Table 11-4, External debug interface access permissions -9 – ARM Cortex R4F User Manual
Page 278
Debug
ARM DDI 0363E
Copyright © 2009 ARM Limited. All rights reserved.
11-9
ID013010
Non-Confidential, Unrestricted Access
OS Lock
The processor does not support OS Lock.
Note
•
These locks are set to their reset values only on reset of the debug logic, provided by
PRESETDBGn.
•
You must set the PADDRDBG31 input signal to 1 for accesses originated from the
external debugger for the Software Lock override feature to work.
Table 11-4 External debug interface access permissions
Registers
PADDRDBG31
Lock DRCR,
PRCR,
PRSR Other
Debug registers
LAR
Other registers
X
X
a
NPOSS
b
NPOSS
b
NPOSS
b
NPOSS
b
1
X
a
OK
c
OK
c
OK
c
OK
c
0
1
d
WI
e
WI
e
OK
c
WI
e
0
0
OK
c
OK
c
OK
c
OK
c
a. X indicates that the outcome does not depend on this condition.
b. Not possible. Accessing debug registers while the processor is powered down is not possible.
c. OK indicates that the access succeeds.
d. LSR[1] bit is set.
e. WI indicates that writes are ignored.