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[fatalfeel]

this line will always repeat get same value, need speed up
retval = armv7a->post_debug_entry(target);

////////////////////////////////////////////////////////////////////////////////////////////////


//read cp15 control register once only for speed up
gedit /root/openocd-0.9.0/src/target/cortex_a.h
in struct cortex_a_common
after code
uint32_t didr;
add new
int first_read_cp15;

gedit /root/openocd-0.9.0/src/target/cortex_a.c
in function cortex_a_debug_entry(struct target *target)
if (armv7a->post_debug_entry)
{
retval = armv7a->post_debug_entry(target);
if (retval != ERROR_OK)
return retval;
}
//change to
if (armv7a->post_debug_entry && cortex_a->first_read_cp15)
{
cortex_a->first_read_cp15 = false;

retval = armv7a->post_debug_entry(target);
if (retval != ERROR_OK)
return retval;
}

in function cortex_a_target_create(struct target *target, Jim_Interp *interp)
after code
cortex_a->armv7a_common.is_armv7r = false;
add new
cortex_a->first_read_cp15 = true;

[fatalfeel]

new connection re read cp15 otherwise no need

in cortex_a_post_debug_entry add
//follow mmu, 0-AHB 1-APB
armv7a->memory_ap = armv7a->armv7a_mmu.mmu_enabled;
////////////////////////
in static int cortex_a_debug_entry(struct target *target)
change to
if (armv7a->post_debug_entry && target->cp15_switch )
{
target->cp15_switch = false;

retval = armv7a->post_debug_entry(target);
if (retval != ERROR_OK)
return retval;
}
////
in static int gdb_new_connection(struct connection *connection)
add
//by stone, new connect cp15 read
gdb_service->target->cp15_switch = true;

target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_ATTACH);

///////////
in struct target
add
bool cp15_switch; //by stone


each connection happen will detect cp15 work state