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To: linux-pci@vger.kernel.org
From: Peio <peio@azkarate.eu>
Subject: Re: PCI rescan : can't assign mem
Date: Wed, 2 Sep 2015 07:01:28 +0000 (UTC)
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Yinghai Lu <yinghai <at> kernel.org> writes:

> 
> On Tue, Sep 1, 2015 at 2:01 AM, Peio <peio <at> azkarate.eu> wrote:
> > Yinghai Lu <yinghai <at> kernel.org> writes:

> root bus resource:
> 
> [    0.277955] PCI host bridge to bus 0000:00
> [    0.277966] pci_bus 0000:00: root bus resource [bus 00-ff]
> [    0.277975] pci_bus 0000:00: root bus resource [io  0x0000-0x006f]
> [    0.277983] pci_bus 0000:00: root bus resource [io  0x0078-0x0cf7]
> [    0.277991] pci_bus 0000:00: root bus resource [io  0x0d00-0xffff]
> [    0.278000] pci_bus 0000:00: root bus resource [mem 0x000a0000-
0x000bffff]
> [    0.278008] pci_bus 0000:00: root bus resource [mem 0x000c0000-
0x000dffff]
> [    0.278016] pci_bus 0000:00: root bus resource [mem 0x000e0000-
0x000fffff]
> [    0.278025] pci_bus 0000:00: root bus resource [mem 0x80000000-
0x909ffffe]
> 
> and 00:02.0 use almost all
> 
> [    0.278221] pci 0000:00:02.0: reg 0x10: [mem 0x90000000-0x903fffff]
> [    0.278239] pci 0000:00:02.0: reg 0x18: [mem 0x80000000-0x8fffffff 
pref]
> 
> so we have no chance to allocate MMIO to 00:1c.0
> 

Any workaround?. 

Is the BIOS responsible for allocating memory resources in Linux?.
Perhaps changing some BIOS parameter ACPI related?.
If I change BIOS parameters I'll need a fresh install or the actual kernel 
reconigzes changes?.