Go to advanced search

by rpdom
Sun Sep 08, 2019 7:36 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 304
Views: 48048

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". I'm trying to make a chain loader. It will be called slug. Do you have any idea how to make kexec work on the Raspberry Pi? How does NOOBS do it? NOOBS doesn't use kexec. It use...
by rpdom
Sun Sep 08, 2019 3:11 pm
Forum: Other projects
Topic: Beginner Raspberry Pi Dramble hardware question
Replies: 3
Views: 135

Re: Beginner Raspberry Pi Dramble hardware question

I haven't been through the full list of switches you gave, but that cheap one doesn't appear to have PoE which would explain why it is so cheap. Of course, if you use power supplies to run the Pi cluster instead of PoE HATs or adaptors you don't need a PoE switch. Also, looking at the prices given f...
by rpdom
Sun Sep 08, 2019 10:09 am
Forum: Troubleshooting
Topic: RPi 2 headless ssh doesn´t work
Replies: 9
Views: 169

Re: RPi 2 headless ssh doesn´t work

Due to the initial setup the Pi won't respond to an SSH connection for a few minutes (depending on card size and Pi model) after booting.

The fact the file did vanish is a good sign that the Pi has booted from the card and has started the setup, but does not prove it finished correctly.
by rpdom
Sun Sep 08, 2019 9:30 am
Forum: Off topic discussion
Topic: Raspberry Pi Zero W Revision
Replies: 7
Views: 558

Re: Raspberry Pi Zero W Revision

OK my reply was a bit harsh, but it has been asked and regurgitated many times. Not quite sure why you are quoting me and W. H. Heydt in your reply. We didn't criticise your response at all. Bottom line is research, research, research then post a costing of BoM..... Indeed. Also take into considera...
by rpdom
Sun Sep 08, 2019 9:22 am
Forum: Beginners
Topic: how to unmount a SD card with 2 partitions completely in a USB card reader (in order to unplug it safely)?
Replies: 10
Views: 162

Re: how to unmount a SD card with 2 partitions completely in a USB card reader (in order to unplug it safely)?

What format are the partitions in?

If they are not one of the very few that Windows recognises it will scream and say they need formatting which is a lie.
by rpdom
Sun Sep 08, 2019 7:04 am
Forum: Networking and servers
Topic: Reverse Remote Ssh Tunnel
Replies: 12
Views: 269

Re: Reverse Remote Ssh Tunnel

All this SSH tunnelling seems like a difficult way of doing things to me, but possibly the way I do things could seem tricky to set up too. However, once set up it "just works". I have a couple of VPSs. I have installed tinc (A mesh VPN) on both of them. I have the same software on a Pi at home. The...
by rpdom
Sun Sep 08, 2019 6:44 am
Forum: Off topic discussion
Topic: Raspberry Pi Zero W Revision
Replies: 7
Views: 558

Re: Raspberry Pi Zero W Revision

In before the lock... The problem with the requested upgrades is the same one that has existed since launch. Where are you going to find an SoC with the desired characteristics that can take PoP RAM and at an acceptable cost to maintain the retail price? The SoC is the main issue there. Having the ...
by rpdom
Sat Sep 07, 2019 1:26 pm
Forum: General discussion
Topic: Dual redundancy raspberry PI
Replies: 14
Views: 619

Re: Dual redundancy raspberry PI

I would actually go for a master-slave system using MariaDB and throw a heartbeat either via SQL or MQTT with the slave having the ability to power the master down. A lot simpler than trying to get fancy as you are using the native database function to replicate the data. Another system I used rece...
by rpdom
Sat Sep 07, 2019 11:48 am
Forum: Raspbian
Topic: Raspbian Stretch for Pi 4
Replies: 8
Views: 319

Re: Raspbian Stretch for Pi 4

Stretch will not work on a Pi 4 without a fair of hacking around.
by rpdom
Sat Sep 07, 2019 11:45 am
Forum: Raspberry Pi Desktop for PC and Mac
Topic: RPDesktop on Buster ?
Replies: 18
Views: 1990

Re: RPDesktop on Buster ?

