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Re:Qualcomm – one of Arm’s biggest customers – starts a RISC... by rwmj on Sunday August 06, 2023 @11:32AM (#37023020)
OpenSBI is open source so hardly comparable to SMM. https://github.com/riscv-software-src/opensbi
Re:Qualcomm – one of Arm’s biggest customers – starts a RISC... by pgeorgi on Sunday August 06, 2023 @01:02PM (#37024068)
There's Open Source SMM as well (e.g. https://review.coreboot.org/plugins/gitiles/coreboot/+/HEAD/...) and it's still a pain.

"There's services outside the kernel's control that may or may not do what the kernel/userland/user expect because they can be independently updated, and, oh by the way, they're really powerful" is simply a pain to deal with.