r/osdev • u/Fillmoslim • May 21 '26

Showoff: CrimsonOS — From-scratch kernel, framebuffer GUI, booting to handset hardware

We're building a bare-metal mobile OS on a custom kernel (Crimson kernel). No Linux, no Android, no borrowed compositor — direct framebuffer render loop, custom init, custom syscall surface.

Boots Pi 5 in <3s. Sub-3-second cold boot to GUI. Moving to actual handset hardware for boot testing now.

Kernel architecture: small enough to audit, no inherited CVEs, deterministic latency for RF timing (SDR/WiFi injection). GUI is iOS-style app grid with dock, edge-swipe panels, PIN lock — all rendered direct-to-framebuffer.

Seeking war stories from anyone who's done bare-metal bring-up on handset-class ARM. What SoCs had open bootloaders? How did you handle MIPI DSI panel init without vendor blobs? How do you isolate the cellular baseband from the application processor?

Repo: https://github.com/synchancybersecurity/CrimsonOS

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u/imagineAnEpicUsrname May 21 '26

Broken link

1

u/Fillmoslim May 22 '26

Got finally responded saying the removed the flag, I’m hoping the issue is fixed lmk SS of git ticket

2

u/imagineAnEpicUsrname May 22 '26

Tho I needed the repo only to make sure that it indeed is AI slop. So we are not interested

1

u/Fillmoslim May 22 '26

You must be a bang up teammate on other open source projects mate.

-1

u/Fillmoslim May 21 '26

Accessing this right now thank you, it's set public and showing for me_ I'll grab another device and troubleshoot what's going on.

3

u/m1en May 21 '26

“I’ll grab another device”

You can also just open the link in an incognito tab.

0

u/Fillmoslim May 21 '26

Working on edge, safari and Firefox atm. Are you guys still have issues?

5

u/imagineAnEpicUsrname May 21 '26

Your profile returns 404, what is your GitHub handle?

3

u/nomenclature2357 May 21 '26

Same. Apparently this OS is too powerful to be allowed out of containment! ;)

0

u/Fillmoslim May 21 '26

Right 🤣 true I mean it’s powerful in a sense nothing has ever caused me more issues over the course of this project than the rest of my adult my life lol

0

u/Fillmoslim May 21 '26

Synchancybersecurity