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Support multiple ROMs #3699

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Support multiple ROMs #3699

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29 changes: 19 additions & 10 deletions src/main/scala/devices/tilelink/BootROM.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,9 @@ case class BootROMParams(
address: BigInt = 0x10000,
size: Int = 0x10000,
hang: BigInt = 0x10040, // The hang parameter is used as the power-on reset vector
driveResetVector: Boolean = true,
appendDTB: Boolean = true,
name: String = "bootrom",
contentFileName: String)

class TLROM(val base: BigInt, val size: Int, contentsDelayed: => Seq[Byte], executable: Boolean = true, beatBytes: Int = 4,
Expand Down Expand Up @@ -63,7 +66,7 @@ class TLROM(val base: BigInt, val size: Int, contentsDelayed: => Seq[Byte], exec
}
}

case class BootROMLocated(loc: HierarchicalLocation) extends Field[Option[BootROMParams]](None)
case class BootROMLocated(loc: HierarchicalLocation) extends Field[Seq[BootROMParams]](Nil)

object BootROM {
/** BootROM.attach not only instantiates a TLROM and attaches it to the tilelink interconnect
Expand All @@ -73,27 +76,33 @@ object BootROM {
def attach(params: BootROMParams, subsystem: BaseSubsystem with HasHierarchicalElements with HasTileInputConstants, where: TLBusWrapperLocation)
(implicit p: Parameters): TLROM = {
val tlbus = subsystem.locateTLBusWrapper(where)
val bootROMDomainWrapper = tlbus.generateSynchronousDomain("BootROM").suggestName("bootrom_domain")
val bootROMDomainWrapper = tlbus.generateSynchronousDomain(params.name).suggestName(s"${params.name}_domain")

val bootROMResetVectorSourceNode = BundleBridgeSource[UInt]()
lazy val contents = {
val romdata = Files.readAllBytes(Paths.get(params.contentFileName))
val rom = ByteBuffer.wrap(romdata)
rom.array() ++ subsystem.dtb.contents
if (params.appendDTB) {
rom.array() ++ subsystem.dtb.contents
} else {
rom.array()
}
}

val bootrom = bootROMDomainWrapper {
LazyModule(new TLROM(params.address, params.size, contents, true, tlbus.beatBytes))
}

bootrom.node := tlbus.coupleTo("bootrom"){ TLFragmenter(tlbus, Some("BootROM")) := _ }
bootrom.node := tlbus.coupleTo(params.name){ TLFragmenter(tlbus, Some(params.name)) := _ }
// Drive the `subsystem` reset vector to the `hang` address of this Boot ROM.
subsystem.tileResetVectorNexusNode := bootROMResetVectorSourceNode
InModuleBody {
val reset_vector_source = bootROMResetVectorSourceNode.bundle
require(reset_vector_source.getWidth >= params.hang.bitLength,
s"BootROM defined with a reset vector (${params.hang})too large for physical address space (${reset_vector_source.getWidth})")
bootROMResetVectorSourceNode.bundle := params.hang.U
if (params.driveResetVector) {
subsystem.tileResetVectorNexusNode := bootROMResetVectorSourceNode
InModuleBody {
val reset_vector_source = bootROMResetVectorSourceNode.bundle
require(reset_vector_source.getWidth >= params.hang.bitLength,
s"BootROM defined with a reset vector (${params.hang})too large for physical address space (${reset_vector_source.getWidth})")
bootROMResetVectorSourceNode.bundle := params.hang.U
}
}
bootrom
}
Expand Down
2 changes: 1 addition & 1 deletion src/main/scala/subsystem/Configs.scala
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Expand Up @@ -54,7 +54,7 @@ class BaseSubsystemConfig extends Config ((site, here, up) => {
beatBytes = 8,
blockBytes = site(CacheBlockBytes))
// Additional device Parameters
case BootROMLocated(InSubsystem) => Some(BootROMParams(contentFileName = "./bootrom/bootrom.img"))
case BootROMLocated(InSubsystem) => Seq(BootROMParams(contentFileName = "./bootrom/bootrom.img"))
case HasTilesExternalResetVectorKey => false
case DebugModuleKey => Some(DefaultDebugModuleParams(64))
case CLINTKey => Some(CLINTParams())
Expand Down
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