Porting OP-TEE to the RK3576
OP-TEE is the secure-world OS that runs at S-EL1, between TF-A and Linux. Getting it up on a new SoC is mostly plumbing — memory map, console, crypto, entropy — except every piece of that plumbing has a way to go silently wrong, and “silently” is the operative word here, because the first problem was literally silence. Target: Radxa Rock 4D (RK3576), firmware on SPI, kernel + an xtest initramfs off SD. The base platform support went up as OP-TEE PR #7821 — and it’s now merged into mainline OP-TEE. The OTP key-derivation half got split into its own follow-up (#7841), still in review; there’s a good reason it’s separate, and it’s below. ...