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Arm Cortex-A55 Core Technical Reference Manual : TRCOSLAR, OS Lock Access Register

TRCOSLAR, OS Lock Access Register

The TRCOSLAR sets and clears the OS Lock, to lock out external debugger accesses to the ETM trace unit registers.

Bit field descriptions

Figure D8-48 TRCOSLAR bit assignments

RES0, [31:1]
OSLK, [0]

OS Lock key value:

0Unlock the OS Lock.
1Lock the OS Lock.

Bit fields and details not provided in this description are architecturally defined. See the Arm® Architecture Reference Manual Armv8, for Armv8-A architecture profile.

The TRCOSLAR can be accessed through the external debug interface, offset 0x300.

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