HawaiianPi wrote:
Sat Sep 07, 2019 10:28 am
ShiftPlusOne wrote:
Fri Apr 19, 2019 5:07 pm
The official answer would be that it's x86 only and there are not plans for an amd64 release.
The percentage of users with x86-32 machines must be astronomically low by now.
I've got several, although I'll admit I only use one on a regular basis and that is running an old Debian system.
by rpdom
Sat Sep 07, 2019 11:37 am
Forum: General discussion
Topic: Dual redundancy raspberry PI
Replies: 14
Views: 619

Re: Dual redundancy raspberry PI

A heartbeat is one way that High Availability systems can work. You have one Live server and one Standby server. The data from the Live server is replicated to the Standby one. The Live one also sends a message to the Standby one every so many seconds with a datestamp to show that it is alive. If th...
by rpdom
Sat Sep 07, 2019 6:08 am
Forum: General discussion
Topic: black friday/ cyber monday deals for the PI
Replies: 13
Views: 590

Re: black friday/ cyber monday deals for the PI

One of the ideas behind the Pi is that it should be affordable. To that end Eben stated that the standard model will always cost $35. That he and his team have been able to continue doing that while raising the specifications of the unit by an absurd amount is just incredible. Yet some people still ...
by rpdom
Sat Sep 07, 2019 6:02 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 529
Views: 130715

Re: Raspberry Pi 4 temperature

True. But it also gives irrelevant data when it does throttle. ie if you insist on no throttling when running CPUBurn you almost certainly WILL need extra cooling, whereas you can quite happily run a Pi4 without any extra cooling. So in that case it possibly making you buy more kit (heatsink, fan) ...
by rpdom
Sat Sep 07, 2019 5:53 am
Forum: Automation, sensing and robotics
Topic: Longer cable for GPIO-sensor?
Replies: 10
Views: 485

Re: Longer cable for GPIO-sensor?

Floppy/Pata cables are used to transmit signals at 133Mhz or less. The GPIO pins mainly just transmit voltages (on-off at slow speeds), with very few pins actually used for data. Well, 33MHz for the 40 pin cables and the floppy cables were much slower and very few of the pins were actually used for...
by rpdom
Sat Sep 07, 2019 5:42 am
Forum: General programming discussion
Topic: Sorting files by date & outputting to list
Replies: 6
Views: 460

Re: Sorting files by date & outputting to list

I think this will do what you want in the Bash command line or a script. find /media/usbcctv/camera1/ -iname '*.mp4' -type f -size +1M -newermt 20190830T0000 ! -newermt 20190830T2359 -printf "%T@ file '[%p]'\n" | sort -n | cut -d' ' -f2- > list.txt That lists the file details in the format you asked...
by rpdom
Fri Sep 06, 2019 6:02 pm
Forum: Advanced users
Topic: What to use to cool Raspberry Pi 4 + POE Hat?
Replies: 6
Views: 226

Re: What to use to cool Raspberry Pi 4 + POE Hat?

The microSD / USB3 Memory Stick will definitely wear out faster than that, and the fan will definitely stop working before then. I just believe that the less heat, the better for the unit. I guess I will find out. Yes, but they are not part of the Pi. The same would be true if using them on a PC (t...
by rpdom
Fri Sep 06, 2019 5:39 pm
Forum: Advanced users
Topic: What to use to cool Raspberry Pi 4 + POE Hat?
Replies: 6
Views: 226

Re: What to use to cool Raspberry Pi 4 + POE Hat?

Well my temps are between 60 and 65C, so no, I do not *need* one - the fan in the PoE hat keeps it cool enough. However I can feel the whole unit being very warm, so I'd like to overcool it. It will extend the lifetime of the unit. I did apply the firmware update for USB3 power consumption. How lon...
by rpdom
Fri Sep 06, 2019 5:32 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 861
Views: 87469

Re: Raspberry Pi 4 Thread - general discussion

I don't push my 4B 4GB hard, but it doesn't get that hot.

