[Bug 1995080] Re: OpenSBI should emulate fence.tso for the D1 soc

[Heinrich Schuchardt]

** Changed in: opensbi (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1995080

Title:
  OpenSBI should emulate fence.tso for the D1 soc

Status in llvm-defaults package in Ubuntu:
  Invalid
Status in opensbi package in Ubuntu:
  Fix Released

Bug description:
  [ Impact ]

  As reported in https://bugs.launchpad.net/ubuntu/+source/llvm-
  defaults/+bug/1994071, clang triggers an illegal instruction trap and
  is killed after it tries to execute a fence.tso instruction. This is a
  known bug in the core of this soc, and a fix exists upstream which
  consists in emulating this instruction in opensbi.

  [ Test Plan ]

  Patch opensbi with both commits c919f684d95f ("lib: sbi_illegal_insn:
  Add emulation for fence.tso") and 51074432b233 ("lib:
  sbi_illegal_insn: Fix FENCE.TSO emulation infinite trap loop"),
  rebuild a u-boot-nezha package with this opensbi and install it on the
  nezha board. Finally reboot, and just execute the following command:

  $ clang --version

  Which should output the current clang version and not get killed.

  [ Where problems could occur ]

  This could break opensbi on all the RISC-V boards, even though the
  patches have been in upstream for a few months.

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