The EDDEVARCH characteristics are:
Identifies the programmers' model architecture of the external debug component.
Implementation of this register is OPTIONAL.
If FEAT_DoPD is implemented, this register is in the Core power domain.
If FEAT_DoPD is not implemented, this register is in the Debug power domain.
EDDEVARCH is a 32-bit register.
The EDDEVARCH bit assignments are:
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
ARCHITECT | PRESENT | REVISION | ARCHVER | ARCHPART |
Defines the architecture of the component. For debug, this is Arm Limited.
Bits [31:28] are the JEP106 continuation code, 0x4.
Bits [27:21] are the JEP106 ID code, 0x3B.
When set to 1, indicates that the DEVARCH is present.
This field is 1 in Armv8.
Defines the architecture revision. For architectures defined by Arm this is the minor revision.
For debug, the revision defined by Armv8-A is 0x0.
All other values are reserved.
Defines the architecture version of the component. This is the same value as ID_AA64DFR0_EL1.DebugVer and DBGDIDR.Version. The defined values of this field are:
ARCHVER | Meaning |
---|---|
0b0110 |
Armv8.0 Debug architecture. |
0b0111 |
Armv8.0 Debug architecture with Virtualization Host Extensions. |
0b1000 |
Armv8.2 Debug architecture. |
0b1001 |
Armv8.4 Debug architecture. |
FEAT_Debugv8p4 adds the functionality indicated by the value 0b1001. FEAT_Debugv8p2 adds the functionality indicated by the value 0b1000. If FEAT_VHE is not implemented, the only permitted value is 0b0110.
The fields ARCHVER and ARCHPART together form the field ARCHID, so that ARCHVER is ARCHID[15:12].
ARCHPART | Meaning |
---|---|
0xA15 |
The part number of the Armv8-A debug component. |
The fields ARCHVER and ARCHPART together form the field ARCHID, so that ARCHPART is ARCHID[11:0].
Component | Offset | Instance |
---|---|---|
Debug | 0xFBC | EDDEVARCH |
This interface is accessible as follows:
30/09/2020 15:06; ccead0cb9f089f9ceec50268e82aec9e71047211
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