Re: [Qemu-devel] [PATCH for-3.2 v7 5/6] hw/riscv/sifive_u: Connect the Xilinx PCIe

[Alistair Francis]

On Wed, Nov 21, 2018 at 2:01 PM Logan Gunthorpe <address@hidden> wrote:
>
>
>
> On 2018-11-21 2:54 p.m., Alistair Francis wrote:
> > The last time I tested this it worked (although I might not have
> > tested interrupts) and now it doesn't. Nothing has changed in the
> > series, my guest software has changed though. I can see the root
> > complex, but no devices underneath it.
> >
> > Sorry for the confusion with the MicroSemi PCIe root complex.
> >
> > I think I'll just drop this patch. It doesn't work for 32-bit guests,
> > but I would like to model the hardware so I don't want to change the
> > addresses. We can revisit this in the future along with the gpex high
> > MMIO support and USB support.
>
> Yeah, I'm less concerned about all the board variant stuff as I am about
> having something actually work. I don't want to have to jump through any
> bbl hoops or anything to use it if it doesn't work out of the box. And
> you're right, getting the virt pci support upstream seems more important
> and this issue can be revisited later.
>
> On an slight tangent: what root device do you use with the sifive_u
> machine? I can't find any virtual hardware that works. If I had PCI I
> could use NVMe, but that's not working. And for this reason I've only
> been using the 'virt' device.

Yeah, it's a real pain. I had a go at adding the SD card [1] but never
got it fully working. Normally I just hack in the virtIO MMIO regions
and use those.

1: https://github.com/alistair23/qemu/tree/mainline/alistair/sifive_spi.next
    I just did a quick rebase, fully untested

Alistair

>
> Thanks,
>
> Logan