Quick question about boot order with an RPi and Duet 3
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I meant that which output is used doesn't matter with respect to the behavior when the board is reset. There are indeed other considerations to make.
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Have not tried this myself, but there are examples of people getting the Pi to boot in ~5 seconds with some modifications.
http://himeshp.blogspot.com/2018/08/fast-boot-with-raspberry-pi.html
Note that was with Pi3 a couple years ago now. Not sure how relevant it would be to Pi4.
The pi forums have many threads on trying to optimize boot time. https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=258091
Normal SD card boot times are all pretty close to 25 seconds on the pi4 from what I've seen. Moving to an SSD may improve that a bit but I don't think that's a natively supported option yet.
https://www.youtube.com/watch?v=gp6XW-fGVjo
If sticking with an SD card, try and choose one with high write speeds and high IOPs. A2 U3 class.
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I just looked into the boot process again and I've found a way to prioritise DSF. This way, DCS will start within 10 seconds when the Pi is powered on.
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On the subject or wiring the fans as being always on, looking at the wiring diagram https://d17kynu4zpq5hy.cloudfront.net/igi/duet3d/6mYpDS1EmhXHobw4.huge it looks like I could simply connect the fans to OUT3 (or 4 or 5) GND and V_OUTLC1.
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@deckingman said in Quick question about boot order with an RPi and Duet 3:
On the subject or wiring the fans as being always on, looking at the wiring diagram https://d17kynu4zpq5hy.cloudfront.net/igi/duet3d/6mYpDS1EmhXHobw4.huge it looks like I could simply connect the fans to OUT3 (or 4 or 5) GND and V_OUTLC1.
I may have missed this before but why not use the always-on fan header right above out_0?
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@deckingman said in Quick question about boot order with an RPi and Duet 3:
V_OUTLC1.
if you remove the jumper that pin has no voltage, use 12v on same header instead.
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@gtj0 said in Quick question about boot order with an RPi and Duet 3:
I may have missed this before but why not use the always-on fan header right above out_0?
methinks he has 24v Vin and 12v fans.
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@bearer said in Quick question about boot order with an RPi and Duet 3:
@deckingman said in Quick question about boot order with an RPi and Duet 3:
V_OUTLC1.
if you remove the jumper that pin has no voltage, use 12v on same header instead.
???? There is no 12V on that header - but I'm not going to remove the jumper - I'll set it to 12V.
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@bearer said in Quick question about boot order with an RPi and Duet 3:
@gtj0 said in Quick question about boot order with an RPi and Duet 3:
I may have missed this before but why not use the always-on fan header right above out_0?
methinks he has 24v Vin and 12v fans.
Correct.
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@deckingman said in Quick question about boot order with an RPi and Duet 3:
???? There is no 12V on that header - but I'm not going to remove the jumper - I'll set it to 12V.
never mind, i thought you meant to use the pin on the voltage selection header, but that doesn't make sense.
you're good to go as planned
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@bearer said in Quick question about boot order with an RPi and Duet 3:
@deckingman said in Quick question about boot order with an RPi and Duet 3:
???? There is no 12V on that header - but I'm not going to remove the jumper - I'll set it to 12V.
never mind, i thought you meant to use the pin on the voltage selection header, but that doesn't make sense.
you're good to go as planned
You had me worried there - at my age, senile dementia is just around the corner so....
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@deckingman said in Quick question about boot order with an RPi and Duet 3:
You had me worried there - at my age, senile dementia is just around the corner so....
seems i'm the one ought be worried
