the PCIe outbound w...
by jdb
Fri Sep 03, 2021 8:57 am
Forum: Troubleshooting
Topic: STICKY: If you have a Raspberry Pi 4 and are getting bad speeds transferring data to/from USB3.0 SSDs, read this
Replies: 254
Views: 360236

Re: STICKY: If you have a Raspberry Pi 4 and are getting bad speeds transferring data to/from USB3.0 SSDs, read this

The "solution" in this thread to disable UASP and use USB storage doesn't fix the underlying issue. All of these USB adapters support UASP on desktop Linux and Windows without any issues. There's something specific to the Raspberry Pi 4 hardware/software/firmware that is preventing these ...
by jdb
Fri Aug 20, 2021 10:03 pm
Forum: Off topic discussion
Topic: Eben Upton speaks...
Replies: 26
Views: 2380

Re: Eben Upton speaks...

And...all of that has to be looked at from the perspective of what process nodes are being used. The Pis SoCs are build on old or "ancient" (28nm and 40nm) process nodes. That doesn't require using cutting edge (10nm, 7nm, 5nm) fabs to make the chips. (The DRAM chips are probably closer t...
by jdb
Wed Aug 18, 2021 7:54 pm
Forum: Raspberry Pi OS
Topic: Latest apt update kills bluetooth on Pi400
Replies: 32
Views: 4298

Re: Latest apt update kills bluetooth on Pi400

People appear to have narrowed it down to a version of the bluez package being the issue. It would be useful if each package version was tested in turn, to find the first broken one. fyi I get the following available packages on a default install: pi@raspberrypi:~ $ apt list -a bluez Listing... Done...
by jdb
Wed Aug 18, 2021 7:46 pm
Forum: Raspberry Pi OS
Topic: Latest apt update kills bluetooth on Pi400
Replies: 32
Views: 4298

Re: Latest apt update kills bluetooth on Pi400

electronicstoday wrote:
Thu Aug 12, 2021 12:50 am
There's this thing called "quality control", the likes of which I feel the "foundation" are yet to discover.
Tedious. Enjoy your enforced holiday.
by jdb
Sat Aug 14, 2021 9:24 pm
Forum: Advanced users
Topic: Automatic reboot on kernel panic during boot
Replies: 13
Views: 1258

Re: Automatic reboot on kernel panic during boot

There's an rpi-update kernel contains a potential fix for this issue. Please test and report back. Note that rpi-update should not be run on systems in the field without immediate access - usage is for test purposes only.
by jdb
Wed Aug 11, 2021 5:53 pm
Forum: Advanced users
Topic: Automatic reboot on kernel panic during boot
Replies: 13
Views: 1258

Re: Automatic reboot on kernel panic during boot

When you say "related" to the Github issue, what proves that this is the case?

Please post the kernel messages printed during boot (image of the screen or UART console capture).
by jdb
Wed Aug 11, 2021 2:25 pm
Forum: Off topic discussion
Topic: Pi4 video output via a usb video capture device feasible? if so which device?
Replies: 10
Views: 720

Re: Pi4 video output via a usb video capture device feasible? if so which device?

4K capture cards are expensive and typically need direct PCI express connection if you want live video.

https://www.amazon.co.uk/dp/B07VWXCXM7

An HDMI kvm switcher with a forced EDID on the Pi is usually the way to go.
by jdb
Sat Jul 17, 2021 5:16 pm
Forum: Advanced users
Topic: Analogue audio redux
Replies: 125
Views: 52163

Re: Analogue audio redux

Could this also be useful and feasible on Raspberry Pi Pico (using PWM and/or PIO)? Pico lacks the fixed-point throughput to do anything close to the filtering offered by the VPU, so the architecture in this driver won't port across. There's an example for a pwm audio implementation in pico-playgro...
by jdb
Fri Jul 16, 2021 9:43 pm
Forum: General discussion
Topic: Registration Issue - gTLD emails invalid
Replies: 2
Views: 257

Re: Registration Issue - gTLD emails invalid

What gTLD was rejected? Bear in mind we have a weapons-grade spamfilter.
by jdb
Thu Jul 15, 2021 7:33 pm
Forum: Off topic discussion
Topic: I have a dream
Replies: 8
Views: 986

Re: I have a dream

Feature request thread. Locked.
by jdb
Tue Jul 13, 2021 5:50 pm
Forum: General
Topic: Realistically will we ever see more variants of this chip?
Replies: 39
Views: 2342

Re: Realistically will we ever see more variants of this chip?

- internal oscillator good enough for usb/uart Good call - I can live without USB and I can go slow on the debug serial or GPS or whatever so don't need it to be hugely stable or run at much more than 2 or 4MHz. This is hard to do without exploding the complexity of the oscillator. The ring oscilla...
by jdb
Tue Jul 13, 2021 5:36 pm
Forum: General
Topic: which GPIOs are connected to which IOVDD ?
Replies: 1
Views: 216

Re: which GPIOs are connected to which IOVDD ?

