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by jdb
Fri Oct 18, 2019 2:10 pm
Forum: General discussion
Topic: Disable USB-3 to improve the wifi range.
Replies: 15
Views: 563

Re: Disable USB-3 to improve the wifi range.

But, Is it posssible to made VIA chip to work only on USB-2 mode? No. I have discovered a weird behaviour from usb-3 and wifi 2.4 on rpi-4. {...} Seems that is better to use the bottom usb-3 port to avoid RF interference. Definitely, yes the bottom usb-3 port is better to avoid RF on 2.4 band.I don...
by jdb
Wed Oct 16, 2019 8:07 pm
Forum: General discussion
Topic: Dmesg questions
Replies: 2
Views: 143

Re: Dmesg questions

It's mostly-meaningless spam from the dwc_otg USB driver as it loads. The driver is built-in to the kernel so it is always loaded, and likes to announce its presence with multiple log lines. It serves no purpose on Pi4 as the USB ports are serviced via a PCI-express controller chip.
by jdb
Wed Oct 16, 2019 2:53 pm
Forum: General discussion
Topic: Unable to display 2 feeds from two USB cams on PI 4
Replies: 7
Views: 149

Re: Unable to display 2 feeds from two USB cams on PI 4

You haven't posted the information that I have asked for. Please do so. Setting gpu_mem has absolutely no impact on a yuy2 output stream, unless you set it to an unsupported (large) value - in which case your system won't boot (so you don't get a stream at all). - Why did you change the gpu_mem conf...
by jdb
Wed Oct 16, 2019 1:50 pm
Forum: General discussion
Topic: Unable to display 2 feeds from two USB cams on PI 4
Replies: 7
Views: 149

Re: Unable to display 2 feeds from two USB cams on PI 4

What "logitech USB cameras" are these?

Please post a full lsusb -v and dmesg listing.
by jdb
Fri Oct 11, 2019 2:35 pm
Forum: Troubleshooting
Topic: Raspberrypi 4 booting but no usb
Replies: 10
Views: 340

Re: Raspberrypi 4 booting but no usb

If you plug in a wired optical mouse, is there any activity from its LED? Most mice will turn on the LED if powered, independently of whether the USB connection is working or not.
by jdb
Fri Oct 11, 2019 8:38 am
Forum: Troubleshooting
Topic: Raspberrypi 4 booting but no usb
Replies: 10
Views: 340

Re: Raspberrypi 4 booting but no usb

I just tried that and It told me I have to login and I couldn't because I don't have power to my keyboard so I couldn't type and I used keyboards and mice that were well below the 500mA limit that I saw on the RaspberryPi website and have tried them on a PC and 2 different laptops Why do you think ...
by jdb
Sat Oct 05, 2019 5:54 pm
Forum: General discussion
Topic: Raspberry Pi 4 B+
Replies: 3
Views: 257

Re: Raspberry Pi 4 B+

NIUPY wrote:
Sat Oct 05, 2019 12:23 pm
:?: When will launch the 4 raspberry Pi model b+
Tuesday.

Also, locking.
by jdb
Sat Sep 28, 2019 4:38 pm
Forum: General discussion
Topic: Update for Rpi Zero W?
Replies: 74
Views: 2275

Re: Update for Rpi Zero W?

The Ethernet connector on a Pi4B is *not* shared with the USB ports. That's one of the nice upgrades. Since it is a separate port on the SoC, it raises the possibility to have wired Ethernet on an A-series Pi. Possible, but it would still need the PHY chip and the magjack socket. Correct, which is ...
by jdb
Wed Sep 25, 2019 9:24 pm
Forum: General discussion
Topic: RPI4: Why is everything still 32-bit?
Replies: 180
Views: 6714

Re: RPI4: Why is everything still 32-bit?

So, would it have been better to just delete your post? IMO as a moderator you shouldn't ask the "mob", and that's what you're doing here, if a post should be deleted. You might refer to forum rules combined with your sort of common sense (I'm quite sure it will differ from mine - which is complete...
by jdb
Wed Sep 25, 2019 11:27 am
Forum: General discussion
Topic: Pi4 as Desktop computer
Replies: 245
Views: 21410

Re: Pi4 as Desktop computer

[Citation needed]. Which SOCs are these? It was mentioned here in the forums somwhere that 2 GHz is the limit for the A72 at 28 nm. And the Pi 4 reaches this just not 100% stable because of the power issue which was mentioned above by your colleague. A vague reference to "other random post on the f...
by jdb
Wed Sep 25, 2019 10:34 am
Forum: General discussion
Topic: Pi4 as Desktop computer
Replies: 245
Views: 21410

Re: Pi4 as Desktop computer

pica200 wrote:
Wed Sep 25, 2019 10:20 am

Every other A72 based SoC with the same process node is able to reach 2 GHz and this one would too if it were not for the weak PMIC.
[Citation needed]. Which SOCs are these?
by jdb
Mon Sep 23, 2019 12:58 pm
Forum: General discussion
Topic: RPI4: Why is everything still 32-bit?
Replies: 180
Views: 6714

Re: RPI4: Why is everything still 32-bit?

With a 32 bits bus to the RAM you will be bottlenecked even with cache in RAM heavy applications because you will request data from the cache faster than it can fetch from DRAM (cache misses). There is a good reason many other SBCs and smartphones have a dual channel configuration with big caches. ...
by jdb
Mon Sep 23, 2019 12:50 pm
Forum: General discussion
Topic: Pi4 as Desktop computer
Replies: 245
Views: 21410

Re: Pi4 as Desktop computer

The door was slammed and the house set fire to. The flames are licking at your tinkering feet as we speak. Here's a tip: Don't try to attract those of us with more of a life than spending our days CLI-ing and generally computing like it's Ubuntu 2008. You are re-inventing the wheel. All this nonsen...
by jdb
Mon Sep 23, 2019 11:58 am
Forum: General discussion
Topic: RPI4: Why is everything still 32-bit?
Replies: 180
Views: 6714

Re: RPI4: Why is everything still 32-bit?

It makes no sense to talk of "true" 64 bits or true 32 bits now a days. Modern processors don't connect so directly to memory, they can fetch 32, 64, 128 instruction bits from huge caches. Which in turn get their data from memory controllers that stream blocks of memory into the system from the ext...
by jdb
Mon Sep 23, 2019 8:44 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 558
Views: 164647

Re: Raspberry Pi 4 temperature

I've tried to update the firmware on my Pi 4 from within Raspbian via PhilE's instructions on Page 4. However, I continually received the error ""failed to open 'vl805_fw_0137a8.bin'" when running the command "sudo ./vl805 -w vl805_fw_0137a8.bin" Instead, it accepted the command "sudo ./vl805 -w vl...
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: 9
Views: 415

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: 470

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: 67
Views: 8803

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: 9
Views: 415

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: 521

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: 206

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: 558
Views: 164647

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: 67
Views: 8803

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: 3
Views: 366

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.

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