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doc: tfm: Documentation review fixes
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Fixes from documentation review

Signed-off-by: Seppo Takalo <[email protected]>

Co-authored-by: Pekka Niskanen <[email protected]>
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SeppoTakalo and peknis committed Jan 22, 2025
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Migrating from Secure Partition Manager to Trusted Firmware-M
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The Nordic Secure Partition Manager (SPM) was replaced with Trusted Firmware-M (TF-M) as the default trusted execution solution in the nRF Connect SDK 2.1.0.
This change was made to enhance the security features of the SDK by integrating the more widely adopted TF-M, which aligns with the Arm Platform Security Architecture (PSA).
The Nordic Secure Partition Manager (SPM) was replaced with Trusted Firmware-M (TF-M) as the default trusted execution solution in the |NCS| v2.1.0.
This change was made to enhance the security features of the SDK by integrating the more widely adopted TF-M that aligns with the Arm Platform Security Architecture (PSA).

The migration from SPM to TF-M requires changes in the application code and the partition configuration.
The interface to TF-M is different from the interface to SPM.
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