System Control
ARM DDI 0500D Copyright © 2013-2014 ARM. All rights reserved. 4-84
ID021414 Non-Confidential
Table 4-82 shows the MDCR_EL3 bit assignments.
Table 4-82 MDCR_EL3 bit assignments
Bits Name Function
[31:22] - Reserved,
RES0.
[21] EPMAD External debugger access to Performance Monitors registers disabled This disables access to these registers
by an external debugger: The possible values are:
0
Access to Performance Monitors registers from external debugger is permitted.
1
Access to Performance Monitors registers from external debugger is disabled, unless
overridden by authentication interface.
[20] EDAD External debugger access to breakpoint and watchpoint registers disabled. This disables access to these
registers by an external debugger: The possible values are:
0
Access to breakpoint and watchpoint registers from external debugger is permitted.
1
Access to breakpoint and watchpoint registers from external debugger is disabled, unless
overridden by authentication interface.
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