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

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Date:   Sat, 30 Apr 2022 16:23:20 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        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>,
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        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
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Subject: Re: [PATCH v2 00/48] ARM: PXA multiplatform support

On Sat, Apr 30, 2022 at 3:32 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> On Sat, Apr 30, 2022 at 2:41 PM Guenter Roeck <linux@...ck-us.net> wrote:
> > On 4/30/22 01:04, Arnd Bergmann wrote:
> > > and concluded that it must have done this for a long time. In my own qemu
> > > instance, I see a crash from iWMMXt, but that works fine on your machine.
> > > OTOH, your failed instances all look like they either time out or
> > > failed to find a
> > > rootfs. I tried passing an MMC device as root, and that works here.
> > >
> >
> > Booting from mmc works for me as well. Booting from pcmcia worked before,
> > so I assume that there must be some regression.
>
> Ok, got it, and managed to reproduce the hang now. My "ARM: pxa/sa1100: move
> I/O space to PCI_IOBASE" patch managed to get it to the point of detecting
> the pcmcia device instead of crashing, so I assumed it was enough when it
> clearly was not. Before that patch, it still works, afterwards it hangs with
> "pata_pcmcia: probe of 0.0 failed with error -12" as mentioned above. I'll
> have another look.

Got it: as the PCMCIA bus on this machine is the only thing with an I/O space,
I assigned it port number range 0-0x1000, with an io_offset of 0, but this
was apparently unexpected and triggered this sanity check:

static int static_find_io(struct pcmcia_socket *s, unsigned int attr,
                        unsigned int *base, unsigned int num,
                        unsigned int align, struct resource **parent)
{
      if (!s->io_offset)
              return -EINVAL;
      ...
      return 0;
}

I moved the devices around now, giving zeus/viper I/O space an offset of
zero, and moving PCMCIA to offset 0x10000 and 0x11000 for the two slots,
which now works because the io_offset is nonzero. I've regenerated the
branches again, and confirmed the for-next branch still boots from pcmcia.

        Arnd