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

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Date:   Thu, 6 Jul 2023 08:51:22 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
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

On 7/6/23 08:39, Geert Uytterhoeven wrote:
> 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.
> 

It is r2d. Example qemu command line:

qemu-system-sh4 -M r2d -kernel arch/sh/boot/zImage -no-reboot \
	-initrd rootfs.cpio -device rtl8139,netdev=net0 -netdev user,id=net0 \
	-append "rdinit=/sbin/init console=ttySC1,115200 earlycon=scif,mmio16,0xffe80000 noiotrap" \
	-serial null -serial stdio -nographic -monitor null

Example set of logs:

https://kerneltests.org/builders/qemu-sh-master/builds/5/steps/qemubuildcommand/logs/stdio

Guenter