Re: [PATCH] Fix J-core aic warning spam

Hi Rob,

On Thu, Apr 20, 2023 at 3:09 AM Rob Landley <[email protected]> wrote:
> On 4/19/23 05:25, John Paul Adrian Glaubitz wrote:
> > I just wanted to perform a test build of the J2 kernel, but I'm getting lots of error messages
> > from the assembler about unknown opcodes when trying to build j2_defconfig.
>
> J-core binary toolchain tarball:
>
> https://landley.net/toybox/downloads/binaries/toolchains/latest/sh2eb-linux-muslfdpic-cross.tar.xz
>
> Build script on top of Rich's musl-cross-make:
>
> https://landley.net/toybox/faq.html#cross2
>
> https://github.com/landley/toybox/blob/master/scripts/mcm-buildall.sh
>
> Fishing around in the for loop at the end of the script, the mcm-buildall.sh
> invocation for _just_ sh2eb would be:
>
>   ~/path/to/mcm-buildall.sh i686:: sh2eb:fdpic:--with-cpu=mj2
>
> Alas, this will build an i686 compiler (twice!) before building the sh2eb
> compiler, because the script makes portable toolchain tarballs which are
> statically linked on the host, and you can't do that with glibc because Ulrich
> Dr. Pepper was insane and his successors have been spineless, so it builds an
> i686 musl compiler first. (Could do x86_64, but didn't see a reason to make it
> less portable and use more memory? I should bench if it's noticeably faster...)

Good luck building Firefox with a 32-bit compiler ;-)

> The script builds an i686 host compiler internally (see
> BOOTSTRAP=i686-linux-musl near-ish the top), but gcc has this horrific two stage
> build thing it does where it builds and then rebuilds builds itself with itself,
> and that second i686 compiler would be the "builds with itself" one. (That's why
> it's at the start of the list in the for loop.) If you try to build anything
> ELSE with that compiler, autoconf winds up going "compiler can't create
> executables" because the stupid, it burns...
>
> Feel free to peel out simpler compiler toolchain builds if you've got a
> preference? The interesting bits for your purposes are probably:
>
> https://github.com/richfelker/musl-cross-make/blob/master/patches/gcc-9.4.0/0007-j2.diff
>
> https://github.com/richfelker/musl-cross-make/blob/master/patches/binutils-2.33.1/0001-j2.diff
>
> Jeff also has an sh2-elf toolchain build somewhere. That's more for bare metal,
> but I've confirmed it builds the kernel (as of 5.x somewhere anyway).

There's also [1], which is why it's good for Arnd to have the J-core
toolchain patches.

[1] https://mirrors.edge.kernel.org/pub/tools/crosstool/

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds