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by jdb
Mon Jun 01, 2020 4:07 pm
Forum: General discussion
Topic: More amperage on the new RPi4 8GB?
Replies: 9
Views: 1016

Re: More amperage on the new RPi4 8GB?

This video is plain wrong. Transcript starting from your timestamp: And if we look close enough some of the power components have been swapped around on the board, and this mainly has to do with power input to the board itself [1] They've moved the switchmode supply closer to the USB type-C port on ...
by jdb
Sun May 31, 2020 10:40 am
Forum: Advanced users
Topic: Raspberry Pi 4 VL805 firmware release 0138a1
Replies: 35
Views: 10709

Re: Raspberry Pi 4 VL805 firmware release 0138a1

NB 2: This upgrade method has no effect on Pi 4 8GB boards, because the VLI EEPROM is a no-fit part. The VLI firmware has been rolled into the bootloader EEPROM. Ok, this is completely understandable. But when will the firmware version 0138a1 be available as beta ? Is there any chance that this fir...
by jdb
Sun May 31, 2020 10:34 am
Forum: General discussion
Topic: Future Feature Requests (community)
Replies: 3
Views: 318

Re: Future Feature Requests (community)

Would love to see a M.2 Slot added to the raspberry Pi4 or failing this a connector similar to the camera connector so a ribbon cable could link to an attachment which could accept a m.2 socket(less perfered option) While I realise that you can use a USB3 external drive this means giving up a USB3 ...
by jdb
Sat May 30, 2020 5:53 pm
Forum: Off topic discussion
Topic: Raspberry pi issues that were never fixed even for the new Pi 4
Replies: 44
Views: 4307

Re: Raspberry pi issues that were never fixed even for the new Pi 4

jamesh wrote:
Sat May 30, 2020 10:29 am

But as predicted, he has not posted again!
How disappointing. But after 2 pages of posts directly refuting the OP's evidence-free assertions, I think it's time to lock the thread.
by jdb
Fri May 29, 2020 4:08 pm
Forum: Troubleshooting
Topic: 2 x Pi4 Locking up and freezing when using more than one USB3.0 port
Replies: 14
Views: 664

Re: 2 x Pi4 Locking up and freezing when using more than one USB3.0 port

Hotplug is fine on anything that's a Pi 1 B+ or later. We have enough reservoir capacitance on VBus downstream of the USB current limiting switch to handle a *compliant* device getting hotplugged. Compliant means they have no more than 10uF of decoupling capacitance on Vbus, at least on initial conn...
by jdb
Thu May 28, 2020 3:46 pm
Forum: General discussion
Topic: Why release an 8gb model without upgrading the processor?
Replies: 35
Views: 2742

Re: Why release an 8gb model without upgrading the processor?

Again I will posit the question as to why an 8gb model has been released without a processor upgrade? Surely at some point processor speed has to catch up with memory? Why release a 2GB model of Pi 4 without upgrading the processor over the 1GB model? Why release a 4GB model of Pi 4 without upgradi...
by jdb
Thu May 28, 2020 3:44 pm
Forum: Troubleshooting
Topic: Hard drive not detected, problem with dwc_otg_hcd
Replies: 2
Views: 202

Re: Hard drive not detected, problem with dwc_otg_hcd

The message about UAS does not mean that the drive won't work with a Pi 3 B+.

Your drive is disconnecting halfway through spinning up. Plug it in to a powered USB hub, as it is probably drawing too much current during spinup.
by jdb
Thu May 28, 2020 12:37 pm
Forum: General discussion
Topic: USB-MSD boot EEPROM first update - 2020-05-28
Replies: 234
Views: 28124

Re: USB-MSD boot EEPROM update - 2020-05-28

Yup, you were tripping over the bug that's fixed in the 2020-05-28 release.
by jdb
Thu May 28, 2020 11:40 am
Forum: Troubleshooting
Topic: [Pi 4B] USB ports heavily lag or disconnect completely
Replies: 7
Views: 660

