+ struct target *target = get_current_target(CMD_CTX);
+ int retval = ERROR_OK;
+ enum reset_types jtag_reset_config = jtag_get_reset_config();
+
+ /* If the target has been unresponsive before, try to re-establish
+ * communication now - CPU is held in reset by DSU, DAP is working */
+ if (!target_was_examined(target))
+ target_examine_one(target);
+ target_poll(target);
+
+ /* In case of sysresetreq, debug retains state set in cortex_m_assert_reset()
+ * so we just release reset held by SMAP
+ *
+ * n_RESET (srst) clears the DP, so reenable debug and set vector catch here
+ *
+ * After vectreset SMAP release is not needed however makes no harm
+ */
+ if (target->reset_halt && (jtag_reset_config & RESET_HAS_SRST)) {
+ retval = target_write_u32(target, DCB_DHCSR, DBGKEY | C_HALT | C_DEBUGEN);
+ if (retval == ERROR_OK)
+ retval = target_write_u32(target, DCB_DEMCR,
+ TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET);
+ /* do not return on error here, releasing SMAP reset is more important */
+ }
+
+ int retval2 = target_write_u32(target, SMAP_SCR, SMAP_SCR_HCR);
+ if (retval2 != ERROR_OK)
+ return retval2;
+
+ return retval;