linux-kernel - Re: [RFC PULL] remove arch/h8300

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Date:   Mon, 4 Apr 2022 12:14:32 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        "moderated list:H8/300 ARCHITECTURE" 
        <uclinux-h8-devel@...ts.sourceforge.jp>,
        "open list:TENSILICA XTENSA PORT (xtensa)" 
        <linux-xtensa@...ux-xtensa.org>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Damien Le Moal <damien.lemoal@....com>,
        linux-riscv <linux-riscv@...ts.infradead.org>
Subject: Re: [RFC PULL] remove arch/h8300

On Mon, Apr 4, 2022 at 12:01 PM Arnd Bergmann <arnd@...db.de> wrote:
> On Mon, Apr 4, 2022 at 7:57 PM Max Filippov <jcmvbkbc@...il.com> wrote:
> > Please let me know if you observe any specific build/runtime issues.
>
> This is what I get:
>
> $ make ARCH=xtensa O=build/xtensa nommu_kc705_defconfig vmlinux V=1
> ....
> xtensa-linux-gcc-11.1.0 -DKCONFIG_SEED=
...
> /git/arm-soc/arch/xtensa/kernel/head.S: Assembler messages:
> /git/arm-soc/arch/xtensa/kernel/head.S:87: Error: invalid register
> 'atomctl' for 'wsr' instruction

Sure, one cannot use an arbitrary xtensa compiler for the kernel
build, the compiler configuration must match the core variant selected
in the linux configuration. Specifically, for the nommu_kc705_defconfig
the following compiler can be used:

https://github.com/foss-xtensa/toolchain/releases/download/2020.07/x86_64-2020.07-xtensa-de212-elf.tar.gz

If you build the toolchain yourself using crosstool-ng or buildroot they
accept the 'configuration overlay' parameter that does the compiler
customization.

Perhaps the documentation for this part is what needs to be improved.

> I think there were other errors in the past, but every time I tried
> it, the build failed for me.

-- 
Thanks.
-- Max