Linux 5.15 To Allow Reading From The Nintendo OTP Memory Area
The "nintendo-otp" driver was published by independent developers in working towards allowing this read-only memory area on at least the Nintendo Wii and Wii U consoles to be exposed by Linux. This special memory area contains encryption/decryption keys and signatures. The one-time programmable area contains just 128~1024 bytes for these keys and signatures. These per-console keys can be necessary for accessing peripherals and dealing with various attached storage.
This driver has been used with the downstream linux-wiiu kernel while now is in the process of being mainlined. For those interested, that downstream link also covers various details for those wanting to run Linux on the Nintendo Wii consoles.
With the mainline Linux 5.15 kernel it looks like all the pieces are ready for the (unofficial) Nintendo OTP driver. Currently the DeviceTree changes for the Wii and Wii U are part of POWER's "next-test" but there still is time to comfortably make it into the "next" branch with 5.15 not opening until the end of August or early September.