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by jdb
Fri Sep 20, 2019 11:59 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: PWM input clock (clk_pwm) frequency for Pi4
Replies: 5
Views: 126

Re: PWM input clock (clk_pwm) frequency for Pi4

On pi 4 the oscillator frequency is 54MHz.
by jdb
Fri Sep 20, 2019 6:37 am
Forum: Advanced users
Topic: USB 3.0 OTG?
Replies: 9
Views: 302

Re: USB 3.0 OTG?

No, the controller swaps out the dwc_otg one and uses the same USB2.0 pins.
by jdb
Thu Sep 19, 2019 3:11 pm
Forum: Troubleshooting
Topic: VLI firmware v2.0 - powersaving features enabled
Replies: 59
Views: 4196

Re: VLI firmware v2.0 - powersaving features enabled

One last bump...
by jdb
Wed Sep 18, 2019 1:40 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: PWM input clock (clk_pwm) frequency for Pi4
Replies: 5
Views: 126

Re: PWM input clock (clk_pwm) frequency for Pi4

Defaults to 107.14MHz in the firmware setup. The PLL channel that used to generate the 100MHz now runs at 750MHz instead of 500, so the fw uses 750/7. Note that both the audio and GPIO PWM blocks use the same clock divider, so changing it after the audio jack has been used will likely lead to distor...
by jdb
Wed Sep 18, 2019 10:51 am
Forum: Bare metal, Assembly language
Topic: PCIe outbound address restrictions
Replies: 5
Views: 231

Re: PCIe outbound address restrictions

The outbound window is fixed in the bus address range 0x6_0000_0000 to 0x7_ffff_ffff. There can be up to 3 subdivisions of this window as there's 3 sets of window registers.

Also, the smallest window size supported by the outbound window registers is 1MB.
by jdb
Tue Sep 17, 2019 10:57 am
Forum: Troubleshooting
Topic: Pi4 not seeing HDDs attached to HUB
Replies: 7
Views: 154

Re: Pi4 not seeing HDDs attached to HUB

Is it just a problem with this particular hub?
Do you have a different USB2.0 hub to test (with the pendrive, since that's a less demanding device in comparison to a HDD).
by jdb
Sat Sep 14, 2019 9:55 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 534
Views: 136627

Re: Raspberry Pi 4 temperature

PeterO wrote:
Sat Sep 14, 2019 9:14 pm
rpdom wrote:
Sat Sep 14, 2019 8:01 pm
bensimmo wrote:
Sat Sep 14, 2019 6:28 pm
Why the new forum account?
Because the old one had been given a holiday from the forums and "pro" thought they could sneak past the rule by creating a new account?
With , one expects, predictable consequences !
PeterO
Correct.
by jdb
Fri Sep 13, 2019 3:39 pm
Forum: Troubleshooting
Topic: VLI firmware v2.0 - powersaving features enabled
Replies: 59
Views: 4196

Re: VLI firmware v2.0 - powersaving features enabled

Limit the discussion to the VLI firmware testing, please. Offtopic posts are going to get deleted.
by jdb
Thu Sep 12, 2019 7:43 pm
Forum: General discussion
Topic: BCM2711 peripherals specification document
Replies: 2
Views: 167

Re: BCM2711 peripherals specification document

It's "coming soon".

We are compiling a detailed specification of BCM2711's feature set that is not under NDA (similar in scope to the BCM2835 ARM peripherals document released many years ago for Pi 1) and will publish it when it is ready.
by jdb
Thu Sep 12, 2019 7:33 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 534
Views: 136627

Re: Raspberry Pi 4 temperature

Feel free to disagree with me, but it would be nice to actually say what you're disagreeing on, and what you're calling "half-formed opinions". They're better than just blatant criticism without any ground. Back to frying eggs on a pi 4. I'm not disagreeing with you, because that would imply there ...
by jdb
Thu Sep 12, 2019 4:31 pm
Forum: General discussion
Topic: RPI 4 USB-C supply
Replies: 37
Views: 1293

Re: RPI 4 USB-C supply

The clue is this line: The circuitry required to manage the charging rate and voltage limits for lithium ion batteries is typically part of the device being charged (such as your cell phone or laptop), not the charger. With the charging control managed by the device that a charger brick is connected...
by jdb
Thu Sep 12, 2019 2:02 pm
Forum: Troubleshooting
Topic: VLI firmware v2.0 - powersaving features enabled
Replies: 59
Views: 4196

Re: VLI firmware v2.0 - powersaving features enabled

OK, so that confirms there's no issue with the firmware update - just that the utility is leaving the chip in an odd state that can cause a shutdown hang. I can replicate the hang, but only with USB3.0 devices attached. I tested with a mass storage device (filesystem not mounted) and a USB-HDMI adap...
by jdb
Thu Sep 12, 2019 6:46 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 534
Views: 136627