Just as a precaution I have made a small aluminium heatsink with thermal paste. It is held in place with a bit of glue around the outside of the heatsink.
by rpdom
Fri Sep 06, 2019 2:26 pm
Forum: Troubleshooting
Topic: RPI4B doesn't see 5Ghz 802.11n or ac network
Replies: 8
Views: 224

Re: RPI4B doesn't see 5Ghz 802.11n or ac network

https://notenoughtech.com/raspberry-pi/2019-raspberry-pi-network-speed-test/ "The latest and greatest! The board comes with a 1Gbit adapter and it’s capable of serving 2.4 GHz and 5 GHz 802.11b/g/n/ac wireless LAN networks. The WiFi shares the bus with USB 2.0 so I’m expecting some serious bottlene...
by rpdom
Fri Sep 06, 2019 11:43 am
Forum: Troubleshooting
Topic: HDMI screen not detected at 1st start, only when rebooted
Replies: 4
Views: 102

Re: HDMI screen not detected at 1st start, only when rebooted

I just wonder where do you get all these information ? Some of it is from reading these forums for the last 7 years or so. Some of it is in the documentation part of the main website. This particular trick is something I picked up quite early on as my first Pi has never been able to read the edid d...
by rpdom
Fri Sep 06, 2019 9:01 am
Forum: Troubleshooting
Topic: HDMI screen not detected at 1st start, only when rebooted
Replies: 4
Views: 102

Re: HDMI screen not detected at 1st start, only when rebooted

It is recommended that you switch the screen on before powering up the Pi. However there is a way of grabbing the information from the screen once it has been recognised and telling the Pi to use that information (I think there may be issues with this on a Pi 4, I'm not sure). pi@raspberrypi:~ $ sud...
by rpdom
Fri Sep 06, 2019 4:54 am
Forum: Automation, sensing and robotics
Topic: Longer cable for GPIO-sensor?
Replies: 10
Views: 485

Re: Longer cable for GPIO-sensor?

ProDigit wrote:
Fri Sep 06, 2019 12:03 am
You haven't read the link I sent, and haven't pressed the amazon link either.
You're making assumptions.
They're still commonly sold on Amazon and Ebay for just $10.
Ouch! That's a lot for an old junk cable. I've got a stack of them I havn't used for years.
by rpdom
Thu Sep 05, 2019 10:41 pm
Forum: Automation, sensing and robotics
Topic: Longer cable for GPIO-sensor?
Replies: 10
Views: 485

Re: Longer cable for GPIO-sensor?

A 34 pin floppy cable like this one below would most likely fit. (24" ~ 60cm) Why would that be any better than using ordinary jumper wires? The wires would be thinner if anything. I wished the Pi foundation was able to re-rout the pins via software, to allow compatibility with floppy cables (since...
by rpdom
Thu Sep 05, 2019 6:42 pm
Forum: Advanced users
Topic: Pi4 64-bit raspbian kernel for testing - Focus on Pi4
Replies: 96
Views: 8364

Re: Pi4 64-bit raspbian kernel for testing - Focus on Pi4

Since Raspbian is being converted to 64-bit (woohoo!!) does that mean Raspbian Desktop for PCs will become 64-bit as well? The Raspberry Pi Desktop for PCs already uses a 64-bit kernel. It just uses 32-bit userland code, exactly the same as Raspbian will with the new kernel. We'll have to wait for ...
by rpdom
Thu Sep 05, 2019 10:12 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Any settings to hold pi from booting with a GPIO pin?
Replies: 1
Views: 71

Re: Any settings to hold pi from booting with a GPIO pin?

There is the RUN header on the Pi Zero. Connecting the RUN pin 1 to 0V will hold the Pi in a Halt state until it is released. That won't stop the Pi using some power, but it will stop it from running and reduce the power a bit.

Go to advanced search