diff --git a/misoclib/gensoc/__init__.py b/misoclib/gensoc/__init__.py
index af09dfb9c..d89073da2 100644
--- a/misoclib/gensoc/__init__.py
+++ b/misoclib/gensoc/__init__.py
@@ -69,13 +69,13 @@ class GenSoC(Module):
 			"jtag_tap_spartan6.v", "lm32_itlb.v", "lm32_dtlb.v")
 		platform.add_sources(os.path.join("verilog", "lm32"), "lm32_config.v")
 
-	def register_rom(self, rom_wb_if):
+	def register_rom(self, rom_wb_if, bios_size=0x8000):
 		if self._rom_registered:
 			raise FinalizeError
 		self._rom_registered = True
 
 		self.add_wb_slave(lambda a: a[26:29] == 0, rom_wb_if)
-		self.add_cpu_memory_region("rom", self.cpu_reset_address, 0x8000) # 32KB for BIOS
+		self.add_cpu_memory_region("rom", self.cpu_reset_address, bios_size)
 
 	def add_wb_master(self, wbm):
 		if self.finalized:
@@ -114,6 +114,14 @@ class GenSoC(Module):
 			t += clk_period_ns/2
 		return ceil(t/clk_period_ns)
 
+class IntegratedBIOS:
+	def __init__(self, bios_size=0x8000):
+		self.submodules.rom = wishbone.SRAM(bios_size)
+		self.register_rom(self.rom.bus, bios_size)
+
+	def init_bios_memory(self, data):
+		self.rom.mem.init = data
+
 class SDRAMSoC(GenSoC):
 	csr_map = {
 		"dfii":					6,
diff --git a/targets/simple.py b/targets/simple.py
index 01e976c6f..7cefa6d96 100644
--- a/targets/simple.py
+++ b/targets/simple.py
@@ -1,25 +1,19 @@
 from migen.fhdl.std import *
-from migen.bus import wishbone
 
-from misoclib.gensoc import GenSoC
+from misoclib.gensoc import GenSoC, IntegratedBIOS
 
-class SimpleSoC(GenSoC):
+class SimpleSoC(GenSoC, IntegratedBIOS):
 	def __init__(self, platform):
 		GenSoC.__init__(self, platform,
 			clk_freq=32*1000000,
 			cpu_reset_address=0,
 			sram_size=4096)
+		IntegratedBIOS.__init__(self)
 
 		# We can't use reset_less as LM32 does require a reset signal
 		self.clock_domains.cd_sys = ClockDomain()
 		self.comb += self.cd_sys.clk.eq(platform.request("clk32"))
 		self.specials += Instance("FD", p_INIT=1, i_D=0, o_Q=self.cd_sys.rst, i_C=ClockSignal())
 
-		self.submodules.rom = wishbone.SRAM(32768)
-		self.register_rom(self.rom.bus)
-
-	def init_bios_memory(self, data):
-		self.rom.mem.init = data
-
 def get_default_subtarget(platform):
 	return SimpleSoC