MegaBoomConfig & MediumBoomConfig Build fails due to require(nWays == 4) in src/main/scala/bpu/dense-btb.scala

[jhwangus]

I got the master branch at 7208cba and followed the step to build, all the way to verisim except for disabling the build for riscv-openocd.

build-rv64g.sh
#build_project riscv-openocd --prefix=$RISCV --enable-remote-bitbang --enable-jtag_vpi --disable-werror

$ cd verisim
$ make
$ make CONFIG=SmallBoomConfig

Above, both successful.

$ make CONFIG=MediumBoomConfig
$ make CONFIG=MegaBoomConfig

Both fail at dense-btb.scala:100

[error] Caused by: java.lang.IllegalArgumentException: requirement failed
[error] at scala.Predef$.require(Predef.scala:264)
[error] at boom.bpu.DenseBTB.(dense-btb.scala:100)
[error] at boom.bpu.BoomBTB$.$anonfun$apply$2(btb.scala:199)
[error] at chisel3.core.Module$.do_apply(Module.scala:49)

src/main/scala/bpu/dense-btb.scala: 100
require(nWays == 4)

Both configs have nWays=2 for BoomBTBParameters.

If I comment out this line then MediumBoomConfig can be built successfully. MegaBoomConfig will not report this error but stuck at a different place:

[error] Caused by: java.lang.IllegalArgumentException: requirement failed: Handling aliases in the ICache is buggy.
[error] at scala.Predef$.require(Predef.scala:277)
[error] at boom.common.HasBoomCoreParameters.$init$(parameters.scala:165)
[error] at boom.common.BoomBundle.(types.scala:12)