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arm-bsp/doc: corstone1000: update A+M communication

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The OpenAMP is replaced by the RSE Communication Protocol and
the documentation had to by updated to reflect this change.

Signed-off-by: Bence Balogh <bence.balogh@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>
This commit is contained in:
Bence Balogh
2024-04-30 18:02:59 +02:00
committed by Jon Mason
parent 0e3fc3d87b
commit 013dded5a4
2 changed files with 8 additions and 5 deletions
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meta-arm-bsp/documentation/corstone1000/software-architecture.rst
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@@ -53,7 +53,7 @@ hardware for enhanced security. Communication with the Secure Encalve
is achieved using Message Handling Units (MHUs) and shared memory.
On system power on, the Secure Enclave boots first. Its software
comprises of a ROM code (TF-M BL1), Mcuboot BL2, and
TrustedFirmware-M(`TF-M`_) as runtime software. The software design on
TrustedFirmware-M(`TF-M`_) as runtime software. The software design on
Secure Enclave follows Firmware Framework for M class
processor (`FF-M`_) specification.
@@ -140,10 +140,13 @@ flow path for such calls.
The SE Proxy SP (Secure Enclave Proxy Secure Partition) is a proxy partition
managed by OPTEE which forwards such calls to the secure enclave. The
solution relies on OpenAMP which uses shared memory and MHU interrupts as
a doorbell for communication between two cores. Corstone-1000 implements
isolation level 2. Cortex-M0+ MPU (Memory Protection Unit) is used to implement
isolation level 2.
solution relies on the `RSE communication protocol
<https://tf-m-user-guide.trustedfirmware.org/platform/arm/rse/rse_comms.html>`_
which is a lightweight serialization of the psa_call() API. It can use shared
memory and MHU interrupts as a doorbell for communication between two cores
but currently the whole message is forwarded through the MHU channels in Corstone-1000.
Corstone-1000 implements isolation level 2. Cortex-M0+ MPU (Memory Protection
Unit) is used to implement isolation level 2.
For a user to define its own secure service, both the options of the host
secure world or secure encalve are available. It's a trade-off between