EDACR, External Debug Auxiliary Control Register
The EDACR characteristics are:
Allows implementations to support IMPLEMENTATION DEFINED controls.
It is IMPLEMENTATION DEFINED whether EDACR is implemented in the Core power domain or in the Debug power domain. RW fields in this register reset to architecturally UNKNOWN values, and:
- The register is not affected by a Warm reset.
- If the register is implemented in the Core power domain the reset values apply on a Cold reset, and the register is not affected by an External debug reset.
- If the register is implemented in the Debug power domain the reset values apply on an External debug reset, and the register is not affected by a Cold reset.
Changing this register from its reset value causes IMPLEMENTATION DEFINED behavior, including possible deviation from the architecturally-defined behavior.
If the EDACR contains any control bits that must be preserved over power down, then these bits must be accessible by the external debug interface when the OS Lock is locked, OSLSR_EL1.OSLK == 1, and when the Core is powered off.
EDACR is a 32-bit register.
The EDACR bit assignments are:
IMPLEMENTATION DEFINED, bits [31:0]
This field resets to an architecturally UNKNOWN value.
Accessing the EDACR
EDACR can be accessed through the external debug interface:
This interface is accessible as follows:
- When IsCorePowered(), !DoubleLockStatus(), !OSLockStatus() and SoftwareLockStatus() access to this register is RO.
- When IsCorePowered(), !DoubleLockStatus(), !OSLockStatus() and !SoftwareLockStatus() access to this register is RW.
- Otherwise access to this register is IMPDEF.