RK3576 UEFI: Teaching EDK2 to Drive HDMI, USB, and eMMC
The goal was a real UEFI firmware on the RK3576: boot the standard chain but swap U-Boot proper for EDK2, so the board comes up to a proper UEFI environment (think ESXi-on-Arm, Windows, EBBR distros). The boot chain: BootROM → U-Boot SPL (idbloader) → TF-A BL31 → EDK2 UEFI (BL33 @ 0x40800000) SPL loads a FIT image — from SPI 0x60000 or SD sector 16384 — containing BL31 and EDK2. The unbreakable rule: U-Boot proper must never end up in that FIT. Half of the early bugs were exactly that leaking back in (u-boot.bin in the FIT, raw SPL with no RKNS header, FIT entries pointing at BL31 load addresses that didn’t match the ELF’s actual segments). Once the packaging was honest, the fun started: three peripherals, three completely different failure personalities. ...