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by ejolson
Mon Jul 08, 2019 4:36 pm
Forum: General discussion
Topic: Heatsinks official for rpi 4 ?
Replies: 43
Views: 3096

Re: Heatsinks official for rpi 4 ?

The calculation which illustrated the difficulties with 3V power on the Pi 3B most dramatically, in my opinion, was the high-performance Linpack available here . The reported speed of the 4B is about 10.9 Gflops using the power-over-Ethernet hat as the cooling solution. While that number seems reas...
by ejolson
Mon Jul 08, 2019 4:20 pm
Forum: General discussion
Topic: Pi4 kit, where to buy in London?
Replies: 6
Views: 330

Re: Pi4 kit, where to buy in London?

When visiting London, I hoped to pick up a Pi4 kit. When asking at Selfridge the pore man sent me to the fooddepartment after asking at the electronica departement for a Raspberry Pi... 😅 Amy help where to go to in London? Thanks! In London it would be Sainsbury's, Waitrose or Tesco, otherwise to t...
by ejolson
Mon Jul 08, 2019 3:34 pm
Forum: Off topic discussion
Topic: RIP 32 BIT
Replies: 223
Views: 6323

Re: RIP 32 BIT

DavidS, Unfortunately the Cortex-M MCU's are not quite what you would expect. Many of them are thumb only... Yes. I always thought the ARM architecture was a mess. If you look at the list at Digikey there are actually a good number of MCU;s that use the full ARM AARCH32 ISA, those are the ones you ...
by ejolson
Mon Jul 08, 2019 3:16 pm
Forum: General discussion
Topic: Heatsinks official for rpi 4 ?
Replies: 43
Views: 3096

Re: Heatsinks official for rpi 4 ?

I suspect if you modified cpuburn to check things it might not run so hot. Strangely enough I'm trying to sell licenses for a patent that uses the theory of deterministic chaos in nonlinear dynamical systems to get around the difficulty that checking the answer ruins the stress test. I think a none...
by ejolson
Mon Jul 08, 2019 1:52 pm
Forum: General discussion
Topic: Heatsinks official for rpi 4 ?
Replies: 43
Views: 3096

Re: Heatsinks official for rpi 4 ?

I use this heat sink from the PiHut which is bigger, heavier, and has decent 3M thermal tape pre-applied. https://thepihut.com/products/al-heat-sink-with-adhesive-tape-30-30-10mm There is no fan, they are simply not needed for the Pi4 (unless you stick it in a small plastic case). My Pi4 is overclo...
by ejolson
Mon Jul 08, 2019 1:36 pm
Forum: Off topic discussion
Topic: RIP 32 BIT
Replies: 223
Views: 6323

Re: RIP 32 BIT

So, how to disable all this crap? For the Pi3 ....... Perhaps change the frequency scaling governor from "on-demand" to "performance" (or some such). There are some further hints how to do this here . On Intel machines I sometimes set minimum clock speed equal to the maximum clock speed as well, ho...
by ejolson
Mon Jul 08, 2019 1:21 pm
Forum: Off topic discussion
Topic: The Great Raspberry Pi Computers.
Replies: 105
Views: 3479

Re: The Great Raspberry Pi Computers.

I would never ask for any features added to a Raspberry Pi, as they are already great. Things that would be nice to see as it has been mentioned in this thread are: Remove WiFi from those models that have it. Remove Bluetooth from those models that have it. You're going to be shocked, but I'm in fa...
by ejolson
Sun Jul 07, 2019 11:05 pm
Forum: Off topic discussion
Topic: Custom RPi board from scratch
Replies: 5
Views: 456

Re: Custom RPi board from scratch

Hey guys, I am not sure where to put this post so I thought it might go here. I am trying to building my own RPi from scratch. Like I want to get all the components, such as the peripherals and arm processor and make my own custom board. I need to have additional peripherals and need a custom board...
by ejolson
Sun Jul 07, 2019 10:42 pm
Forum: Off topic discussion
Topic: RIP 32 BIT
Replies: 223
Views: 6323

