jlaitine commented on code in PR #16512:
URL: https://github.com/apache/nuttx/pull/16512#discussion_r2142055199


##########
drivers/segger/segger.c:
##########
@@ -0,0 +1,38 @@
+/****************************************************************************
+ * drivers/segger/segger.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/spinlock.h>
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+spinlock_t g_segger_lock = SP_UNLOCKED;
+ptrdiff_t g_segger_offset = PTRDIFF_MAX;

Review Comment:
   If you wanted to actually use this variable for something, where is it 
supposed to be set? The default value of PTRDIFF_MAX wouldn't do anything good 
I suppose.
   
   I am a bit confused about the whole offset thingy, and just always kept it 
at 0 myself. Instead, I just define an uncached memory section in the linker 
script and set the CONFIG_SEGGER_RTT_SECTION to point in there (e.g. 
CONFIG_SEGGER_RTT_SECTION=".rtt"). 
   
   Could you add some info about how to use this config?



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