linux-kernel - Re: [PATCH v2 00/48] ARM: PXA multiplatform support

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Date:   Sat, 23 Apr 2022 21:55:03 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Robert Jarzmik <robert.jarzmik@...e.fr>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Arnd Bergmann <arnd@...db.de>, Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Philipp Zabel <philipp.zabel@...il.com>,
        Lubomir Rintel <lkundrak@...sk>,
        Paul Parsons <lost.distance@...oo.com>,
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        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
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Subject: Re: [PATCH v2 00/48] ARM: PXA multiplatform support

On Sat, Apr 23, 2022 at 1:41 AM Guenter Roeck <linux@...ck-us.net> wrote:
>
> On Sat, Apr 23, 2022 at 12:04:31AM +0200, Arnd Bergmann wrote:
> > On Fri, Apr 22, 2022 at 10:55 PM Guenter Roeck <linux@...ck-us.net> wrote:
> > > On 4/22/22 12:16, Arnd Bergmann wrote:
> > > > On Fri, Apr 22, 2022 at 7:05 PM Guenter Roeck <linux@...ck-us.net> wrote:
> > > >
> > > > Which machine did you hit this on? Is this on hardware or in qemu?
> > > >
> > > qemu, as always. borzoi, spitz, terrier, tosa, z2, and sx1 fail.
> > > Also, I just noticed that the failure is not always the same.
> > > z2 fails to boot from initrd, and sx1 fails to boot completely.
> >
> > That's a lot of machines failing, I hope at least we got the same bugs more
> > than once here.
> >
> > For the I/O space, I found now that PXA was not using the standard
> > virtual I/O address yet, but instead used a NULL-based offset.
> >
> > I'm not entirely happy with this patch, but this is an outline of what
> > I think we need to fix that: https://pastebin.com/3nVgQsEw
> > This one is probably incomplete, at least it breaks sa1100 for now,
> > and it adds a bogus CONFIG_PCI dependency. I'm also not sure
> > in what way the last patch in the series triggers it, rather than the
> > one that removed mach/io.h.
> >
> > I had sx1 booting in qemu at least, with the omap1 multiplatform series only.
> > If you have a custom config for this one, make sure you get the right
> > DEBUG_LL address.
> >
> > > I'll do another round of bisects.
> >
>
> Here is the bisect for the sx1 boot failure.

Odd, I can't reproduce this at all. Do you get any console output at
all for this?

Is this the plain omap1_defconfig, or something else?

One thing I keep having to apply myself is this snippet:

diff --git a/arch/arm/mm/proc-arm925.S b/arch/arm/mm/proc-arm925.S
index 0bfad62ea858..87c695703580 100644
--- a/arch/arm/mm/proc-arm925.S
+++ b/arch/arm/mm/proc-arm925.S
@@ -441,7 +441,6 @@ __arm925_setup:

 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
        mov     r0, #4                          @ disable write-back
on caches explicitly
-       mcr     p15, 7, r0, c15, c0, 0
 #endif

        adr     r5, arm925_crval

I don't remember what the story is behind this, but I can't actually manage
to boot omap1_defconfig on qemu with the instruction intact.

       Arnd