Re: [Pi 4B] USB ports heavily lag or disconnect completely

Good to know that things have improved. XHCI has the concept of two independent buses for USB2.0 and USB3.0 - as seen in your lsusb output. USB3.0 hubs are actually a USB2.0 hub in parallel with a USB3.0 hub, and will appear "attached" in two places. The only added complexity for our particular host...
by jdb
Thu May 28, 2020 9:35 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Hardware PWM frequency on Pi 4
Replies: 10
Views: 1369

Re: Hardware PWM frequency on Pi 4

vcgencmd measure_clock pwm is more reliable as it directly queries a frequency counter. If the firmware decides to change the PWM clock (normally done once, when the audio driver is first opened) then it will overwrite any setup that Linux did.
by jdb
Thu May 28, 2020 8:38 am
Forum: General discussion
Topic: USB-MSD boot EEPROM first update - 2020-05-28
Replies: 234
Views: 28124

Re: USB-MSD boot EEPROM update - 2020-05-26

... In updating to the later bootloader beta [Wed 27 May 11:50:19 UTC 2020 (1590580219)] ... There is a new beta release (May 27 2020 18:24:25) with a fix for this VL805 self-update bug. Thanks. I updated the bootloader to: Wed 27 May 17:47:29 UTC 2020 (1590601649) Now after a vl805 update, everyth...
by jdb
Wed May 27, 2020 10:53 am
Forum: Off topic discussion
Topic: Raspberry pi issues that were never fixed even for the new Pi 4
Replies: 44
Views: 4307

Re: Raspberry pi issues that were never fixed even for the new Pi 4

I'm approving this post, even though a first-post unsubstantiated rant usually doesn't bode well for the thread. Let's take these two: -Pis must be taken under INTENSIVE care for it to last for 4-5 years. average caring makes it last for 4 months to a year. Patently false. Until I bought a real NAS,...
by jdb
Wed May 27, 2020 8:26 am
Forum: Advanced users
Topic: [RPI4] How to using alternative uart , SPI ,I2C ?
Replies: 1
Views: 161

Re: [RPI4] How to using alternative uart , SPI ,I2C ?

Additional interfaces can be activated with devicetree overlays - ones that are available on your current SD card are listed in /boot/overlays/README See for example uart3/uart4 overlays. See the datasheet for GPIO alternate functions for a comprehensive list of what interfaces appear on which pins ...
by jdb
Tue May 26, 2020 8:42 pm
Forum: General discussion
Topic: Will gerber files be released for the Raspberry Pi
Replies: 8
Views: 653

Re: Will gerber files be released for the Raspberry Pi

bjtheone wrote:
Tue May 26, 2020 7:56 pm

Note to moderators: I am still waiting for my million dollars from the schematic thread. "I needs it"
It'll be in the very next Pi product that you buy.
Willy Wonka called and said that he has a fool-proof method of getting Totally Random™ competition winners. Guy seems legit.
by jdb
Tue May 26, 2020 8:36 pm
Forum: Troubleshooting
Topic: RPi4 Rev 1.1. SoC Temperature readings...
Replies: 9
Views: 497

Re: RPi4 Rev 1.1. SoC Temperature readings...

The question is, ho accurate (repeatable and calibrated) is the sensor and related circuitry? My guess is that anything beyond integer degrees is wholly spurious and does not represent extra precision. It might reflect a trend in heating or cooling, but I doubt you ever need to detect and react to ...
by jdb
Sun May 24, 2020 8:41 pm
Forum: Advanced users
Topic: I need raspberry pi 3 b+ full schematic diagram.
Replies: 9
Views: 746

Re: I need raspberry pi 3 b+ full schematic diagram.

rckanta wrote:
Sun May 24, 2020 5:10 am
I need raspberry pi 3 b+ full schematic diagram.
Why do you need the full schematic diagram of the Raspberry Pi 3 Model B+?
by jdb
Fri May 22, 2020 7:53 pm
Forum: General discussion
Topic: 110V DC for USB-C Power Supply for Raspberry Pi 4
Replies: 27
Views: 1503

