get RV32 working

Makefrag

@@ -32,7 +32,7 @@ $(FIRRTL_JAR): $(call lookup_scala_srcs, $(ROCKETCHIP_DIR)/firrtl/src/main/scala
 
 build_dir=$(sim_dir)/generated-src
 
-bootrom_img = $(base_dir)/bootrom/bootrom.img
+bootrom_img = $(base_dir)/bootrom/bootrom.rv64.img $(base_dir)/bootrom/bootrom.rv32.img
 
 CHISEL_ARGS ?=
 

bootrom/Makefile

@@ -1,7 +1,9 @@
-bootrom_img = bootrom.img
-bootrom_dump = bootrom.dump
+bootrom_img = bootrom.rv64.img bootrom.rv32.img
+bootrom_dump = bootrom.rv64.dump bootrom.rv32.dump
 
-GCC=riscv64-unknown-elf-gcc -march=rv64imafd
+GCC=riscv64-unknown-elf-gcc
+CFLAGS_RV64=-mabi=lp64 -march=rv64ima
+CFLAGS_RV32=-mabi=ilp32 -march=rv32ima
 OBJCOPY=riscv64-unknown-elf-objcopy
 OBJDUMP=riscv64-unknown-elf-objdump
 
@@ -12,8 +14,11 @@ dump: $(bootrom_dump)
 %.img: %.elf
 	$(OBJCOPY) -O binary --change-addresses=-0x10000 $< $@
 
-%.elf: %.S linker.ld
-	$(GCC) -Tlinker.ld $< -nostdlib -static -o $@
+%.rv32.elf: %.S linker.ld
+	$(GCC) $(CFLAGS_RV32) -Tlinker.ld $< -nostdlib -static -o $@
+
+%.rv64.elf: %.S linker.ld
+	$(GCC) $(CFLAGS_RV64) -Tlinker.ld $< -nostdlib -static -o $@
 
 %.dump: %.elf
 	$(OBJDUMP) -d $< > $@

src/main/scala/example/Configs.scala

@@ -2,10 +2,17 @@ package example
 
 import chisel3._
 import freechips.rocketchip.config.{Parameters, Config}
-import freechips.rocketchip.coreplex.{WithRoccExample, WithNMemoryChannels, WithNBigCores}
+import freechips.rocketchip.coreplex.{WithRoccExample, WithNMemoryChannels, WithNBigCores, WithRV32}
+import freechips.rocketchip.devices.tilelink.BootROMParams
 import freechips.rocketchip.diplomacy.LazyModule
+import freechips.rocketchip.tile.XLen
 import testchipip._
 
+class WithBootROM extends Config((site, here, up) => {
+  case BootROMParams => BootROMParams(
+    contentFileName = s"./bootrom/bootrom.rv${site(XLen)}.img")
+})
+
 class WithExampleTop extends Config((site, here, up) => {
   case BuildTop => (clock: Clock, reset: Bool, p: Parameters) =>
     Module(LazyModule(new ExampleTop()(p)).module)
@@ -33,6 +40,7 @@ class WithSimBlockDevice extends Config((site, here, up) => {
 })
 
 class BaseExampleConfig extends Config(
+  new WithBootROM ++
   new freechips.rocketchip.system.DefaultConfig)
 
 class DefaultExampleConfig extends Config(
@@ -58,3 +66,6 @@ class WithFourMemChannels extends WithNMemoryChannels(4)
 class DualCoreConfig extends Config(
   // Core gets tacked onto existing list
   new WithNBigCores(1) ++ new DefaultExampleConfig)
+
+class RV32ExampleConfig extends Config(
+  new WithRV32 ++ new DefaultExampleConfig)