firmware: Update Makefiles, and linker scripts to support crt0-flash …

…startup code.
timvideos · Sep 22, 2018 · c0b6b1d · c0b6b1d
1 parent 9b7d4f8
commit c0b6b1d
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Showing 4 changed files with 10 additions and 8 deletions.
diff --git a/firmware/Makefile b/firmware/Makefile
@@ -66,8 +66,10 @@ include $(UIP_DIRECTORY)/Makefile.mk
 LDFLAGS += \
 
 ifeq ($(COPY_TO_MAIN_RAM), 1)
+CRT0 = ../libbase/crt0-$(CPU).o
 LINKER_LD = linker.ld
 else
+CRT0 = ../libbase/crt0-$(CPU)-flash.o
 LINKER_LD = linker-flash.ld
 endif
 
@@ -82,11 +84,11 @@ all: firmware.bin firmware.fbi
 
 firmware.elf: $(FIRMWARE_DIRECTORY)/$(LINKER_LD) $(OBJECTS)
 
-%.elf: ../libbase/crt0-$(CPU).o ../libbase/libbase-nofloat.a ../libcompiler_rt/libcompiler_rt.a ../uip/libuip.a
+%.elf: $(CRT0) ../libbase/libbase-nofloat.a ../libcompiler_rt/libcompiler_rt.a ../uip/libuip.a
 	$(LD) $(LDFLAGS) \
 		-T $(FIRMWARE_DIRECTORY)/$(LINKER_LD) \
 		-N -o $@ \
-                ../libbase/crt0-$(CPU).o \
+                $(CRT0) \
                 $(OBJECTS) \
                 -L../libbase \
 		-lbase-nofloat \

diff --git a/firmware/linker-flash.ld b/firmware/linker-flash.ld
@@ -28,15 +28,15 @@ SECTIONS
 		_erodata = .;
 	} > user_flash
 
-	.data :
+	.data : AT (ADDR(.rodata) + SIZEOF (.rodata))
 	{
 		. = ALIGN(4);
 		_fdata = .;
 		*(.data .data.* .gnu.linkonce.d.*)
 		*(.data1)
 		_gp = ALIGN(16);
 		*(.sdata .sdata.* .gnu.linkonce.s.*)
-		_edata = .;
+		_edata = ALIGN(16); /* Make sure _edata is >= _gp. */
 	} > sram
 
 	.bss :

diff --git a/firmware/stub/Makefile b/firmware/stub/Makefile
@@ -31,11 +31,11 @@ all: firmware.bin firmware.fbi
 
 firmware.elf: $(STUB_DIRECTORY)/$(LINKER_LD) $(OBJECTS)
 
-%.elf: ../libbase/crt0-$(CPU).o ../libbase/libbase-nofloat.a ../libcompiler_rt/libcompiler_rt.a
+%.elf: ../libbase/crt0-$(CPU)-flash.o ../libbase/libbase-nofloat.a ../libcompiler_rt/libcompiler_rt.a
 	$(LD) $(LDFLAGS) \
 		-T $(STUB_DIRECTORY)/$(LINKER_LD) \
 		-N -o $@ \
-        ../libbase/crt0-$(CPU).o \
+        ../libbase/crt0-$(CPU)-flash.o \
         $(OBJECTS) \
         -L../libbase \
 		-lbase-nofloat \

diff --git a/firmware/stub/linker.ld b/firmware/stub/linker.ld
@@ -28,15 +28,15 @@ SECTIONS
 		_erodata = .;
 	} > user_flash
 
-	.data :
+	.data : AT (ADDR(.rodata) + SIZEOF (.rodata))
 	{
 		. = ALIGN(4);
 		_fdata = .;
 		*(.data .data.* .gnu.linkonce.d.*)
 		*(.data1)
 		_gp = ALIGN(16);
 		*(.sdata .sdata.* .gnu.linkonce.s.*)
-		_edata = .;
+		_edata = ALIGN(16); /* Make sure _edata is >= _gp. */
 	} > sram
 
 	.bss :