Re: RIP 32 BIT

I strongly suspect it was not reflashing the SD card with Buster that fried that Pi and/or it's WiFi chip. The damn thing was working 10 minutes before with the same SD card with Pi64 on it. I changed the power adapter and USB cable for the next Pi 3 attempt after noticing it seemed to be having in...
by ejolson
Sun Jul 07, 2019 8:49 pm
Forum: Off topic discussion
Topic: RIP 32 BIT
Replies: 223
Views: 6323

Re: RIP 32 BIT

After I downgraded a Pi 3 (not +) from Pi 64 to the new Raspbian Buster it refused to boot. Then I noticed the WiFi chip was getting extremely hot. After messing with a bit I think I have to conclude it's dead. Given the rate at which they're breaking, instead of a Pi 4B it may be advisable to purc...
by ejolson
Sun Jul 07, 2019 8:30 pm
Forum: General programming discussion
Topic: GUI Editor Code Challenge
Replies: 174
Views: 2944

Re: GUI Editor Code Challenge

DavidS, What you describe used to be a standard early programming challenge for programmers learning a new GUI Window System. Often times compilers would come with examples of how to do just this. Ah those were the days... My C compilers for the Atari ST came with ready made GUI examples. Then ther...
by ejolson
Sun Jul 07, 2019 7:50 pm
Forum: General discussion
Topic: Pi 4 firmware, software stability improvements
Replies: 62
Views: 6159

Re: Pi 4 firmware, software stability improvements

cruster wrote:
Sun Jul 07, 2019 6:28 pm
Image
Nice pictures. What kind of power supply are you using?
by ejolson
Sun Jul 07, 2019 1:09 am
Forum: General discussion
Topic: Dead port.
Replies: 1
Views: 123

Re: Dead port.

Hi there. I'm not sure if this is the right spot to post this. But my raspberry pi zero w data port just died on me. I had a keyboard and mouse combo connected to it and it was working fine then it stopped working.. Any ideas Thanks Is it possible you switched the power and data ports by mistake?
by ejolson
Sat Jul 06, 2019 2:55 pm
Forum: General discussion
Topic: Pi 4 - full specification of VideoCore 6
Replies: 20
Views: 2439

Re: Pi 4 - full specification of VideoCore 6

It's clearly designed for operating on 8bit color, I'm not sure how useful they will be for machine learning. Isn't that usually done with 8bit floats? Why thank you for your lovely expose! And, yes, people use byte sized ints for ML, and even nibbles! https://devblogs.nvidia.com/nvidia-turing-arch...
by ejolson
Sat Jul 06, 2019 2:32 pm
Forum: Off topic discussion
Topic: RIP 32 BIT
Replies: 223
Views: 6323

Re: RIP 32 BIT

There is currently a program called cpuburn-53 available here . This does a pretty good job testing thermal management solutions for the Pi 4B, but it is tuned for the Cortex-A53 rather than the A72. The challenge would be to create a similar program (or find one if it already exists) that generate...
by ejolson
Sat Jul 06, 2019 1:42 pm
Forum: Off topic discussion
Topic: RIP 32 BIT
Replies: 223
Views: 6323

Re: RIP 32 BIT

I like the Raspberry Pi. I like the Raspberry Pi in every version I have had the chance to use. I am thankful that the Raspberry Pi 4B still supports AARCH32, as that is the ISA I prefer. I am not going to tell anyone what to use. though this thread is about the merits of 32-bit versus 64-bit on AR...
by ejolson
Sat Jul 06, 2019 1:06 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 705
Views: 59967

