Ancestors

Written by Manawyrm | Sarah -> FOSDEM on 2024-09-01 at 21:22

New blog post:

Executing Linux applications on a Raspberry Pi in less than 3.5s from power-up! 🚀🏎️

(and other power saving tricks)

https://kittenlabs.de/blog/2024/09/01/extreme-pi-boot-optimization/

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Toot

Written by William D. Jones on 2024-09-01 at 22:40

@manawyrm I definitely wish I knew about USB-SD-Mux a year ago... but a little pricey for me right now.

Also, in the last graph, are pin 0 and pin 1 both part of the first userspace app to run, or is pin 0 "boot is done, from kernelspace" and pin 1 is "toggle a pin from userspace"?

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Descendants

Written by Manawyrm | Sarah -> FOSDEM on 2024-09-01 at 22:45

@cr1901 the latter.

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Written by William D. Jones on 2024-09-01 at 22:46

@manawyrm How do you configure that, out of curiosity? I know you can configure LEDs to do specific things (e.g. on my TinkerBoard, the yellow LED is a "heartbeat"), but I don't know the specifics...

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Written by Manawyrm | Sarah -> FOSDEM on 2024-09-01 at 22:48

@cr1901 On the Pi, using the dtoverlay mechanism you can configure the pins however you want. In my case I‘m using the gpio-shutdown overlay, which turns a GPIO on as long as the kernel is running and then turns it off after shutdown/halt (so you can cut power)

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