rpi-open-firmware
videocoreiv
| rpi-open-firmware | videocoreiv | |
|---|---|---|
| 6 | 4 | |
| 1,117 | 806 | |
| - | - | |
| 0.0 | 0.0 | |
| about 2 years ago | about 5 years ago | |
| C | Python | |
| GNU General Public License v3.0 or later | - |
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rpi-open-firmware
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Considerations for a long-running Raspberry Pi
Comment by the developer who attempted to create open firmware, https://github.com/christinaa/rpi-open-firmware/issues/37
> a lot of corners were cut to save time leading to what I believe is poor ARMv7+ Cortex IP integration (GIC, TrustZone, etc). So I stopped working on it. If those things were not the case (GIC working, "TZPCs" working, security working as intended, instead of NS forced to high on bridge, at least in my understanding) I would still work on it ...
ARM isn't a second class citizen on this platform, it's a third class citizen since BCM2709 (again this is an opinion) ... the features I wanted to tinker with the most are absent by design (cutting corners) and I'm not willing to resort to SW emulation of them through clever uses of the VPU.
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Microsoft opens sources ThreadX RTOS used in Raspberry Pis
Sure, and it's been done: https://github.com/christinaa/rpi-open-firmware - but that doesn't involve ThreadX source, just some standard reverse engineering work. ThreadX is really the least interesting part of this whole operation in terms of the Raspberry Pi.
It's very cool that ThreadX has been open sourced as it offers an additional battle tested and mature alternative to FreeRTOS for new projects, but in terms of reverse engineering or open sourcing the Raspberry Pi VideoCore blob, it's pretty much a non-event IMO.
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LibreRPi – open source replacements for RPi firmware
I guess you are thinking of this issue:
https://github.com/christinaa/rpi-open-firmware/issues/37
Since then the project moved to a new maintainer (not me), who worked on it slowly but surely. They need new contributors though.
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Using my homemade linux laptop my 70's terminals are able to connect to the interwebs!
They have (https://github.com/christinaa/rpi-open-firmware). The problem is that almost nothing works (no video or even USB). The sequel to "f you, NVIDIA": f you, Broadcom.
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SoftBank's Sale of Arm to Nvidia Collapses, Arm to IPO
> no clue if there's a project to reimplement that
There was! And it even booted Linux in some capacity: https://github.com/christinaa/rpi-open-firmware
> every chip is very different from one another
Eh, the usual embedded SoCs are not that different from each other — ARM GIC, ARM timer, lots of Synopsys Designware crap for SDMMC/XHCI/PCIe/etc.
For many SoCs it's totally feasible to make standards-compliant firmware, e.g. for the Rockchip RK3566 there is https://github.com/jaredmcneill/quartz64_uefi
And SoCs from the networking world (Marvell, NXP) are typically supported by upstream EDK2.
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rpi-open-firmware: open-source VPU side bootloader for Raspberry Pi
from 2018: Is this project dead? KB - No not dead but on hold, see my response · Issue #37
https://github.com/christinaa/rpi-open-firmware/issues/37
videocoreiv
- Assembly coding without OS
- reversing pi 4b (arm64) firmware
- VideoCore IV Processor Manual (Raspberry Pi GPU)
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Taking a Stand in the War on General-Purpose Computing
Interesting, the VC firmware is ThreadX based, indeed[1]! The number of platforms this runs on is absolutely mind-blowing (from an engineering perspective).
[1] https://github.com/hermanhermitage/videocoreiv
What are some alternatives?
tl - The compiler for Teal, a typed dialect of Lua
rpi-open-firmware - Open source VPU side bootloader for Raspberry Pi.
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rpi4-osdev - Tutorial: Writing a "bare metal" operating system for Raspberry Pi 4
rpi-open-firmware - Open source VPU side bootloader for Raspberry Pi.
java-keyring - Copy of Java Keyring library from bitbucket.org/bpsnervepoint -- with working CI in for osx/linux/windows keystore.
quartz64_uefi - EDK2 UEFI for Rockchip RK3566 and RK3568 based SBCs.
Raspberry_Pi4-B_Assembler - How to code Bare Metal with Assembly language
firmware - This repository contains pre-compiled binaries of the current Raspberry Pi kernel and modules, userspace libraries, and bootloader/GPU firmware.
serverlessui - A command-line utility for deploying serverless applications to AWS. Complete with custom domains, deploy previews, TypeScript support, and more.
ArduinoCore-mbed