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by jdb
Tue Jul 09, 2019 11:46 am
Forum: Troubleshooting
Topic: RPi4/Buster data corruption on external SSD
Replies: 5
Views: 401

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: 20
Views: 2377

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: 885

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: 74
Views: 6468

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: 451

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: 20
Views: 2377

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: 74
Views: 6468

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: 2226

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: 805
Views: 76192

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: 68
Views: 11559

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: 218

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: 224

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: 125
Views: 24874

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: 125
Views: 24874

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: 3212

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 ...
by jdb
Thu Jul 04, 2019 8:17 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: 3212

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

I'd like an answer to my question. I'm curious. What about the Pi 4 makes it the "least impressive offering" of all previous product releases? What I like about the Pi4 - Enhanced CPU - USB 3.0 - GigE - Faster SD? What I don't like. - Dual HDMI - Power consumption and thermal - Do I really need 1 G...
by jdb
Thu Jul 04, 2019 7:34 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: 3212

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

I'd like an answer to my question.
jdb wrote:
Thu Jul 04, 2019 6:43 pm
I'm curious. What about the Pi 4 makes it the "least impressive offering" of all previous product releases?
by jdb
Thu Jul 04, 2019 6:43 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: 3212

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

Don't get me wrong. Though the PI4 is the most disappointing (or should I say, the least impressive) Raspberry offering so far, I still like the platform but will nevertheless dock them a few points for their veering to crass commercialism. I'm curious. What about the Pi 4 makes it the "least impre...
by jdb
Thu Jul 04, 2019 3:41 pm
Forum: General discussion
Topic: Raspi 4 Turning off USB Power, Permission denied
Replies: 2
Views: 164

Re: Raspi 4 Turning off USB Power, Permission denied

That command affects the dwc_otg controller, not the xhci controller. You should be able to use "uhubctl" to power off the ports.
The Ethernet port on Pi4 is independent of anything to do with USB.
by jdb
Thu Jul 04, 2019 1:37 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 - new VLI firmware issues
Replies: 68
Views: 11559

Re: Raspberry Pi 4 - new VLI firmware issues

@jackd12001 can you try the U1/U2 powersave disable as described above?
by jdb
Thu Jul 04, 2019 12:03 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 - new VLI firmware issues
Replies: 68
Views: 11559

Re: Raspberry Pi 4 - new VLI firmware issues

Can you post the full lsusb of your SSD adapter?
by jdb
Thu Jul 04, 2019 10:32 am
Forum: Advanced users
Topic: Increasing MTU on Pi 4
Replies: 3
Views: 409

Re: Increasing MTU on Pi 4

In theory the hardware supports up to 16k packet sizes but increasing the MTU will, as you say, need tweaks to the packet buffer configuration. My hunch is that the buffers need to end up 4k page-sized for compatibility with the rest of Linux which means jumbo frames span more than 1 tx or rx buffer...
by jdb
Thu Jul 04, 2019 8:29 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 - new VLI firmware issues
Replies: 68
Views: 11559

Re: Raspberry Pi 4 - new VLI firmware issues

A possible cause of low performance even with the stock VLI firmware could be UAS blacklisting - on an x86 pc with 4.19.5 my SSD adapter is downgraded to mass-storage, but on the Pi it's quite happy using UAS transport.
Ignore this - I had a leftover module blacklist from testing on the PC.
by jdb
Wed Jul 03, 2019 8:25 pm
Forum: General discussion
Topic: RP4 without ESD protection shipped
Replies: 15
Views: 742

Re: RP4 without ESD protection shipped

The boxes have a conductive coating. We do this to remove the plastic ESD baggie that all previous models have shipped in - which usually ends up in landfill as it's unrecycleable :( Also your fears about ESD are unfounded - all of the interfaces are safe against 2kV HBM discharges - which includes ...

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