BOOMv3 TODOs

[jerryz123]

I think once we get the following features completed, we can mark a new version of BOOM.

• RVC Support RVC Support #141
• PMPs supported [dcache] Fork NBDCache, re-enable PMPs #123
• Integer-only [core] Added integer only BOOM config #107
• CircleCI CircleCI Integration #140
• Fix 4-cycle load use (Bug with 4-cycle loaduse #153)
• Configurable RV32 (Allow RV32 BOOM Configs #164)
• Re-enable HPMs
• Unified issue queues for 1-wide machine (Support BOOMv1 configs again)
• RVWMO memory consistency model
• PnR head in ROB
• Re-enable RAS (Fix RAS  #148)
• RoCC Support (Boom with RoCC #103)
• Verify TAGE BP
• Fix ma_fetch vaddr generation in ROB (Failing ma_fetch test #62)

[abejgonzalez]

I would also recommend having HPM's working, TAGE verified and working, and bumped rocket-chip added to the list.

[jerryz123]

Do we have documentation of the RAS bug anywhere? What is the broken behavior?

How difficult would it be to re-enable HPMs. I see a bunch of commented out code, but I don't know how much work it would be to re-enable these.

Also lets just use the same rocket-chip as whatever FireSim is using. I don't want to bump past the version they have.

[abejgonzalez]

I don't think HPM's would be that hard. Theoretically, they should already be enabled. It was just when I was trying to read them that I was getting garbage out. As for the RAS, it is just that is it commented out with older signal names. So the port would be to uncomment then fix signal names and verify. As for FireChip, that sounds good with me.

[heiner-bauer]

After reading chapter 12 of the documentation I have several questions regarding HPMs / HPEs:

• which events does BOOM track ?
  I have no clue of chisel but the code in exu/core.scala

  riscv-boom/src/main/scala/exu/core.scala

  Line 221 in f4968d7

  new freechips.rocketchip.rocket.EventSet((mask, hits) => (mask & hits).orR, Seq(

  does not look like it matches the number and ordering of the SiFive U54 events
• how many independent counters does BOOM support ?
• do you happen to have some kind of library to use these counters (configuring and reading these CSRs is kind of fiddly) ?

[abejgonzalez]

@heiner-bauer Moved the conversation to a new issue thread to keep this thread on "ToDos"