The firmware that boots your PC — the low-level code that runs before Windows or Linux ever appears — has long been a black box shipped by motherboard makers. On AMD's current desktop socket, that box just cracked open.
According to Tom's Hardware, the firmware company 3mdeb has released Dasharo v0.9.0 for the MSI B850-P WiFi motherboard, marking the first time open-source firmware has been introduced to the AM5 platform. The release brings Coreboot and openSIL to Zen 4 APUs on that board.
A quick translation: Coreboot is a long-running open-source project that replaces the proprietary BIOS/UEFI code most boards ship with, and openSIL is AMD's effort to open up the silicon-initialization layer that Coreboot needs to actually bring a modern AMD chip to life. Dasharo is 3mdeb's productized distribution built on that foundation. Getting all three working together on a shipping consumer motherboard is the milestone here — AM5 has been on the market for years without it.
Tom's Hardware frames the launch as specific rather than sweeping: one board, the MSI B850-P WiFi, and Zen 4 APUs. This is a first foothold, not a platform-wide replacement, and the version number — 0.9.0 — signals software that hasn't declared itself finished.
Why it matters: firmware sits beneath every security protection your operating system offers, so being able to read, audit, and modify it is the difference between trusting your PC's foundation and simply hoping it's sound.