On 10/30/19 10:47 PM, Gene Heskett wrote:
On Wednesday 30 October 2019 16:26:08 andy pugh wrote:
Apparently the Pi4 overheating is the USB, not the CPU, and there is a
fix...
https://hackaday.com/2019/10/30/rpi4-now-overclocked-net-booted-and-po
wer-sipping/
I did the upgrade and now I can "sudo reboot" it from here in the house.
I couldn't before, taking a full shutdown and power cycle. Thats a
definite improvement. FWIW, I gave a slow fan from an old video card, a
12 volt fan running of 5 volts, and 4 heat sinks of the stickon variety,
including what I think is the usb chip right behind those connectors.
I've not had any heating problems that I am aware of since mount it chip
side toward the fan, upside down so there no twist in the spi cable to a
right side up 7i90HD, and the cable is only an inch long. Latency is by
itslf, a red hair under 15 u-secs. Start a session of glxgears an its
about 49 u-secs, but due to the slow network just under 3 fps if pulled
out to nearly full screen. From its own screen, full screen was 59 fps.
I can live with that :) But my keyboard just died, new battery's didn't
fix it, but after new battery's a shut off and a turn back on of the
port of the usb hub the dongle is plugged into revived it. Must be
getting close to Halloween. :)
Cheers, Gene Heskett
In earlier posts you referenced
"
Got it by brute force, stuff moved to new location, at link in sig below,
add "lathe-stf/linuxcnc4rpi4" should get you a list, en, fr and es docs
and all the other stuff output by debuild. Many thanks to John Thornton
for his build recipe.
I tried to track this down and was unable to find. Has it moved or is it OBE.
I just got my RPi 4's and would like to try building LinuxCNC on them. Any
pointers
on where to start would be appreciated.
Thanks, Hubert Bahr
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