return ERROR_OK;
}
+/*
+ Some -S targets (ARM966E-S in the STR912 isn't affected, ARM926EJ-S
+ in the LPC3180 and AT91SAM9260 is affected) completely stop the JTAG clock
+ while the core is held in reset(SRST). It isn't possible to program the halt
+ condition once reset was asserted, hence a hook that allows the target to set
+ up its reset-halt condition prior to asserting reset.
+*/
+
int arm7_9_assert_reset(target_t *target)
{
+ armv4_5_common_t *armv4_5 = target->arch_info;
+ arm7_9_common_t *arm7_9 = armv4_5->arch_info;
LOG_DEBUG("target->state: %s", target_state_strings[target->state]);
if (!(jtag_reset_config & RESET_HAS_SRST))
return ERROR_FAIL;
}
- /* we can't know what state the target is in as we might e.g.
- * be resetting after a power dropout, so we need to issue a tms/srst
- */
-
- /* assert SRST and TRST */
- /* system would get ouf sync if we didn't reset test-logic, too */
- jtag_add_reset(1, 1);
-
- jtag_add_sleep(5000);
+ if ((target->reset_mode == RESET_HALT) || (target->reset_mode == RESET_INIT))
+ {
+ reg_t *dbg_ctrl = &arm7_9->eice_cache->reg_list[EICE_DBG_CTRL];
+
+ /* program EmbeddedICE Debug Control Register to deassert DBGRQ
+ * i.e. resume.
+ */
+ buf_set_u32(dbg_ctrl->value, EICE_DBG_CONTROL_DBGRQ, 1, 0);
+ embeddedice_store_reg(dbg_ctrl);
+
+ /*
+ * Some targets do not support communication while SRST is asserted. We need to
+ * set up the reset vector catch here.
+ *
+ * If TRST is asserted, then these settings will be reset anyway, so setting them
+ * here is harmless.
+ */
+ if (arm7_9->has_vector_catch)
+ {
+ /* program vector catch register to catch reset vector */
+ embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_VEC_CATCH], 0x1);
+ }
+ else
+ {
+ /* program watchpoint unit to match on reset vector address */
+ embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK], 0x3);
+ embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK], 0x0);
+ embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], 0x100);
+ embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK], 0xf7);
+ }
+ }
/* here we should issue a srst only, but we may have to assert trst as well */
if (jtag_reset_config & RESET_SRST_PULLS_TRST)
target->state = TARGET_RESET;
jtag_add_sleep(50000);
- /* at this point we TRST *may* be deasserted */
- arm7_9_prepare_reset_halt(target);
-
-
armv4_5_invalidate_core_regs(target);
return ERROR_OK;
return ERROR_OK;
}
-int arm7_9_prepare_reset_halt(target_t *target)
-{
- if ((target->reset_mode!=RESET_HALT)&&(target->reset_mode!=RESET_INIT))
- {
- return ERROR_OK;
- }
- return arm7_9_halt(target);
-}
-
int arm7_9_halt(target_t *target)
{
armv4_5_common_t *armv4_5 = target->arch_info;
if (target->state == TARGET_HALTED)
{
- LOG_WARNING("target was already halted");
+ LOG_DEBUG("target was already halted");
return ERROR_OK;
}
LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
return ERROR_TARGET_FAILURE;
}
+ else
+ {
+ /* we came here in a reset_halt or reset_init sequence
+ * debug entry was already prepared in arm7_9_prepare_reset_halt()
+ */
+ target->debug_reason = DBG_REASON_DBGRQ;
+
+ return ERROR_OK;
+ }
}
if (arm7_9->use_dbgrq)