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MIPS24KEC vs MIPS24KC: has anyone tried to tune the Omega2 FW Buildroot?

  • I'm fiddling with the onion firmware buildroot, trying to solve some issues I believe are due to usage of musl as libc. I'll come back to this in a future post.

    Anyway, I've noticed that MT7688 is in fact a MIPS24KEC, not a MIPS24KC, with the E meaning it contains the DSPr1 ASE from MIPS. Therefore, we should be able to compile with the following flags in gcc:

    Target Optimizations:
    -Os -pipe -mno-branch-likely -march=mips32r2 -mtune=24kec -mdsp -mfix-24k

    Extra Optimizations
    -fno-caller-saves -fno-plt -ftree-vectorize

    I'm curious if anyone has tried these options, and if there are caveats. Code compiled with 24kec (and the dsp instructions) should run and link fine with code compiled for 24kc, but just broadcasting this out there.

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