Are you using up to date develop? There was a bug like this a while ago,
but it's been fixed on develop for a while as well.

Gabe

On Thu, Jan 21, 2021 at 6:35 PM Bohren, Jonathan via gem5-users <
gem5-users@gem5.org> wrote:

> We've been using the `VExpress_GEM5_V1` platform but it was failing on
> both `stable` and `develop` when adding an `IGbE_e1000` PCI device to the
> `makeArmSystem()` function in `FSConfig.py`. We've worked around it, but
> looking for the "right way" to add such a device.
>
> For reference, the change is shown here:
> ```
> diff --git a/configs/common/FSConfig.py b/configs/common/FSConfig.py
> index 6fd39a5aa..837d95982 100644
> --- a/configs/common/FSConfig.py
> +++ b/configs/common/FSConfig.py
> @@ -226,6 +226,8 @@ def makeArmSystem(mem_mode, machine_type, num_cpus=1,
> mdesc=None,
>      else:
>          self.pci_ide = IdeController(disks=disks)
>          pci_devices.append(self.pci_ide)
> +        self.realview.ethernet = IGbE_e1000()
> +        pci_devices.append(self.realview.ethernet)
>
>      self.mem_ranges = []
>      size_remain = long(Addr(mdesc.mem()))
> ```
>
> Specifically, the error that results during boot is regarding an address
> range collision once the device loads:
> ```
> fatal: system.iobus has two ports responding within range
> [0x80000000:0x80020000]:
>         system.realview.ethernet.pio
>         system.iobridge.cpu_side_port
> ```
>
> That `0x80000000:0x80020000` range corresponds exactly to the 128kB BAR0
> of the `IGbE` device.
>
> The recent change [1] makes it clear that this is an issue because the
> `IGbE_e1000` device uses a `PciMemBar`, which overlaps with the Realview's
> DRAM address range, while the pre-existing `IdeController` device only uses
> `PciIoBar` BARs, which don't. It's  possible to avoid the range collision
> by changing the Ethernet device's `PciMemBar` to a `PciIoBar` to keep it
> out of the DRAM range, but it's not yet clear if that workaround will cause
> other issues.
>
> What's the proper way to avoid this collision?
>
> [1] https://gem5-review.googlesource.com/c/public/gem5/+/35516
>
>  -jrb
>
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