From: arnd@arndb•de (Arnd Bergmann)
To: linux-arm-kernel@lists•infradead.org
Subject: ARM Versatile defconfig PCI io out of range?
Date: Thu, 31 May 2012 09:32:50 +0000 [thread overview]
Message-ID: <201205310932.51140.arnd@arndb.de> (raw)
In-Reply-To: <4FC672BA.8070009@gmail.com>
On Wednesday 30 May 2012, Rob Herring wrote:
> On 05/30/2012 01:02 PM, Richard Maw wrote:
> >
> > We've tried to track down the problem, but we couldn't get much further
> > than finding out that the IO_SPACE_LIMIT in kernel/resource.c is 0xffff,
> > which is lower than the required 0x44000000.
> >
> > We're not sure whether this is a problem with it not being allocated
> > enough space, or that it is not being translated properly.
> >
> > Is this a known issue, I did a quick google for the "sym53c8xx
> > can't reserve io" error, but nothing turned up.
> > If not, does anyone have any pointers to how this could be fixed?
> >
>
> I believe this is the same issue:
>
> http://www.gossamer-threads.com/lists/linux/kernel/1543569
>
> In looking at various PCI platforms and for a qemu platform with PCI to
> test PCI changes, I had concluded (wrongly I guess) that Versatile PCI
> was broken. This patch which has never gone upstream also played a part
> in my conclusion:
>
> http://lists.infradead.org/pipermail/linux-arm-kernel/2010-July/021035.html
>
> The simple fix is to restore io.h for Versatile, but I'm looking for a
> better way.
It looks like it's a simple bug in pci.c, which puts the wrong thing into the
pcibios_min_io variable.
Does the below patch fix it?
Arnd
diff --git a/arch/arm/mach-versatile/pci.c b/arch/arm/mach-versatile/pci.c
index 4ae4fc8..aeb7b60 100644
--- a/arch/arm/mach-versatile/pci.c
+++ b/arch/arm/mach-versatile/pci.c
@@ -305,7 +305,7 @@ int __init pci_versatile_setup(int nr, struct pci_sys_data *sys)
void __init pci_versatile_preinit(void)
{
- pcibios_min_io = 0x44000000;
+ pcibios_min_io = 0x100;
pcibios_min_mem = 0x50000000;
__raw_writel(VERSATILE_PCI_MEM_BASE0 >> 28, PCI_IMAP0);
next prev parent reply other threads:[~2012-05-31 9:32 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-30 18:02 ARM Versatile defconfig PCI io out of range? Richard Maw
2012-05-30 19:19 ` Rob Herring
2012-05-31 9:32 ` Arnd Bergmann [this message]
2012-05-31 10:48 ` Richard Maw
2012-05-31 13:07 ` Rob Herring
2012-05-31 20:40 ` Arnd Bergmann
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