linker: align __itcm_load_start / __dtcm_data_load_start linker symbols

Cleanup and preparation commit for linker script generator.

Zephyr linker scripts provides start and end symbols for each section,
and sometimes even size and LMA start symbols.

Generally, start and end symbols uses the following pattern, as:
Section name:             foo
Section start symbol:     __foo_start
Section end symbol:       __foo_end

However, this pattern is not followed consistently.
To allow for linker script generation and ensure consistent naming of
symbols then the following pattern is introduced consistently to allow
for cleaner linker script generation.
Section name:             foo
Section start symbol:     __foo_start
Section end symbol:       __foo_end
Section size symbol:      __foo_size
Section LMA start symbol: __foo_load_start

This commit aligns the symbols for __itcm_load_start and
__dtcm_data_load_start to other symbols and in such a way they follow
consistent pattern which allows for linker script and scatter file
generation.

The symbols are named according to the section name they describe.
Section names are itcm and dtcm.

The following symbols are aligned in this commit:
-  __itcm_rom_start      -> __itcm_load_start
-  __dtcm_data_rom_start -> __dtcm_data_load_start

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>

Author: tejlmand

include/arch/arm/aarch32/cortex_m/scripts/linker.ld

@@ -398,7 +398,7 @@ GROUP_START(ITCM)
 	} GROUP_LINK_IN(ITCM AT> ROMABLE_REGION)
 
 	__itcm_size = __itcm_end - __itcm_start;
-	__itcm_rom_start = LOADADDR(_ITCM_SECTION_NAME);
+	__itcm_load_start = LOADADDR(_ITCM_SECTION_NAME);
 
 GROUP_END(ITCM)
 #endif
@@ -433,7 +433,7 @@ GROUP_START(DTCM)
 
 	__dtcm_end = .;
 
-	__dtcm_data_rom_start = LOADADDR(_DTCM_DATA_SECTION_NAME);
+	__dtcm_data_load_start = LOADADDR(_DTCM_DATA_SECTION_NAME);
 
 GROUP_END(DTCM)
 #endif

include/linker/linker-defs.h

@@ -291,7 +291,7 @@ extern char __ccm_end[];
 extern char __itcm_start[];
 extern char __itcm_end[];
 extern char __itcm_size[];
-extern char __itcm_rom_start[];
+extern char __itcm_load_start[];
 #endif
 
 #if DT_NODE_HAS_STATUS(DT_CHOSEN(zephyr_dtcm), okay)
@@ -301,7 +301,7 @@ extern char __dtcm_bss_start[];
 extern char __dtcm_bss_end[];
 extern char __dtcm_noinit_start[];
 extern char __dtcm_noinit_end[];
-extern char __dtcm_data_rom_start[];
+extern char __dtcm_data_load_start[];
 extern char __dtcm_start[];
 extern char __dtcm_end[];
 #endif

kernel/xip.c

@@ -36,11 +36,11 @@ void z_data_copy(void)
 		 __ccm_data_end - __ccm_data_start);
 #endif
 #if DT_NODE_HAS_STATUS(DT_CHOSEN(zephyr_itcm), okay)
-	(void)memcpy(&__itcm_start, &__itcm_rom_start,
+	(void)memcpy(&__itcm_start, &__itcm_load_start,
 		 (uintptr_t) &__itcm_size);
 #endif
 #if DT_NODE_HAS_STATUS(DT_CHOSEN(zephyr_dtcm), okay)
-	(void)memcpy(&__dtcm_data_start, &__dtcm_data_rom_start,
+	(void)memcpy(&__dtcm_data_start, &__dtcm_data_load_start,
 		 __dtcm_data_end - __dtcm_data_start);
 #endif
 #ifdef CONFIG_CODE_DATA_RELOCATION