DT-free EDK2 on SBSA Reference Platform – Marcin Juszkiewicz

▤ Summary

But if you look deeper you will see DeviceTree hidden inside our chain of software components: It is very minimal one, providing us with only those information we need. On physical hardware firmware assumes some parts and asks EC for the rest of system information. When there is no info about processors or memory, it informs the user and shutdowns the system (such situation does not have a chance of happening but it works as an example). When QEMU is run with NUMA arguments then operating system gets whole memory and proper configuration information. If someone decide to write own firmware for SBSA Reference Platform (like port of U-Boot) then both DeviceTree and set of SMC calls will wait for them, ready to be used to gather hardware information.

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