Go to advanced search

by jdb
Fri Jul 12, 2019 12:55 pm
Forum: General discussion
Topic: Pi4 GPIO header disaster
Replies: 26
Views: 1735

Re: Pi4 GPIO header disaster

Can you post a close up macro shot of the GPIO connector plastic surrounding the pins and the underside of the Pi? Don't upload the image to the forum, use imgur or similar for a full-resolution image.
by jdb
Fri Jul 12, 2019 12:29 pm
Forum: General discussion
Topic: I didn't think the usb c power thing was a big deal...
Replies: 92
Views: 5610

Re: I didn't think the usb c power thing was a big deal...

Many thousands of devices are now in the hands of end-users. If this *were* a widespread issue, why aren't the forums flooded with posts with titles like "I plugged my Pi 4 in and it doesn't turn on - no LEDs or anything"? Either users have suddenly got spectacularly good at googling their problem (...
by jdb
Thu Jul 11, 2019 7:37 pm
Forum: General discussion
Topic: RPi4 - MicroSD card speed classes supported?
Replies: 18
Views: 2871

Re: RPi4 - MicroSD card speed classes supported?

I have some USB3 tiny 32GB Lexar USB sticks I use for booting 3B+. Will they be faster on the Pi4's when USB boot is sorted? Will USB sticks be an alternative to SSD's? Never had a USB3 Pi before. At some point uSD's are more expensive than USB and SSD. If they are not faster you are only paying fo...
by jdb
Thu Jul 11, 2019 5:50 pm
Forum: Advanced users
Topic: Analogue audio redux
Replies: 78
Views: 26055

Re: Analogue audio redux

From my reading of the assembler loop, you are "oversampling" by repeating the input sample used for the quantisation and noise shaping, correct? This is suboptimal as zero-order-hold (what you're doing) does not significantly band-limit the input spectrum. Noise shaping only works effectively if th...
by jdb
Wed Jul 10, 2019 3:47 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 USB Power Issues? RTL-SDRs
Replies: 15
Views: 3423

Re: Raspberry Pi 4 USB Power Issues? RTL-SDRs

https://github.com/raspberrypi/linux/issues/3060#issuecomment-510107304 The bug has been identified - the VLI chip is doing a bad thing. Dunno how to go about fixing it yet - I need to better understand the mechanisms used in the driver before I can make an informed change to cope with the hardware ...
by jdb
Wed Jul 10, 2019 2:17 pm
Forum: HATs and other add-ons
Topic: PoE hat, Raspberry Pi 4, not able to power off
Replies: 59
Views: 6722

Re: PoE hat, Raspberry Pi 4, not able to power off

OUt of interest, what happens if you add a nontrivial load to the 5V GPIO pin? Can you add a bunch of LEDs/resistors such that you draw ~40-50mA at 5V?
by jdb
Wed Jul 10, 2019 9:40 am
Forum: Advanced users
Topic: Pi4 vs Pi3 Audio Performance
Replies: 9
Views: 1256

Re: Pi4 vs Pi3 Audio Performance

The usual suspects:
- Is audacity generating 16-bit samples and storing as 24-bit?
- Dithering at 16-bit resolution?
- Resampling using a suboptimal filter?
by jdb
Tue Jul 09, 2019 9:31 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 344
Views: 68842

Re: Raspberry Pi 4 usb boot?

I think it’s the stuff that’s “piling up” that is causing some of the disenfranchisement. Can’t use most USB-C chargers, can’t USB boot, video acceleration is broken, HDMI problems popping up, etc.. The Pi is an amazing device. Sure. But the devs should have held off and provided more testing befor...
by jdb
Tue Jul 09, 2019 9:26 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 344
Views: 68842

Re: Raspberry Pi 4 usb boot?

Sure, for customer provisionable things. Would it be naive on my part to hope that a few bytes of actual OTP be reserved for end-user use? We've previously allowed for customer OTP rows to be programmed for e.g compute module customers that want to key certain software to certain installations. Tha...
by jdb
Tue Jul 09, 2019 11:46 am
Forum: Troubleshooting
Topic: RPi4/Buster data corruption on external SSD
Replies: 5
Views: 526

Re: RPi4/Buster data corruption on external SSD

Oof, that's nasty. What does hdparm -W report? Do you get the same corruption if you disable the drive write cache with hdparm -W0?
by jdb
Tue Jul 09, 2019 10:32 am
Forum: Troubleshooting
Topic: Pi4 && Aeotec Z-Wave USB Stick Gen5
Replies: 21
Views: 6465

Re: Pi4 && Aeotec Z-Wave USB Stick Gen5

Is the hub a USB3.0 or USB2.0 hub?
by jdb
Tue Jul 09, 2019 9:38 am
Forum: Troubleshooting
Topic: I think my pi 4 is dead
Replies: 13
Views: 1005

Re: I think my pi 4 is dead

I hope its ok to comment in here, but I'm having terrible trouble with my Pi4 and I'm not sure what to try next. I bought Pi4 and preloaded card, when I set it up I got 4 flashing green lights, so thought the memory card might need formatting. I did so and loaded Noobs, but got 4 flashing green lig...
by jdb
Tue Jul 09, 2019 8:37 am
Forum: Troubleshooting
Topic: I can´t boot from usb in pi 4
Replies: 63
Views: 10802

Re: I can´t boot from usb in pi 4

kyliael wrote:
Tue Jul 09, 2019 8:29 am
PeterO wrote:
Tue Jul 09, 2019 8:09 am
I assume you'll be giving it away to someone more deserving then ?
PeterO
Or just put in a drawer until I can update it to use it.
What's stopping you from running the root filesystem on a USB drive?
by jdb
Mon Jul 08, 2019 3:30 pm
Forum: Troubleshooting
Topic: Pi4 USB keyboard issues on boot
Replies: 7
Views: 534

Re: Pi4 USB keyboard issues on boot

In the case where the errors show up in the kernel log prior to a successful re-plug, the device is being misidentified as a full-speed device.