Re: Raspberry Pi 4 Thread - general discussion

If they sort out the heating err. better cooling performance or go for a nice built on heatsink setup. And the broadcom SoC could take it, then how about a nice 2.4GHz Pi4 Faster clock speed seems like the wrong idea for heat management. How hot does the Pi 4B get if you restrict the maximum clock ...
by ejolson
Sat Jul 06, 2019 3:52 am
Forum: Off topic discussion
Topic: RIP 32 BIT
Replies: 223
Views: 6323

Re: RIP 32 BIT

It may need tweaking as a benchmark, it's so quick to run on a Pi or PC I'm not sure the results make any sense. It tried it on a down clocked Pi Zero first ... I think it is a useful benchmark even though it runs quickly as you say. It said -1 us I think thats because the printf uses %d to print a...
by ejolson
Fri Jul 05, 2019 6:46 pm
Forum: Off topic discussion
Topic: RIP 32 BIT
Replies: 223
Views: 6323

Re: RIP 32 BIT

The ARM came about because the Acorn guys visited the US and saw some people designing a RISC chip In a fictional sort of way, the first CISC architectures were designed to make it easy for people to write assembly language programs. After observing that people preferred to code using high-level la...
by ejolson
Fri Jul 05, 2019 4:44 pm
Forum: Off topic discussion
Topic: RIP 32 BIT
Replies: 223
Views: 6323

Re: RIP 32 BIT

<parody> Did you know... AMD's 64 bit extensions to the Intel x86 architecture dropped the AAA instruction? What were they thinking? The AAA instruction has been with us since the 8080 (As DAA). The Z80 had similar. Don't they know that us guys hand crafting decimal arithmetic in 2K bytes of RAM sp...
by ejolson
Fri Jul 05, 2019 2:22 pm
Forum: Off topic discussion
Topic: RIP 32 BIT
Replies: 223
Views: 6323

Re: RIP 32 BIT

ejolson, I'm not sure why people are so interested in running databases and web browsers in 64-bit mode. You know that Pi cluster you have, what is that about? That Pi Zero cluster seems to be classified as educational outreach. As you mention, quite a lot of people use Pi computers to experiment w...
by ejolson
Fri Jul 05, 2019 2:00 pm
Forum: Off topic discussion
Topic: RIP 32 BIT
Replies: 223
Views: 6323

Re: RIP 32 BIT

For Youtube I go over to RISC OS, where the page loads instantly in !NetSurf, the video streams smoothly through a patched version of !FFPLayer after getting the video url with !Murnong, with a total memory usage of less than 50MB and averaging less than 50% of the time of a single CPU core (withou...
by ejolson
Fri Jul 05, 2019 1:13 pm
Forum: Off topic discussion
Topic: RIP 32 BIT
Replies: 223
Views: 6323

Re: RIP 32 BIT

The user guide that comes with the Pi4 has mention of a 8GB version. Good luck using that in 32bit mode ;) On ARM's web pages there is somewhere something about the Aarch64 being more energy efficient than Aarch32. That means lower heat to me and or lower current. I have no idea how to use 1GB in m...
by ejolson
Fri Jul 05, 2019 4:04 am
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 107
Views: 10238

Re: Raspberry Pi 4 usb boot?

No one normally has SD cards laying around the house, but I'd like to bet anyone that there would be a few flash drives in most houses on the planet. Around here spare flash drives, that is SSDs, are much less common than SD cards. It's worth noting that the initial program load on all modern PC mo...
by ejolson
Fri Jul 05, 2019 2:32 am
Forum: Off topic discussion
Topic: Why did positive thread get deleted?
Replies: 26
Views: 1428

Re: Why did positive thread get deleted?

HawaiianPi wrote:
Fri Jul 05, 2019 1:59 am
Could be Off-Topic Pi discussion, Miscellaneous, or... :?:
Maybe it could be renamed as "Off-topic Pi Topics." Speaking of which, has anyone made a fireworks celebration simulator for the Raspberry Pi? Could it be done in Scratch or would that orange cat get in the way?

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