Meeting Minutes 2022-03-30

Voting Members :

  • antmicro
  • google
  • ibm
  • oregonstateuniversity
  • vantosh
Total voting members : 5 - Quorum voting members : 3

Attendees :

  • toddrosedahl - ibm
  • toshaanbharvani - vantosh
  • timansell - google
  • michaelneuling - ibm
Voting member present : 3
This meeting has a voting member quorum.

LibreBMC SIG Meeting

Meeting date: 30 March 2022
Access link: https://zoom.us/j/91597478078
Meeting ID: 91597478078

Call to Order

Anti-trust Reminder

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AGENDA

Hardware Update

Bringup

  • AntMicro has all the HW it needs to do bring-up on the AC922.
    • They agreed to replicate the Aussie results
    • Mikey sent Todd a brief guide to where the code is, the steps, etc.
      • Looks good, Todd sent this on to Antmicro asking them to replicate the results and then use these instructions as a start of the README
      • Todd to see if Antmicro could port microwatt into litex natively

OCP DC-SCM 2.0 Working Group – Meets bi-weekly

  • Todd to run a call with Google and some other key players to discuss our common direction for the 3.0 standard. Still WIP. Trying to define the functions/areas that we need to go after. Lots of moving parts here in the industry.
  • Need a company that plans to implement a DC-SCM 2.0 card in order to get the standard approved.

Conference Report follow ups

  • Nothing New yet. Working on setting up meetings with microsoft and ASPEED near term.

Communication / Collaboration

  • Still seem to be issues with sending iCal meeting invites.

    • Yes, this is still an issue, we have some work-arounds planned
    • Seems to add to the calendar, but puts in limited information
    • Update?
  • Standing Reminder: Everyone should be posting things into the #librebmc-sig slack channel.

Gateware

Update?

Simulation

  • Antmicro to discuss Renode Recap this for this audience

    • Advantage over QEMU is the device availability in the model related to BMC functions. Temp sensors, power supplies, etc
    • Is not an RTL simulator, but would help for OpenBMC and Kernel driver debug
    • Many LiteX peripherals are supported
    • If a peripheral is not supported, it needs to be created
    • If we chose to use Renode, we need to create the list of needed peripherals vs available
    • Add Piotr Presentation link HERE
    • Todd to send note to Piotr with information on what we would like to do with Renode and where the links are to the code/etc. WIP
  • Progress on MicroWatt CPU replacement (OpenPower foundation funded?)

    • OPF is funding an FPGA optimized soft core
      • Target was “VexRISCV” resource usage and performance. Todd to schedule at a future meeting

Toolchain

Updates?

Software

Updates?

FPGA Usage Barriers

  • List of opens (potential barriers) for using FPGAs as BMCs Update here?
    • Cost – Munir to follow up
    • Soft Error Rates – Munir to follow up
      • Hard fails roughly the same as an ASIC
      • Looks like Xilinx SER FIT is reasonable (<200).
      • And detectable and fixable with an image reload
    • Performance? 8X slower than an ASPEED?
    • Image size

Workgroup Collaboration Tools

Community Involvement

  • How do we generate more activity/interest

    • Engage Universities
      • A Professor asked on linked in “How can me and my students contribute to this project”
      • What can we have them do right now?
        • Linux-on-Litex-VexRiscV => Linux-on-Linux-Microwatt (/cc Anton)
        • Port LPC to Renode (/cc Piotr)
        • Documentation (/cc all)
        • Todd reached out and the professor is interested. Todd will set up a special call next week. Available times/interest from the group? Help is needed to present the technical details
          • We need mentors to be contacts and help guide the students. No matter what we come up with for projects and no matter which method we use to get things done
        • Other ideas from Joel
          • Get a working litex configuration for microwatt
            • microwatt is an option in litex, but it is not complete. Need the interrupt controller workng and linux booting
          • Add CI so we know when litex breaks
          • We have an ecosystem of :micropython, u-boot, linux.
            • All work, but only in specific configs. Documenting and testing those configurations would be a good project.
          • Define a boot loader for microwatt
            • so that it will work across configurations (arty, orangecrab)
    • Offer badges/certificates
    • Offer Bounties
    • Major League Hacking Interships
      • Start end of May.
      • Need to sign up by end of March
      • Must have sponsors to guide students and hold office hours
      • We missed this window, but the next one starts in Sept and we will circle back on this in a month or so. We still need to think about detailed work tasks and who can be mentors
      • To use MLH, We need BoD (Board of Directors) approval
    • Need work items clearly identified and easily understood
  • To enable the community, we need to do the following:

    • Documentation – need build instructions, readme, etc

      • Need someone replicate the FPGA/OpenBMC load from scratch
      • Then document the process for others to follow
      • Toshaan said he would do this with help from Anton/Mikey
      • Todd to send him the DC-SCM board and interposer
      • Mikey to send him the ROT jumper
      • This plan is on hold. See if Antmicro can make progres here
    • Need small simple tasks identified

      • Can we, right now, carve out Lite-X peripherals to be ported?
    • Get the FPGA/DC-SCM card booting the AC922

    • Incorporate microwatt into lite-x natively.

    • Enable others

      • Need others to be able to re-create the results.
      • Build all pieces – Core, peripherals, OpenBMC,etc
      • Need official OpenBMC project and a makefile, bitbake/etc
      • Need the project broken down into manageable pieces
    • Include the firmware into the CI infrastructure

    • Add Full FPGA support (I2C, FSI, etc) More than just bit banging:
      a. PCIe
      b. I2C
      c. USB
      d. FSI
      e. GPIOs
      f. LPC
      g. Enet
      h. Refclock
      i. CLKIN
      j. JTAG
      k. DDR

    • Add Full OpenBMC support for the AC922

      • Fork the Witherspoon OpenBMC and run it
  • Other Ideas?

    • Need LiteX-Hub support and integration
    • Add more FPGA boards supports
    • Get it running on Raspbery PI
  • It was suggested that we should have a logo for libreBMC. Any thoughts from the team. Nice to have, but should not be a focus right now.

    • I did see an offer of help for a logo. I will follow up. TBD

Making Progress

Goals – Where do we want to be in 3mo, 6mo, 1 year – WIP

  • Tasks defined and project broken down
  • Able to generate a bitstream for an FPGA using fully open source toolchain.
  • Have RTL suitable for real production usage that has software support in the upstream OpenBMC project.
  • Someone seriously starting to do a real (non-development) LibreBMC deployment.
  • Fully functional Gateware and OpenBMC code stack for AC922
  • Determine the performance/size

Next Meeting

2022-04-14
14th of April 2022  @  16:00 UTC

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