Do you get the same behaviour when using a USB2.0 hub between the Pi and the device in question?
by jdb
Mon Jul 08, 2019 11:14 am
Forum: Troubleshooting
Topic: Pi4 && Aeotec Z-Wave USB Stick Gen5
Replies: 21
Views: 6465

Re: Pi4 && Aeotec Z-Wave USB Stick Gen5

This is a known issue. The device is doing something odd which causes it to get probed as a USB3.0 device, despite there only being D+ and D- in the connector.
by jdb
Mon Jul 08, 2019 11:05 am
Forum: Troubleshooting
Topic: I can´t boot from usb in pi 4
Replies: 63
Views: 10802

Re: I can´t boot from usb in pi 4

Nope. Old-school way is all of /boot on the SD card and / (root file system) on the USB drive, with cmdline.txt pointing to that. You should also edit /etc/fstab to mount the SD card as /boot, so that kernel and firmware updates are properly applied. ^ Use this method to run the root filesystem fro...
by jdb
Mon Jul 08, 2019 9:23 am
Forum: Compute Module
Topic: USB 2.0 Dropped frames
Replies: 23
Views: 2676

Re: USB 2.0 Dropped frames

No, I'm saying that the driver option will be implemented at some point in the future and it will appear as a bit in the bitmask. It's likely to remain disabled by default unless explicitly specified.

@John - I have responded to your email - have you received my reply?
by jdb
Sat Jul 06, 2019 4:45 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 895
Views: 98395

Re: Raspberry Pi 4 Thread - general discussion

That is a typo. There is no 8GB ram chip that works with the 2711. Guess we have to wait for the Pi5 ;) I just checked my Celeron box this Pi4 is replacing , 2 x 1GB DDR2 dimms each with 16 chips. So a Pi4 with 4GB is having the equivalent of 32 rams chips in one package, thank you Mr Moore. 35 bit...
by jdb
Sat Jul 06, 2019 1:54 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 - new VLI firmware issues
Replies: 69
Views: 18170

Re: Raspberry Pi 4 - new VLI firmware issues

Thanks, starting to see a theme of adapters here...

The "data mismatch" issue has been identified - there will be an updated vl805 utility distributed at some point in the future.
by jdb
Fri Jul 05, 2019 6:28 pm
Forum: Troubleshooting
Topic: Pi4 - problem with UART baudrate (solved)
Replies: 3
Views: 330

Re: Pi4 - problem with UART baudrate

The baud rate scaling is the same issue as seen on RPI 3 and 3B+ - namely that the UART used on the GPIO pins gets its clock from the system bus clock which changes depending on system load. If you absolutely need to use GPIO 14&15 and if you don't use bluetooth devices, then add "dtoverlay=pi3-disa...
by jdb
Fri Jul 05, 2019 5:10 pm
Forum: Troubleshooting
Topic: Problem with two ssd connected on the two USB 3 ports of RPi 4
Replies: 5
Views: 274

Re: Problem with two ssd connected on the two USB 3 ports of RPi 4

Firmware 137a8 is causing issues with many USB3.0 devices - please revert to 13701.
by jdb
Thu Jul 04, 2019 9:34 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 344
Views: 68842

Re: Raspberry Pi 4 usb boot?

James, you and your colleagues are doing a wonderful job but please don't feed the trolls. On the contrary, this is where the fun begins. The product has been in the wild for [checks notes] 10 days now and we're frankly disappointed about the quality of the troll armada that has followed this Pi re...
by jdb
Thu Jul 04, 2019 9:28 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 344
Views: 68842

Re: Raspberry Pi 4 usb boot?

27 million RPi sold does not equal 27 million sd cards solds, your math is dumb, as a teacher I can tell you our students do not own sd cards for their projects, every classroom using rpis has one sd to unlock flash drive booting. ... hold on I forget to type words in caps ... DUMB ... pickup a pho...
by jdb
Thu Jul 04, 2019 8:46 pm
Forum: General discussion
Topic: Why doesn't the next Pi add...? Why doesn't the Pi 4 have...? The definitive debunking!
Replies: 68
Views: 3611

Re: Why doesn't the next Pi add...? Why doesn't the Pi 4 have...? The definitive debunking!

Less impressive, in my opinion only, because it doesn't meet my needs! Frankly the 3B hit the sweet spot as far as I'm concerned, and the 0W for smaller applications. Things like the introduction of built-in wireless, Bluetooth, and quad-cores were impressive, this... not so much! But take it with ...

Go to advanced search