Cortex-A15 Technical Reference Manual: 10.4.11. OS Lock Access Register

10.4.11. OS Lock Access Register

The DBGOSLAR characteristics are:

Purpose: Provides a lock for the debug registers.
Writing the key value to the DBGOSLAR also resets the internal counter for the OS Save or Restore operation. The OS Lock might also disable Software debug events.
Usage constraints: Use DBGOSLSR to check the current status of the lock, see OS Lock Status Register.
Configurations: Available in all configurations.
Attributes: See the register summary in Table 10.1.

Figure 10.13 shows the DBGOSLAR bit assignments.

Figure 10.13. DBGOSLAR bit assignments

Table 10.13 shows the DBGOSLAR bit assignments.

Table 10.13. DBGOSLAR bit assignments

Bits Name Function

[31:0]

OS Lock Access

Bits	Name	Function
[31:0]	OS Lock Access	Writing the key value `0xC5ACCE55` to this field locks the debug registers, and resets the internal counter for the OS Save or Restore operation. Writing any other value to this register unlocks the debug registers if they are locked. See the ARM Architecture Reference Manual for more information.

Writing the key value 0xC5ACCE55 to this field locks the debug registers, and resets the internal counter for the OS Save or Restore operation.

Writing any other value to this register unlocks the debug registers if they are locked. See the ARM Architecture Reference Manual for more information.

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