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Replay Protected Memory Block "RPMB" Subsystem Submitted For Linux 6.12
The MMC updates for the Linux 6.12 kernel include the introduction of a new kernel subsystem for Replay Protected Memory Block (RPMB) drivers.
The RPMB block in eMMC can be used for matters like storing DRM protection keys, OEM security keys, and other information that can't -- for whatever legal or security reasons -- can't be stored via normal storage. The TEE/OPTEE (Trusted Execution Environment) subsystem is the initial user of this RPMB support. The patches have gone through a number of revisions in recent months and the code is ready with the OP-TEE driver integration.
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