From 7dad2e7096bd5d61d5a085a3c6d6d4041a35210e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ga=C3=ABtan=20Harter?= <gaetan.harter@fu-berlin.de>
Date: Wed, 13 Jun 2018 17:31:32 +0200
Subject: [PATCH] cortexm_common/ldscript: allow defining FW_ROM_SIZE
Allow defining a specific rom length to use for linking the firmware,
_fw_rom_length, instead of the default configuration to use the whole rom from
_rom_offset to the end.
* Add cortexm_common/Makefile.include FW_ROM_SIZE configuration
* Add an assertion that _fw_rom_length still respects _rom_length
---
cpu/cortexm_common/Makefile.include | 2 ++
cpu/cortexm_common/ldscripts/cortexm.ld | 4 +++-
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/cpu/cortexm_common/Makefile.include b/cpu/cortexm_common/Makefile.include
index 0cf0926b48..b1be7aff71 100644
--- a/cpu/cortexm_common/Makefile.include
+++ b/cpu/cortexm_common/Makefile.include
@@ -21,3 +21,5 @@ endif
# ROM_OFFSET: offset in rom to start linking, allows supporting a bootloader
LINKFLAGS += $(if $(ROM_OFFSET),$(LINKFLAGPREFIX)--defsym=_rom_offset=$(ROM_OFFSET))
+# FW_ROM_LEN: rom length to use for firmware linking. Allows linking only in a section of the rom.
+LINKFLAGS += $(if $(FW_ROM_LEN),$(LINKFLAGPREFIX)--defsym=_fw_rom_length=$(FW_ROM_LEN))
diff --git a/cpu/cortexm_common/ldscripts/cortexm.ld b/cpu/cortexm_common/ldscripts/cortexm.ld
index eb849a9602..1ce1024595 100644
--- a/cpu/cortexm_common/ldscripts/cortexm.ld
+++ b/cpu/cortexm_common/ldscripts/cortexm.ld
@@ -21,7 +21,9 @@
*/
_rom_offset = DEFINED( _rom_offset ) ? _rom_offset : 0x0;
-_fw_rom_length = _rom_length - _rom_offset;
+_fw_rom_length = DEFINED( _fw_rom_length ) ? _fw_rom_length : _rom_length - _rom_offset;
+
+ASSERT((_fw_rom_length <= _rom_length - _rom_offset), "Specified firmware size does not fit in ROM");
MEMORY
{
--
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