linux-kernel - Re: [PATCH] sh: Avoid using IRQ0 on SH3 and SH4

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Date:   Thu, 6 Jul 2023 17:39:23 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Sergey Shtylyov <s.shtylyov@....ru>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sh: Avoid using IRQ0 on SH3 and SH4

Hi Günter,

On Thu, Jul 6, 2023 at 4:03 PM Guenter Roeck <linux@...ck-us.net> wrote:
> On Thu, Jun 01, 2023 at 11:22:17PM +0300, Sergey Shtylyov wrote:
> > IRQ0 is no longer returned by platform_get_irq() and its ilk -- they now
> > return -EINVAL instead.  However, the kernel code supporting SH3/4-based
> > SoCs still maps the IRQ #s starting at 0 -- modify that code to start the
> > IRQ #s from 16 instead.
> >
> > The patch should mostly affect the AP-SH4A-3A/AP-SH4AD-0A boards as they
> > indeed are using IRQ0 for the SMSC911x compatible Ethernet chip.
> >
>
> Unfortunately it also affects all sh4 emulations in qemu, and results in
> boot stalls with those. There isn't a relevant log to attach because there
> is no error message - booting just stalls until the emulation is aborted.

Which sh4 platforms in particular?

I booted a kernel with this patch on rts7751r2d (QEMU) and landisk
(physical) two days ago.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

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