From 139707c5c032a4eab9815b7878c98aad6b29431f Mon Sep 17 00:00:00 2001
From: Uwe Bonnes <bon@elektron.ikp.physik.tu-darmstadt.de>
Date: Wed, 18 Jul 2018 23:20:26 +0200
Subject: [PATCH] cortexm/detach: Add a dummy transaction after cleaning DHCSR.

This replaces the seemingly superflous swdptap_seq_out() at
the end of adiv5_swdp_low_access() needed to continue after detach.
---
 src/target/cortexm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/target/cortexm.c b/src/target/cortexm.c
index 86e46fd..cbd769b 100644
--- a/src/target/cortexm.c
+++ b/src/target/cortexm.c
@@ -413,6 +413,8 @@ void cortexm_detach(target *t)
 
 	/* Disable debug */
 	target_mem_write32(t, CORTEXM_DHCSR, CORTEXM_DHCSR_DBGKEY);
+	/* Add some clock cycles to get the CPU running again.*/
+	target_mem_read32(t, 0);
 }
 
 enum { DB_DHCSR, DB_DCRSR, DB_DCRDR, DB_DEMCR };