sorear changed the topic of #riscv to: RISC-V instruction set architecture | https://riscv.org | Logs: https://libera.irclog.whitequark.org/riscv
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<geertu> I was a bit surprised to see riscv compat support show up in v5.19-rc1, as people said before it would not happen.
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<mmind00> geertu: looks like Guo was persistent enough :-)
<mmind00> geertu: though in the revisions I saw, I didn't see any real "won't happen" comments, so that must've been a while back?
<geertu> mmind00: almost 2 years ago, IIRC, when I started playing with RISC-V (incl. 32-bit vexriscv)
<geertu> At that time, RV32 Linux was considered a toy, and anything serious was supposed to run on RV64.
<geertu> And as there would never be serious RV32, there was no point in ever supporting compat mode on RV64 ;-)
<geertu> Well, I guess it goes by the same reasoning why we got powerpc64le and x32...
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<mps> is the Zifencei backported to gcc 11.2 or there is patch somewhere for it
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<davidlt> mps, Zifencei exist part of I in GCC 11.2 IIRC
<mps> davidlt: oh nice. how to enable it
<davidlt> mps, you don't need to do anything IIRC. It's already enabled.
<mps> in CFLAGS?
<mps> davidlt: build fails when trying to build grub
<davidlt> You need a newer binutils/gcc or to lower your ISA level to the old default
<dramforever_> You do nothing to have it enabled, so like, you mean GCC 11.2 doesn't recognize -march=..._zifencei ?
<davidlt> that is only recognized on a newer ISA spec, which was changed in GCC 12
<davidlt> with other toolchains or older default you don't need to specify it IIRC
<mps> davidlt: binutils-2.38 is now default on alpine
<davidlt> and GCC 12?
<mps> davidlt: 11.2
<davidlt> I assume GRUB build scripts should check first if GCC understands zifencei before using it
<mps> davidlt: it should but looks like it doesn't
<mps> uhm, maybe I'm blind, looks like someone fixed it on alpine
<mps> let me check
<davidlt> yeah, it should work with as it has AC_COMPILE_IFELSE
<mps> yes, patch is here https://tpaste.us/Vvle
<davidlt> yes, I think it was merged some time ago
<davidlt> but not in any released version of grub yet (ETA late this year)
<mps> yes
<davidlt> kernel, grub, u-boot, opensbi got very similar patches
<mps> sorry for annoyance
<davidlt> Alternatively you can just change default ISA back to 2.2 while compiling GCC
<mps> ah yes, I added similar patch for alpine u-boot, now I remember
<mps> not similar to grub, but fix
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