From cf79d8f57747cb41fa9756263fe14470197c5c86 Mon Sep 17 00:00:00 2001
From: Vegard Storheil Eriksen <zyp@jvnv.net>
Date: Thu, 7 Jan 2021 11:26:54 +0100
Subject: build: Generate linker script.

---
 SConscript                          | 3 +++
 build/scons_tools/tool_firmware.py  | 2 +-
 build/scons_tools/tool_selectmcu.py | 4 +++-
 ld_scripts/SConscript               | 3 +++
 ld_scripts/generated.ld.j2          | 7 +++++++
 platforms/stm32/f4.yaml             | 2 --
 6 files changed, 17 insertions(+), 4 deletions(-)
 create mode 100644 ld_scripts/SConscript
 create mode 100644 ld_scripts/generated.ld.j2

diff --git a/SConscript b/SConscript
index bc20764..8613407 100644
--- a/SConscript
+++ b/SConscript
@@ -1,6 +1,9 @@
 # Don't call this file explicitly, it is called implicitly by the build rules.
 
 Import('env')
+Export('env')
+
+env.SConscript('ld_scripts/SConscript')
 
 env.Append(
 	LIB_SOURCES = Glob('*.cpp') + Glob('*/*.cpp'),
diff --git a/build/scons_tools/tool_firmware.py b/build/scons_tools/tool_firmware.py
index b1ead1f..c7e8f34 100644
--- a/build/scons_tools/tool_firmware.py
+++ b/build/scons_tools/tool_firmware.py
@@ -3,7 +3,7 @@ from SCons.Script import *
 def Firmware(env, target, sources, **kwargs):
 	objects = [env.Object(f) for f in Flatten([sources, env['LIB_SOURCES']])]
 	firmware = env.Program(target, objects, **kwargs)
-	#env.Depends(firmware, env['LINK_SCRIPT']) # TODO
+	env.Depends(firmware, '${LAKS_PATH}/ld_scripts/${LINK_SCRIPT}')
 	return firmware
 
 def exists():
diff --git a/build/scons_tools/tool_selectmcu.py b/build/scons_tools/tool_selectmcu.py
index da4b38d..8d7029f 100644
--- a/build/scons_tools/tool_selectmcu.py
+++ b/build/scons_tools/tool_selectmcu.py
@@ -13,6 +13,8 @@ def SelectMCU(env, mcu, variant_dir = None):
 	)
 	
 	env.Replace(
+		PLATFORM_SPEC = spec,
+
 		CC     = '${TOOLCHAIN}gcc',
 		CXX    = '${TOOLCHAIN}g++',
 		AS     = '${TOOLCHAIN}gcc',
@@ -32,7 +34,7 @@ def SelectMCU(env, mcu, variant_dir = None):
 	)
 
 	env.Replace(
-		LINK_SCRIPT = spec.get('ld_script'),
+		LINK_SCRIPT = 'generated.ld',
 	)
 
 	env.Append(
diff --git a/ld_scripts/SConscript b/ld_scripts/SConscript
new file mode 100644
index 0000000..da5c551
--- /dev/null
+++ b/ld_scripts/SConscript
@@ -0,0 +1,3 @@
+Import('env')
+
+env.Jinja2('generated.ld', 'generated.ld.j2', mem = env['PLATFORM_SPEC']['mem'])
diff --git a/ld_scripts/generated.ld.j2 b/ld_scripts/generated.ld.j2
new file mode 100644
index 0000000..40a198a
--- /dev/null
+++ b/ld_scripts/generated.ld.j2
@@ -0,0 +1,7 @@
+MEMORY {
+    {% for name, m in mem.items() %}
+        {{ name }} ({{ 'rx' if name == 'flash' else 'rwx' }}) : org = {{ m.origin }}, len = {{ m.size }}
+    {% endfor %}
+}
+
+INCLUDE "arm_flash_ram.ld"
diff --git a/platforms/stm32/f4.yaml b/platforms/stm32/f4.yaml
index 0d336ce..a2b28f7 100644
--- a/platforms/stm32/f4.yaml
+++ b/platforms/stm32/f4.yaml
@@ -4,7 +4,6 @@
     flash:
       origin: 0x08000000
       size: 512k
-  ld_script: stm32_f4_e.ld
 
 - match:
     mem: g
@@ -12,7 +11,6 @@
     flash:
       origin: 0x08000000
       size: 1M
-  ld_script: stm32_f4_g.ld
 
 - mem:
     ram:
-- 
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