CRC internal peripheral

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1. Article purpose[edit source]

The purpose of this article is to

briefly introduce the CRC peripheral and its main features
indicate the level of security supported by this hardware block
explain how each instance can be allocated to the three runtime contexts and linked to the corresponding software components
explain how to configure the CRC peripheral.

2. Peripheral overview[edit source]

The CRC peripheral is used to verify data transmission or storage integrity.

2.1. Features[edit source]

Refer to the STM32MP15 reference manuals for the complete list of features, and to the software components, introduced below, to see which features are implemented.

2.2. Security support[edit source]

CRC1 and CRC2 are non secure peripherals.

3. Peripheral usage and associated software[edit source]

3.1. Boot time[edit source]

CRC instances are not used at boot time.

3.2. Runtime[edit source]

3.2.1. Overview[edit source]

CRC instances can be allocated to:

the Arm^® Cortex^®-A7 non-secure for using in Linux^® with Linux Crypto framework

or

the Arm^® Cortex^®-M4 for using in STM32Cube with STM32Cube CRC driver

Chapter Peripheral assignment describes which peripheral instance can be assigned to which context.

3.2.2. Software frameworks[edit source]

Domain	Peripheral	Software components			Comment
Domain	Peripheral	OP-TEE	Linux	STM32Cube	Comment
Security	CRC		Linux Crypto framework	STM32Cube CRC driver

3.2.3. Peripheral configuration[edit source]

The configuration is applied by the firmware running in the context to which the peripheral is assigned. The configuration can be done alone via the STM32CubeMX tool for all internal peripherals, and then manually completed (particularly for external peripherals), according to the information given in the corresponding software framework article.

3.2.4. Peripheral assignment[edit source]

Internal peripherals

Check boxes illustrate the possible peripheral allocations supported by STM32 MPU Embedded Software:

☐ means that the peripheral can be assigned (☑) to the given runtime context.
✓ is used for system peripherals that cannot be unchecked because they are statically connected in the device.

Refer to How to assign an internal peripheral to a runtime context for more information on how to assign peripherals manually or via STM32CubeMX.
The present chapter describes STMicroelectronics recommendations or choice of implementation. Additional possiblities might be described in STM32MP15 reference manuals.

Domain	Peripheral	Runtime allocation				Comment
Domain	Peripheral	Instance	Cortex-A7 secure (OP-TEE)	Cortex-A7 non-secure (Linux)	Cortex-M4 (STM32Cube)	Comment
Security	CRC	CRC1		☐
Security	CRC	CRC2			☐

4. How to go further[edit source]

Not applicable.