linker: arm: support CONFIG_SEGGER_RTT_SECTION_FIXED_ADDR for Cortex-M

When CONFIG_SEGGER_RTT_SECTION_FIXED_ADDR is defined, the ".rtt_buff_data" section contains RTT control block and buffers. The linker command/script file places this section at beginning of RAM to allow different programs (typically bootloader and application) to share this address and have seamless logging. Signed-off-by: Giancarlo Stasi <[email protected]>
zephyrproject-rtos · Jan 31, 2023 · 9c52b9e · 9c52b9e
1 parent a777cfc
commit 9c52b9e
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/include/zephyr/arch/arm/aarch32/cortex_m/scripts/linker.ld b/include/zephyr/arch/arm/aarch32/cortex_m/scripts/linker.ld
@@ -232,6 +232,16 @@ SECTIONS
 	. = ALIGN(_region_min_align);
 	_image_ram_start = .;
 
+#if defined(CONFIG_SEGGER_RTT_SECTION_FIXED_ADDR)
+	SECTION_DATA_PROLOGUE(_DTCM_SECTION_NAME,(NOLOAD),)
+	{
+	__rtt_buff_data_start = .;
+	*(.rtt_buff_data)
+	__rtt_buff_data_end = ALIGN(4);
+	} GROUP_DATA_LINK_IN(RAMABLE_REGION, RAMABLE_REGION)
+	__rtt_buff_data_size = __rtt_buff_data_end - __rtt_buff_data_start;
+#endif
+
 /* Located in generated directory. This file is populated by the
  * zephyr_linker_sources() Cmake function.
  */