soc/integration/builder: Allow linking in external software packages.

litex/soc/integration/builder.py

@@ -46,9 +46,6 @@ soc_software_packages = [
     "libliteeth",
     "liblitesdcard",
     "liblitesata",
-
-    # BIOS.
-    "bios"
 ]
 
 # Builder ------------------------------------------------------------------------------------------
@@ -105,16 +102,25 @@ class Builder:
         # Documentation
         self.generate_doc = generate_doc
 
-        # List software packages.
+        # List software packages and libraries.
         self.software_packages = []
+        self.software_libraries = []
+
         for name in soc_software_packages:
             self.add_software_package(name)
 
+            if name == "libbase":
+                name += "-nofloat"
+            self.add_software_library(name)
+
     def add_software_package(self, name, src_dir=None):
         if src_dir is None:
             src_dir = os.path.join(soc_directory, "software", name)
         self.software_packages.append((name, src_dir))
 
+    def add_software_library(self, name):
+        self.software_libraries.append(name)
+
     def _generate_includes(self):
         # Generate Include/Generated directories.
         _create_dir(self.include_dir)
@@ -123,12 +129,18 @@ class Builder:
         # Generate BIOS files when the SoC uses it.
         with_bios = self.soc.cpu_type not in [None, "zynq7000"]
         if with_bios:
+            self.add_software_package("bios")
 
             # Generate Variables to variables.mak.
             variables_contents = []
             def define(k, v):
                 variables_contents.append("{}={}".format(k, _makefile_escape(v)))
 
+            # Define packages and libraries.
+            define("PACKAGES", " ".join(name for name, src_dir in self.software_packages))
+            define("PACKAGE_DIRS", " ".join(src_dir for name, src_dir in self.software_packages))
+            define("LIBS", " ".join(self.software_libraries))
+
             # Define the CPU variables.
             for k, v in export.get_cpu_mak(self.soc.cpu, self.compile_software):
                 define(k, v)

litex/soc/software/bios/Makefile

@@ -54,28 +54,17 @@ endif
 
 bios.elf: $(BIOS_DIRECTORY)/linker.ld $(OBJECTS)
 
+vpath %.a $(PACKAGES:%=../%)
 
-%.elf: ../libbase/crt0.o \
+%.elf: ../libbase/crt0.o $(LIBS:%=%.a)
-	../libcompiler_rt/libcompiler_rt.a \
-	../libbase/libbase-nofloat.a \
-	../liblitedram/liblitedram.a \
-	../libliteeth/libliteeth.a \
-	../liblitespi/liblitespi.a \
-	../libfatfs/libfatfs.a \
-	../liblitesdcard/liblitesdcard.a \
-	../liblitesata/liblitesata.a
 	$(CC) $(LDFLAGS) -T $(BIOS_DIRECTORY)/linker.ld -N -o $@ \
 		../libbase/crt0.o \
 		$(OBJECTS) \
-		-L../libcompiler_rt \
+		$(PACKAGES:%=-L../%) \
-		-L../libbase \
+		-Wl,--whole-archive \
-		-L../liblitedram \
+		-Wl,--gc-sections \
-		-L../libliteeth \
+		$(LIBS:lib%=-l%) \
-		-L../liblitespi \
+
-		-L../libfatfs \
-		-L../liblitesdcard \
-		-L../liblitesata \
-		-llitedram -lliteeth -llitespi -lfatfs -llitesdcard -llitesata -lbase-nofloat -lcompiler_rt
 
 ifneq ($(OS),Windows_NT)
 	chmod -x $@