[U-Boot] [PATCH v2 5/6] ARM: Add a new arch + board for QEMU's 'virt' machine

[Peter Robinson]

>> Hi Tuomas,
>>
>> On Wed, Sep 20, 2017 at 4:18 AM, Tuomas Tynkkynen
>> <tuomas.tynkkynen at iki.fi> wrote:
>>>
>>> This board builds an U-Boot binary that is bootable with QEMU's 'virt'
>>> machine on ARM. The minimal QEMU command line is:
>>>
>>>      qemu-system-arm -machine virt,highmem=off -bios u-boot.bin
>>>
>>> (Note that the 'highmem=off' parameter to the 'virt' machine is required
>>> for
>>> PCI to work in U-Boot.) This command line enables the following:
>>>      - u-boot.bin loaded and executing in the emulated flash at address
>>> 0x0
>>>      - A generated device tree blob placed at the start of RAM
>>>      - A freely configurable amount of RAM, described by the DTB
>>>      - A PL011 serial port, discoverable via the DTB
>>>      - An ARMv7 architected timer
>>>      - PSCI for rebooting the system
>>>      - A generic ECAM-based PCI host controller, discoverable via the DTB
>>>
>>> Additionally, QEMU allows plugging a bunch of useful peripherals to the
>>> PCI bus.
>>> The following ones are supported by both U-Boot and Linux:
>>>
>>> - To add a Serial ATA disk via an Intel ICH9 AHCI controller, pass e.g.:
>>>      -drive if=none,file=disk.img,id=mydisk -device ich9-ahci,id=ahci
>>> -device ide-drive,drive=mydisk,bus=ahci.0
>>> - To add an Intel E1000 network adapter, pass e.g.:
>>>      -net nic,model=e1000 -net user
>>
>>
>> With this parameter I got:
>>
>> Warning: requested NIC (anonymous, model e1000) was not created (not
>> supported by this machine?)
>>
>> I am using QEMU v2.5.0. It's better to mention the minimum required
>> QEMU version in the commit message as well.
>>
>
> I primarily tested with 2.9.0, but I found out that it will work in 2.5.0 as
> well by changing the syntax to
>     -netdev user,id=net0 -device e1000,netdev=net0
> I will update the commit message accordingly.

I wonder how hard it would be to support virtio interfaces for
network/storage, that would provide a fast/standard interface.

Peter