Re: 110V DC for USB-C Power Supply for Raspberry Pi 4

I must admit, until this thread, I had no idea. DC over 48V or so worries me, though, so I won't be experimenting... In the previous decade, I was once called out to a fault at Peterhead power station on one of their 240VDC "station battery chargers". The battery charger was the size of your averag...
by jdb
Fri May 22, 2020 12:30 pm
Forum: General discussion
Topic: 110V DC for USB-C Power Supply for Raspberry Pi 4
Replies: 27
Views: 1503

Re: 110V DC for USB-C Power Supply for Raspberry Pi 4

The only problem is that the new Raspberry Pi 15.3W USB-C Power Supply does not seem to support an 110V DC input. However, the 110V DC are the only voltage supply that we can use. Out of curiosity, where do you only have 110V DC? 110V dc is common for LV and MV switchgear trip & close supplies. Met...
by jdb
Thu May 21, 2020 6:44 pm
Forum: Troubleshooting
Topic: RPi4-4GB: How easy to blow up the USB chip?
Replies: 22
Views: 920

Re: RPi4-4GB: How easy to blow up the USB chip?

Just a thought but don't different speed USB devices use different signalling voltages on the data lines ? Yes, true for every major revision of the USB spec. I would have thought USB controllers and devices would be designed with that in mind but is it possible a delay or error in reconfiguring an...
by jdb
Thu May 21, 2020 6:35 pm
Forum: General discussion
Topic: Raspberry Pi 4 USB mass storage beta (beta means it not ready yet, and not officially released!)
Replies: 282
Views: 88754

Re: Raspberry Pi 4 USB mass storage beta

It's a consequence of having no SD card in the slot - it's being polled several times a second for a card being inserted. This causes the activity LED to light.
by jdb
Wed May 20, 2020 5:40 pm
Forum: General discussion
Topic: Raspberry Pi 4 USB mass storage beta (beta means it not ready yet, and not officially released!)
Replies: 282
Views: 88754

Re: Raspberry Pi 4 USB mass storage beta

thatchunkylad198966 wrote:
Wed May 20, 2020 5:26 pm
Sorry if this has been asked... do we need usb-storage quirks?
No. The bootloader uses mass-storage as the boot protocol and is completely unrelated to Linux's choice of access interface.
by jdb
Wed May 20, 2020 11:14 am
Forum: Advanced users
Topic: Split post: VLI eeprom upgrade issues
Replies: 17
Views: 750

Re: Split post: VLI eeprom upgrade issues

Please try this alternate method of flashing the VLI EEPROM - - Boot raspbian (with or without broken USB) - Remove all the recovery.bin and vl805* files from the /boot directory on your SD card - Download the legacy vl805 programming tool from here : https://github.com/raspberrypi/rpi-eeprom/raw/ma...
by jdb
Sat May 16, 2020 6:43 pm
Forum: Troubleshooting
Topic: RPi4 USB Over-current change issue
Replies: 13
Views: 924

Re: RPi4 USB Over-current change issue

Would replacing the USB ports/ USB Vbus monitor IC be a viable way to fix the issue You can completely bypass the USB chip by connecting the Pi's 5V to the USB Vusb pins. You could try that temporarily to see if it resolves the issue. That would not be suitable, and may cause worse damage, if there...
by jdb
Fri May 15, 2020 3:51 pm
Forum: Troubleshooting
Topic: [Pi 4B] USB ports heavily lag or disconnect completely
Replies: 7
Views: 660

Re: [Pi 4B] USB ports heavily lag or disconnect completely

The firmware update worked, as seen in the "current" version field. The updater is complaining because your bootloader is still out of date. I suggest testing each peripheral device in turn to see if it works by itself. Omit all the hubs and the KVM switcher - Does the webcam FPS go up if it's by it...
by jdb
Fri May 15, 2020 12:23 pm
Forum: Troubleshooting
Topic: [Pi 4B] USB ports heavily lag or disconnect completely
Replies: 7
Views: 660

Re: [Pi 4B] USB ports heavily lag or disconnect completely

What happens if you update the USB controller firmware as described here? https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=273027 Please also post a full lsusb -v and dmesg output. I note that you have a full-speed 4-port hub with HID devices plugged in - what model is it, and can you substit...

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