raspberry-pi-os VS broadcom-bt-firmware

Last but not the least, learning by doing is fun so you can check out - raspberry-pi-os (writing an os from scratch) - https://github.com/s-matyukevich/raspberry-pi-os

CheesecakeOS for Raspberry Pi Volume 0: Booting, Processes, and Virtual Memory is the first in what I hope is a series of github markdown tutorials or volumes on bare-metal from-scratch operating system development.

I have dreamed of contributing to the Linux Kernel, but have yet to find the courage to jump in and do so. I started by attempting to read Understanding the Linux Kernel by Daniel Bovet and Marco Cesati, but found it was too advanced for me at the time. I found another text I credit with advancing my understanding, Computer Systems: A Programmer's Perspective by Randall Bryant and David O'Hallaron. I worked on the self-study labs from their book website, and found them to be a superb educational tool.

Further, then becoming interested in what creating an operating system actually means, I stumbled upon Sergey Matyukevich's Rasberry-Pi-OS github repo (https://github.com/s-matyukevich/raspberry-pi-os). I wanted to expand on his tutorial, for my own education, and, in the best case, for the benefit of others.

There are many ideas taken from Linux in the implementation, as when I didn't know how to proceed, that is the source I would consult. Though, I attempt to simplify and explain the details in the text. The implementation stops short of implementing or supporting a file system, the subject of the next volume.

Not familiar with this myself but aiming to start soon. Have found a nice youtube series for low level development on the RPi, not sure which version he uses, but reportedly it works for some on RPi 4. He also has a subreddit:

Here's one tutorial: https://github.com/s-matyukevich/raspberry-pi-os

C: Learning operating system development using Linux kernel and Raspberry Pi

downlaoded bluetooth dongle fw from this repo https://github.com/winterheart/broadcom-bt-firmware

Ended up finding this Github for Broadcom Firmware for Linux. Installed the AUR copy of the firmware (broadcom-bt-firmware) and it has certainly helped the quality of my bluetooth.

and it's "blob" and "raw" https://github.com/winterheart/broadcom-bt-firmware/blob/master/brcm/BCM43142A0-0a5c-21d7.hcd this is the direct link, just verify the name "BCM43---" thing.

which is a wireless/bluetooth combo thing, so I came across this repository: https://github.com/winterheart/broadcom-bt-firmware, found the corresponding HCD file and put it into /lib/firmware/brcm, which sadly fixed nothing. Thankfully wired still works fine. What else can I do to fix this?

If this matches what you are seeing, you may see a couple error lines in your Logs on startup similar to shown. A solution I have found involves manually applying the broadcom-bt-firmware patches to your system from the git repository. As with anything like this, make sure you have the broadcom BT in your system, you are seeing a similar error in the log files, an up to date timesync backup of your install and access to a boot USB with Vanessa installed in case something goes wrong.

While looking for fixes for my issue i stumbled on this which may be of help to you https://github.com/winterheart/broadcom-bt-firmware.

Step 1 -> Download This File To Your Desktop (Converted Official Package, Do Not Change File Name)

Compiling the firmware is recommended in the German forums ubuntuusers.de. https://github.com/winterheart/broadcom-bt-firmware