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privileged mode

ajay reddy1
Prodigy 200 points

Hi,

In TMS570 TRM I am seeign some registers/bits are only configurable in privileged mode. Pls let me know how to configure (write) such registers/bits.

Thanks & Regards,

Ajay.

 

  • 0
    TI__Intellectual 1325 points

    Hello Ajay,

    The mode referred to here is the CPU (Cortex-R4) operation mode. You find information about CPU operation modes in R4 TRM from ARM at the link below.

    http://infocenter.arm.com/help/topic/com.arm.doc.ddi0363e/DDI0363E_cortexr4_r1p3_trm.pdf

    Section 2.3 describes different operation modes.

    Modes other than User mode are considered Privileged Modes and device registers with Privilege access only can be accessed in these modes.

    Regards.

  • 0 in reply to Diwakar Bansal
    TI__Mastermind 22375 points

    Ajay,

    I would like to add the following.

    Out of reset, the CPU is in Supervisor mode (SVC) this is a privilege mode.
    Access to any peripheral registers (Read or Write) are possible.

    Usually in this mode, the device initialization is done.

    Once your device is configured, it is recommended to switch the CPU mode to User mode.
    User mode is the only mode without privilege.
    Access to protected register will cause a data abort only if you try to write to such protected registers. Read access will not cause any abort.

    Best Regards,

    Jean-Marc