scala - 如何使用外交将 AHB 端口连接到 DRAM Controller 设备

Question

如何从 Rocket-Chip 连接到外部 AHB 从端口(即内存 Controller 上的 AHB 端口)？我尝试在连接到 AXI4 从设备的其他几个示例之后对我的代码进行模式化，并且工作正常。但是，当我尝试实现相同的方法时，:= 在 IntelliJ 中以红色波浪线突出显示，这告诉我它无法连接这两种类型的节点，或者这些类不兼容用于绑定(bind)操作。我觉得我错过了关于这些节点类型的一些重要概念，这些概念与如何将这些设备粘合在一起有关。

trait CanHaveDdr4Ahb extends LazyModule { this: BaseSubsystem =>

  import freechips.rocketchip.subsystem.ExtMem

  override val module: CanHaveDdr4AhbImp

  val ahb_mem = p(ExtMem).map {
    case MemoryPortParams(mpp, nChan) => {
    val portName = "my_ahb"
    val device = new MemoryDevice
    val memAHBNode = AHBSlaveSinkNode(Seq.tabulate(nChan) { channel =>
      val base = AddressSet.misaligned(mpp.base, mpp.size)
      val filter = AddressSet(channel * mbus.blockBytes, ~((nChan - 1) * mbus.blockBytes))

      AHBSlavePortParameters(
        slaves = Seq(AHBSlaveParameters(
          address = List(AddressSet(mpp.base, mpp.size - 1)),
          resources = device.reg,
          regionType = RegionType.UNCACHED,
          executable = true,
          supportsWrite = TransferSizes(1, mbus.blockBytes),
          supportsRead = TransferSizes(1, mbus.blockBytes))),
        beatBytes = mpp.beatBytes)
    })

// TODO: Why can't I assign DRAMController output to this AHBSlaveSinkNode?
// AHBSlaveSinkNode := OutwardNodeHandle[D,U,E,B] { body }
    memAHBNode := mbus.toDRAMController(Some(portName)) { TLToAHB() }
    memAHBNode
  }
}

编辑: 好的，在将代码库工作回 Chipyard 并使用给出的解决方案后，即删除 AHBSlaveParameters 中 nodePath 和设备的分配，并将 := 绑定(bind)语句更改为:

memAHBNode := mbus.toDRAMController(Some(portName)) { TLToAHB() }

...相同类型的错误仍然存​​在，处理绑定(bind)操作如何尝试绑定(bind)到左侧的内容:

  OutwardNodeHandle[
    AHBMasterPortParameters, 
    AHBSlavePortParameters, 
    AHBEdgeParameters, 
    AHBMasterBundle] // <-- should be AHBSlaveBundle according to ahb/Nodes.scala

注意最后一行，它试图匹配一个

OutwardNodeHandle[D,U,E,AHBSlaveBundle]

在具有推断的 RHS 上

OutwardNodeHandle[D,U,E,AHBMasterBundle]

在作业的左手边。我不知道为什么编译器会这样输入。下面是我得到的错误输出。我也更新了上面的代码。

[error] /home/abryant/workspace/chipyard/generators/socta1_rtl/src/main/scala/devices/Ddr4Ahb.scala:62:16: overloaded method value := with alternatives:
[error]   [EY](h: freechips.rocketchip.diplomacy.OutwardNodeHandle[freechips.rocketchip.amba.ahb.AHBMasterPortParameters,freechips.rocketchip.amba.ahb.AHBSlavePortParameters,EY,freechips.rocketchip.amba.ahb.AHBSlaveBundle])(implicit p: freechips.rocketchip.config.Parameters, implicit sourceInfo: chisel3.internal.sourceinfo.SourceInfo)freechips.rocketchip.diplomacy.OutwardNodeHandle[freechips.rocketchip.amba.ahb.AHBMasterPortParameters,freechips.rocketchip.amba.ahb.AHBSlavePortParameters,freechips.rocketchip.amba.ahb.AHBEdgeParameters,freechips.rocketchip.amba.ahb.AHBSlaveBundle] <and>
[error]   [DX, UX, EX, BX <: Chisel.Data, EY](h: freechips.rocketchip.diplomacy.NodeHandle[DX,UX,EX,BX,freechips.rocketchip.amba.ahb.AHBMasterPortParameters,freechips.rocketchip.amba.ahb.AHBSlavePortParameters,EY,freechips.rocketchip.amba.ahb.AHBSlaveBundle])(implicit p: freechips.rocketchip.config.Parameters, implicit sourceInfo: chisel3.internal.sourceinfo.SourceInfo)freechips.rocketchip.diplomacy.NodeHandle[DX,UX,EX,BX,freechips.rocketchip.amba.ahb.AHBMasterPortParameters,freechips.rocketchip.amba.ahb.AHBSlavePortParameters,freechips.rocketchip.amba.ahb.AHBEdgeParameters,freechips.rocketchip.amba.ahb.AHBSlaveBundle]
[error]  cannot be applied to (freechips.rocketchip.diplomacy.OutwardNodeHandle[freechips.rocketchip.amba.ahb.AHBMasterPortParameters,freechips.rocketchip.amba.ahb.AHBSlavePortParameters,freechips.rocketchip.amba.ahb.AHBEdgeParameters,freechips.rocketchip.amba.ahb.AHBMasterBundle])
[error]     memAHBNode := mbus.toDRAMController(Some(portName)) {
[error]                ^

mbus.toDRAMController 传递给 := 的 OutwardNodeHandle 可从 AXI4Slave 类型继承，但不能从 AHBSlave 类型继承。

Answer 1

试试这个:

          memAHBNode := mbus.toDRAMController(Some(portName)) { TLToAHB() }

你把它搞得太复杂了。 :-)

您也不应该在 AHBSlavePortParamters 中设置 nodePath 或 device 字段。坦率地说，device 的存在让我感到震惊，应该尽快将其删除。