[U-Boot] [PATCH 12/12] riscv: Add QEMU virt board support

[Tuomas Tynkkynen]

Hi Bin,

On 09/04/2018 12:31 PM, Bin Meng wrote:
> Hi Lukas,
> 
> On Tue, Sep 4, 2018 at 5:39 AM Auer, Lukas
> <lukas.auer at aisec.fraunhofer.de> wrote:
>>
>> On Thu, 2018-08-30 at 00:54 -0700, Bin Meng wrote:
>>> This adds QEMU RISC-V 'virt' board target support, with the hope of
>>> helping people easily test U-Boot on RISC-V.
>>>
>>> The QEMU virt machine models a generic RISC-V virtual machine with
>>> support for the VirtIO standard networking and block storage devices.
>>> It has CLINT, PLIC, 16550A UART devices in addition to VirtIO and
>>> it also uses device-tree to pass configuration information to guest
>>> software. It implements RISC-V privileged architecture spec v1.10.
>>>
>>> Both 32-bit and 64-bit builds are supported. Support is pretty much
>>> preliminary, only booting to U-Boot shell with the UART driver on
>>> a single core. Booting Linux is not supported yet.
>>>
>>
>> For your information and to avoid duplicate work, I am working on a
>> patch set that improves RISC-V support in u-boot. I am currently able
>> to boot Linux on a multi-core setup in QEMU, but they are not quite
>> ready to submit yet.
>>
> 
> This is great! My next step is to work on virtio driver support in
> U-Boot as qemu-riscv virt machine has these devices but we don't have
> corresponding drivers in U-Boot. 
At some point I was working on porting the virtio stack from Linux to
U-Boot and IIRC got virtio-blk and virtio-net working on ARM. But other
things consumed my time and I never quite finished that work. Let me
know if you want to take a look.

- Tuomas