LibreRPi – open source replacements for RPi firmware

Re:LibreRPi – open source replacements for RPi firmware by actionfromafar on Thursday September 15, 2022 @09:10AM (#32851345)

This project focuses on being a drop in replacement to the proprietary firmware needed to bringup Linux on the other processor. (The ARM processor.)

Isn't anyone going to talk about running random stuff on the VPU itself?! Given it's the thing used for 3D and stuff, I imagine it's going to be crazy fast at certain computations, much faster than the ARM is.

Untapped potential of all Raspberry Pies out there... maybe the VPU can be (ab)used to do stuff similar to what the Raspberry Pico can do.

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Re:LibreRPi – open source replacements for RPi firmware by cleverca22 on Thursday September 15, 2022 @09:38AM (#32851749)

yep, thats why ive been focusing a lot on porting linux drivers over to little-kernel on the vpu, and getting things working without linux

https://www.youtube.com/watch?v=l7lIewA9fm4 is an example of a VPU accelerated mandelbrot, without the arm core even being turned on

for (int i=0; i<16; i++) { int temp = a[i] * b[i]; if (store) c[i] = temp; if (accumulate) accumulator[i] += temp; }

basically, the VPU can run this entire line of code in just 2 clock cycles, and this isnt even the 3d core, which is entirely seperate and more complex

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