The IOVDD domain is routed through each digital IO pad on the die. See section 5.2.2.2 in the datasheet.

All IOVDD pads must be connected, and suitably decoupled, for ESD tolerance and GPIO performance to be met.
by jdb
Sun Jul 11, 2021 6:00 pm
Forum: General
Topic: RP2040 with internal oszilator
Replies: 6
Views: 437

Re: RP2040 with internal oszilator

yeah I read that (1.8 to 12MHz) - but I thought this wide range is while booting and I assumed, that this will stabilize later. How does this work with the Bootloader? Does the Bootloader in the boot rom use external clock for its usb support? and what happens when there is none? ROM bootloader + U...
by jdb
Sun Jul 11, 2021 5:53 pm
Forum: SDK
Topic: ROM
Replies: 9
Views: 769

Re: ROM

WizIO wrote:
Sun Jul 11, 2021 2:29 pm
my question is:

is OTP ( One - Time - Programing ) or not ?
I'm assuming that you're asking about chip-internal storage rather than the bootloader ROM - there are no one-time programmable (OTP) elements or flash memory anywhere in RP2040.
by jdb
Sun Jul 11, 2021 5:49 pm
Forum: General
Topic: Realistically will we ever see more variants of this chip?
Replies: 39
Views: 2342

Re: Realistically will we ever see more variants of this chip?

It took three years to make this RP2040 version. It would be a shame to waste that IP. We built two things while building RP2040: - RP2040 - A business unit that can make ASICs Variants of RP2040? Most likely yes, but only once we've worked out where RP2040 fits and where it doesn't fit, and if it'...
by jdb
Fri Jul 09, 2021 9:32 pm
Forum: General discussion
Topic: [Solved] How to remap Logitech (or other) keyboards with GUI
Replies: 5
Views: 310

Re: Keyboard remap needed at boot

if you don't know FOR CERTAIN, please do not post speculative posts, as it will waste time and space. Because of your (continuing) attitude I am not going to waste my time looking to see if I can come up with a solution for you. Why did you waste time bothering to making a post, then? And in doing ...
by jdb
Fri Jul 09, 2021 9:26 pm
Forum: General discussion
Topic: Videocore 6 documentation
Replies: 40
Views: 2288

Re: Videocore 6 documentation

What does that statement have to do with documentation for Videocore? As an open-source hardware design, RISC-V would presumably be packaged with an open-source GPU, or at least an open-source friendly GPU like Mali. Please provide evidence that Mali is an "open-source friendly" GPU. Btw,...
by jdb
Wed Jul 07, 2021 10:12 pm
Forum: General discussion
Topic: Videocore 6 documentation
Replies: 40
Views: 2288

Re: Videocore 6 documentation

sandwich wrote:
Wed Jul 07, 2021 10:10 pm
jamesh wrote:
Wed Jun 16, 2021 10:35 pm
Eben no longer works for Broadcom, full time CEO of Trading.
If that's the case, hopefully he is not beholden to them any more. Maybe a RISC-V variant of the Pi is possible?
What does that statement have to do with documentation for Videocore?
by jdb
Wed Jul 07, 2021 10:11 pm
Forum: General discussion
Topic: Pi's history of weird, niche hardware choices.
Replies: 55
Views: 2746

Re: Pi's history of weird, niche hardware choices.

I have never had a single micro-USB connector fail on any product I have owned. I had to replace several microusb cables that first work fine for months but later start to show low voltage warnings with Pi3b, Pi3b+. I guess it is some sort of oxidization inside the microusb connector (due to repeat...
by jdb
Wed Jul 07, 2021 7:34 pm
Forum: General discussion
Topic: Pi's history of weird, niche hardware choices.
Replies: 55
Views: 2746

Re: Pi's history of weird, niche hardware choices.

To this day I still don't understand why there is this pervading opinion that "we should have used a barrel plug" despite them being literally the most garbage power connectors in commodity usage . Aside from there being no common standard or convention on plug dimension versus voltage, po...
by jdb
Wed Jul 07, 2021 3:04 pm
Forum: General discussion
Topic: What happens if you add pci=pcie_bus_safe to cmdline.txt on a Pi 4?
Replies: 25
Views: 2150

Re: What happens if you add pci=pcie_bus_safe to cmdline.txt on a Pi 4?

Yes. Probably by quite a bit if it supports 512 byte maxpackets.

Edit: Phreak post GET
by jdb
Wed Jul 07, 2021 2:59 pm
Forum: Off topic discussion
Topic: Razer Deathadder V2 DPI Switches
Replies: 1
Views: 612

Re: Razer Deathadder V2 DPI Switches

What happens if you add usbhid.mousepoll=0 to /boot/cmdline.txt?

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