Re: Raspberry Pi 4 temperature

When you look at the sales of the 4B, you can clearly see there's a market for a pi desktop replacement , and for many, the 4B isn't that one yet. It would make sense to continue the trend of more power, more options, less heat, to satisfy that market. But if you ask me, I think the pi is popular b...
by jdb
Wed Sep 11, 2019 4:01 pm
Forum: Troubleshooting
Topic: VLI firmware v2.0 - powersaving features enabled
Replies: 59
Views: 4196

Re: VLI firmware v2.0 - powersaving features enabled

The use of the PCIe bounce buffers has been known to cause variable performance, especially when operating at near 100% utilisation of the PCIe link. Can you add total_mem=3072 to /boot/config.txt prior to retesting? This will limit the available ARM memory to the bottom 3G which should remove the b...
by jdb
Wed Sep 11, 2019 1:38 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 861
Views: 88770

Re: Raspberry Pi 4 Thread - general discussion

This question also interests me. Does anyone know the answer to it? Another great product from the Raspberry Pi team. Can't wait to get my hands on one (when the 4GB ones are back in stock). I believe it has been fixed. Hi all, I have tested the I2C clock stretching feature of Raspberry Pi 4. unfor...
by jdb
Wed Sep 11, 2019 11:48 am
Forum: Troubleshooting
Topic: VLI firmware v2.0 - powersaving features enabled
Replies: 59
Views: 4196

Re: VLI firmware v2.0 - powersaving features enabled

The fact that you flashed the EEPROM twice (with the updated version) and fixed the issue suggests that something went wrong during the first flash.

Unfortunately both EEPROMs are now in a "good" state so there's not really any information that can be gotten out of them...
by jdb
Wed Sep 11, 2019 9:59 am
Forum: Troubleshooting
Topic: VLI firmware v2.0 - powersaving features enabled
Replies: 59
Views: 4196

Re: VLI firmware v2.0 - powersaving features enabled

Hesitant to make this a sticky (we have enough of them already) so - bump. I think a few more +1's for success and we put this in the announcements forum.
by jdb
Wed Sep 11, 2019 9:57 am
Forum: Advanced users
Topic: add electrolytic capacitor on power?
Replies: 23
Views: 4436

Re: add electrolytic capacitor on power?

- Don't necro old posts
- Don't flamebait other forum users.
by jdb
Wed Sep 11, 2019 9:40 am
Forum: General discussion
Topic: RPi4 pyusb and libusb1 detach kernel driver
Replies: 2
Views: 108

Re: RPi4 pyusb and libusb1 detach kernel driver

Can you post the code you are using?
by jdb
Wed Sep 11, 2019 7:59 am
Forum: General discussion
Topic: Super new to this and need help badly
Replies: 18
Views: 681

Re: Super new to this and need help badly

ProDigit wrote:
Wed Sep 11, 2019 7:34 am
If the green lan light is on, it should be working.
Especially if the orange light is flickering
Incorrect. Under stable link conditions you will see:
- Orange light solid on or solid off (speed indication)
- Green light on, but blinks when there is activity.
by jdb
Mon Sep 09, 2019 2:28 pm
Forum: Troubleshooting
Topic: VLI firmware v2.0 - powersaving features enabled
Replies: 59
Views: 4196

Re: VLI firmware v2.0 - powersaving features enabled

I can confirm that the VBus behaviour is identical across bootloader POWER_OFF_ON_HALT=0/1 and VLI firmware changes. One thing to note is that both of you are running the root on an SSD - if USB devices become inaccessible after flashing the firmware (the script rescans the bus) then a shutdown will...
by jdb
Mon Sep 09, 2019 9:05 am
Forum: Troubleshooting
Topic: VLI firmware v2.0 - powersaving features enabled
Replies: 59
Views: 4196

Re: VLI firmware v2.0 - powersaving features enabled

By removing devices do you mean the boot device or any attached? I'll measure the voltage in a bit, where is a good place to probe -ve ? The test is to remove USB devices while in the hung state and see if the Pi "wakes up". The SD card activity LED should still work and you should get the rainbow ...
by jdb
Mon Sep 09, 2019 8:46 am
Forum: Troubleshooting
Topic: VLI firmware v2.0 - powersaving features enabled
Replies: 59
Views: 4196

Re: VLI firmware v2.0 - powersaving features enabled

Weird. Injecting current into the D+/D- lines has been known to stop the PMIC from starting up as it causes leakage into the 3.3V supply. The only way that the firmware could be changing this behaviour is if Vbus isn't removed during device reset - worth investigating. Not the case in this instance...
by jdb
Sun Sep 08, 2019 5:29 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 303
Views: 51095

Re: Raspberry Pi 4 usb boot?

Then make a chainloader. USB boot is intentionally limited in scope to "find the first valid boot disk and boot from it".
by jdb
Sun Sep 08, 2019 3:46 pm
Forum: Troubleshooting
Topic: VLI firmware v2.0 - powersaving features enabled
Replies: 59
Views: 4196

Re: VLI firmware v2.0 - powersaving features enabled

"A PNY SSD" - what is it?

Is the drive enclosure USB3.0 to SATA? USB2.0 to SATA? Externally powered/bus-powered?

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