Features for test chips

generators/chipyard/src/main/scala/DigitalTop.scala

@@ -13,6 +13,8 @@ import freechips.rocketchip.devices.tilelink._
 
 // DOC include start: DigitalTop
 class DigitalTop(implicit p: Parameters) extends ChipyardSystem
+  with testchipip.CanHavePeripheryCustomBootPin // Enables optional custom boot pin
+  with testchipip.HasPeripheryBootAddrReg // Use programmable boot address register
   with testchipip.CanHaveTraceIO // Enables optionally adding trace IO
   with testchipip.CanHaveBackingScratchpad // Enables optionally adding a backing scratchpad
   with testchipip.CanHavePeripheryBlockDevice // Enables optionally adding the block device

generators/chipyard/src/main/scala/HarnessBinders.scala

@@ -321,3 +321,9 @@ class WithSimDromajoBridge extends ComposeHarnessBinder({
     ports.map { p => p.traces.map(tileTrace => SimDromajoBridge(tileTrace)(system.p)) }
   }
 })
+
+class WithTieOffCustomBootPin extends OverrideHarnessBinder({
+  (system: CanHavePeripheryCustomBootPin, th: HasHarnessSignalReferences, ports: Seq[Bool]) => {
+    ports.foreach(_ := false.B)
+  }
+})

generators/chipyard/src/main/scala/IOBinders.scala

@@ -372,6 +372,13 @@ class WithTraceIOPunchthrough extends OverrideIOBinder({
   }
 })
 
+class WithCustomBootPin extends OverrideIOBinder({
+  (system: CanHavePeripheryCustomBootPin) => system.custom_boot_pin.map({ p =>
+    val sys = system.asInstanceOf[BaseSubsystem]
+    val (port, cells) = IOCell.generateIOFromSignal(p.getWrappedValue, "custom_boot", sys.p(IOCellKey), abstractResetAsAsync = true)
+    (Seq(port), cells)
+  }).getOrElse((Nil, Nil))
+})
 
 class WithDontTouchPorts extends OverrideIOBinder({
   (system: DontTouch) => system.dontTouchPorts(); (Nil, Nil)

generators/chipyard/src/main/scala/config/AbstractConfig.scala

@@ -21,6 +21,7 @@ class AbstractConfig extends Config(
   new chipyard.harness.WithSimAXIMMIO ++                        // add SimAXIMem for axi4 mmio port, if enabled
   new chipyard.harness.WithTieOffInterrupts ++                  // tie-off interrupt ports, if present
   new chipyard.harness.WithTieOffL2FBusAXI ++                   // tie-off external AXI4 master, if present
+  new chipyard.harness.WithTieOffCustomBootPin ++
 
   // The IOBinders instantiate ChipTop IOs to match desired digital IOs
   // IOCells are generated for "Chip-like" IOs, while simulation-only IOs are directly punched through
@@ -37,6 +38,7 @@ class AbstractConfig extends Config(
   new chipyard.iobinders.WithSPIIOCells ++
   new chipyard.iobinders.WithTraceIOPunchthrough ++
   new chipyard.iobinders.WithExtInterruptIOCells ++
+  new chipyard.iobinders.WithCustomBootPin ++
 
   new testchipip.WithDefaultSerialTL ++                          // use serialized tilelink port to external serialadapter/harnessRAM
   new chipyard.config.WithBootROM ++                             // use default bootrom