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TTBR0 has a specific format when using the Long-descriptor translation table format. TTBCR.EAE determines which format of the register is in use.
The Long-descriptor translation table format for TTBR0 is architecturally defined. See the Arm® Architecture Reference Manual Armv8, for Armv8-A architecture profile for a full description.
The following bit is specific to the implementation:
|0||CnP is not supported.|
|1||CnP is supported.|