fix multi-tracker block device

src/main/scala/blkdev/Configs.scala

@@ -4,6 +4,18 @@ import config.{Parameters, Config}
 import example.DefaultExampleConfig
 import testchipip.{WithBlockDevice, WithNBlockDeviceTrackers}
 
+class WithSimBlockDevice extends Config((site, here, up) => {
+  case UseSimBlockDevice => true
+})
+
+class WithBlockDeviceModel extends Config((site, here, up) => {
+  case UseSimBlockDevice => false
+})
+
 class BlockDeviceConfig extends Config(
+  new WithSimBlockDevice ++
   new WithBlockDevice ++
   new DefaultExampleConfig)
+
+class WithTwoTrackers extends WithNBlockDeviceTrackers(2)
+class WithFourTrackers extends WithNBlockDeviceTrackers(4)

src/main/scala/blkdev/TestHarness.scala

@@ -2,10 +2,12 @@ package blkdev
 
 import diplomacy.LazyModule
 import chisel3._
-import config.Parameters
+import config.{Parameters, Field}
 import testchipip.GeneratorApp
 import example._
 
+case object UseSimBlockDevice extends Field[Boolean]
+
 class TestHarness(implicit p: Parameters) extends Module {
   val io = IO(new Bundle {
     val success = Output(Bool())
@@ -13,7 +15,10 @@ class TestHarness(implicit p: Parameters) extends Module {
 
   val dut = Module(LazyModule(new ExampleTopWithBlockDevice).module)
   dut.connectSimAXIMem()
-  dut.connectSimBlockDevice()
+  if (p(UseSimBlockDevice))
+    dut.connectSimBlockDevice()
+  else
+    dut.connectBlockDeviceModel()
   io.success := dut.connectSimSerial()
 }