[Bug 247210] Risc-V in QEMU: missing interrupts and cc(1) failure

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247210

            Bug ID: 247210
           Summary: Risc-V in QEMU: missing interrupts and cc(1) failure
           Product: Base System
           Version: CURRENT
          Hardware: riscv
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: phk at FreeBSD.org

I tried following the wiki to setup a Risc-V system using -CURRENT under
Qemu-devel.

As far as things goes it does boot, and big hat tip for that.

Two issues however:

Two phenomena points to some timer interrupts not happening.

1) Ping(1) reports "inf ms":

    root at qemu:/tmp # ping 192.168.60.1
    PING 192.168.60.1 (192.168.60.1): 56 data bytes
    64 bytes from 192.168.60.1: icmp_seq=0 ttl=64 time=inf ms
    64 bytes from 192.168.60.1: icmp_seq=1 ttl=64 time=inf ms
    64 bytes from 192.168.60.1: icmp_seq=2 ttl=64 time=inf ms

2) Things run faster i CTRL-T is repeatedly pressed in the console.

I think this may also be why any attempt to ssh into the instance times out.


The other problem is that the installed compiler does not work, compiling the
canonical hello.c fails with:

    ld: error: a.c:(.text+0x0): relocation R_RISCV_ALIGN requires unimplemented
linker relaxation; recompile with -mno-relax
    cc: error: linker command failed with exit code 1 (use -v to see
invocation)

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