linux-kernel - Re: [solved] Yenta Cardbus allocation failure

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Date:	Tue, 19 Dec 2006 10:24:18 +0100
From:	"Markus Rechberger" <mrechberger@...il.com>
To:	"Chuck Ebbert" <76306.1226@...puserve.com>
Cc:	linux-kernel@...r.kernel.org,
	"Dominik Brodowski" <linux@...inikbrodowski.net>
Subject: Re: [solved] Yenta Cardbus allocation failure

On 12/19/06, Chuck Ebbert <76306.1226@...puserve.com> wrote:
> In-Reply-To: <d9def9db0612181612v657197ees925609243fc1ef65@...l.gmail.com>
>
> On Tue, 19 Dec 2006 01:12:07 +0100, Markus Rechberger wrote:
>
> > I went on with investigating that problem and found the problem,
> > though I'm not sure if that solution is acceptable..
> >
> > seems like the memory range gets preallocated in setup-bus.c, and
> > CARDBUS_MEM_SIZE defines that size.
> >
> > I changed
> > #define CARDBUS_MEM_SIZE        (32*1024*1024)
> > to
> > #define CARDBUS_MEM_SIZE        (48*1024*1024)
> >
> > and now the system is able to allocate the resources for the 3rd
> > pci/pcmcia function.
> >
> > Can anyone please have a closer look at it too? I think the whole
> > implementation isn't really good there..
> >
> > so this is the new output of iomem:
> > $ cat /proc/iomem
> > ...
> > 30000000-35ffffff : PCI Bus #02
> >   30000000-32ffffff : PCI CardBus #03
> > 36000000-360003ff : 0000:00:1f.1
> > 39000000-3bffffff : PCI CardBus #03
> >   39000000-39ffffff : 0000:03:00.0
> >   3a000000-3affffff : 0000:03:00.1
> >   3b000000-3bffffff : 0000:03:00.2 <- this one failed to allocate
> previously
>
> Wow, 3 regions of 16MB each!  Your change fixes this problem for you, but
> what if someone needs four such regions?
>

I documented everything I found about that issue (even the allocated
resources in window$)
http://linuxtv.org/v4lwiki/index.php/Talk:Pinnacle/310c#PCI_allocation_failed

that's why I wrote that the current implementation isn't nice..
I'm currently on the cx88 driver (which needs that memory region) to
get my Pinnacle Cardbus device work..
I won't get back to the PCI subsystem before I'm done with it.

Markus
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