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

On Apr 19, 2023, at 20:53, Geert Uytterhoeven <[email protected]> wrote:
> On Wed, Apr 19, 2023 at 12:25 PM John Paul Adrian Glaubitz
> <[email protected]> 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.
> 
> Looks like upstream gcc does not support -mj2, and thus the build fails
> with "unknown opcode" due to the use of "cas.l".
> Disabling CONFIG_SMP in j2_defconfig fixes/works around that.

Rich was mainlining the GCC patches out of tree.  Most of that can be found here:
https://github.com/richfelker/musl-cross-make/blob/master/patches/gcc-9.4.0/0007-j2.diff

We need to look a bit more at the code generator before we upstream the J-Core patches, since the CPU roadmap does extend SHcompact.

Cheers,
J.

> 
> Just checked with Arnd on IRC, who says opcodes/sh-opc.h was last updated
> in a meaningful way back in 2005...
> 
> 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